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This article contains comprehensive information about laser cutting and laser drilling. Read further to learn more about:
Laser cutting is a material-cutting method that uses an intensely focused, coherent stream of light to cut through metals, paper, wood, and acrylics. It is a subtractive process that removes material during the cutting process using vaporization, melting, chemical ablation, or controlled crack propagation. Laser optics controlled by Computer Numerical Control (CNC) can drill holes as small as 5 microns (µ). The process does not produce residual stresses on materials, making it possible to cut fragile and brittle materials.
Laser drilling uses several methods, including single-shot, percussion, trepanning, and helical. Single-shot and percussion laser drilling produce holes at a higher rate than the other processes. Trepanning and helical drilling, produce more accurate, higher-quality holes.
Laser cutting is a non-contact process where cutting is completed without making contact with the cut material. It can shape high-strength, brittle materials such as diamond tools and refractory ceramics. The first production laser cutting was introduced in and was used to drill holes in diamond dies. It was later used for cutting high strength alloys and metals such as titanium for aerospace applications. Its range of applications covers the cutting of polymers, semiconductors, gems, and metallic alloys.
Laser stands for "light amplification by stimulated emission of radiation". Aside from the cutting applications of lasers, they are used for joining, heat treating, inspection, and free form manufacturing. Laser cutting differs from other laser machining processes since it requires higher power densities but shorter interaction times.
Lasers are generated by a high-intensity light source inside a reflective laser cavity, that contains a laser rod that generates the radiation. The light source stimulates the laser rod's atoms as they absorb wavelengths of light from the light source. Light is composed of small bundles of photons that strike the lasting media atoms energizes them. The photon's energized atoms, give off two more photons with the same wavelength, direction, and phase, called stimulated emission. The new photons stimulate other energized atoms producing more photons, causing a cascade of excitations.
The photons move perpendicular to parallel mirrors located on the ends of the laser rod but stay within the laser rod. One mirror is transmissive, enabling the partial escape of light from the cavity. This escaping stream of coherent, monochromatic light is the laser beam used to cut the material. Another set of mirrors or fiber-optics direct light into a lens that focuses the light into the material.
The three main types of lasers used for cutting, are CO&#;, Nd-YAG (Neodymium Yttrium-Aluminum-Garnet) lasers, and fiber-optic lasers. They differ in the materials used to generate the laser beam.
Fiber-optic lasers are the newest and most popular types of lasers because that they can generate different wavelengths for more precise cutting. They use an optical fiber cable made of silica glass to guide the light. The laser beam produced by fiber-optic lasers is more precise because it is straighter and smaller.
Fiber lasers vary according to their laser source mixture, including ytterbium-doped, thulium-doped, and erbium-doped. The choice of mixture is dependent on the application where they will be used and their wavelengths. For example, erbium generates light in the nm to nm range. Ytterbium produces light with wavelengths of nm, nm, and nm.
The two modes of fiber optic lasers are single and multiple with the core diameter of single-mode lasers being between 8 µ to 9 µ while multiple mode lasers have diameters of 50 µ up to 100 µ. Of the two modes, single-mode lasers are more efficient and produce a better quality beam of light.
Fiber-optic lasers are classified as solid-state since their power source is silica glass mixed with rare earth elements. This is contrary to CO&#; lasers that use gas to create their power. An additional difference between the two forms of power is their wavelengths, with fiber-optic lasers producing wavelengths of 780 nm up to nm while CO&#; lasers have wavelengths of nm up to 10,600 nm.
This type has a gas discharge lasing medium filled with 10 &#; 20% carbon dioxide, 10 &#; 20% nitrogen, traces of hydrogen and xenon, and helium for balance. Instead of light, laser pumping is done by discharging an electrical current. When the electrical discharge passes through the lasing medium, nitrogen molecules become excited, bringing it to a higher energy level. Unlike what was described before, these excited nitrogen molecules do not lose their energy by photon emission. Rather, it transfers its vibrational mode energy to CO&#; molecules. This process continues until most of the CO&#; molecules are in a metastable state. The CO&#; molecules then emit infrared light at either 10.6 µm or 9.6 µm, which brings them to lower energy levels. The resonating mirrors are designed to reflect the emitted photons on those wavelengths. One mirror is a partially reflecting mirror allowing the release of the infrared beam that is used for cutting the material. After releasing infrared light, the CO&#; molecules return to the ground state by transferring their remaining energy to the doped helium atoms. The cold helium atoms then become hot which are cooled by the cooling system of the laser. The efficiency of a CO&#; laser is around 30% which is higher than other lasers.
Unlike the CO&#; laser, this type is a solid-state laser that uses a synthetic crystal as a lasing medium. The most popular is the YAG (Y3Al5O12) crystal doped with 1% ionized neodymium (Nd3+). The Nd ions replace the Y ions in the crystal structure in this crystal. The length of the rod is about 4 inches (10 cm) with a diameter of 2.4 to 3.5 inches (6 to 9 cm). The ends of the YAG rod are polished and coated by highly reflective materials acting as the resonator system.
Laser pumping is achieved by krypton flashlamps or laser diodes. This laser pumping excites the Nd ions into higher energy levels. After a short while, the excited Nd ions move into a lower, more stable state, without emitting photons. This process goes on until the medium is populated with excited Nd ions. From its metastable state, the Nd ions release infrared light with a wavelength of nm.
It is known that as light travels through a fiber-optic, it remains inside with minimal energy losses. This makes fiber-optics more stable than other types that require them to be aligned accurately.
Laser cutting uses assist gasses, such as compressed air, nitrogen, or argon, injected at the nozzle to supplement the cutting process. Assist gasses help start the cutting by using an exothermic reaction, a chemical that releases energy through the use of light or heat. The use of assist gasses helps in a more effective transference of heat than can be created by the beam alone. In cutting metals, assist gasses help remove the molten metal.
The previous chapter discussed the different types of lasers according to how the laser beam is formed using different types of lasing pumps and lasing media. Next will be the methods of laser cutting&#;how the small bits of materials are removed to produce a cut. There are four main methods of laser cutting: sublimating, melting, reacting, and thermal stress fracturing.
Sublimation is a type of phase change from a solid state to a gaseous state, with no intermediate liquid phase. This is the same process of how dry ice turns into a vapor without becoming a liquid. The material quickly absorbs energy in which there is no chance for melting to occur. The same principle is applied to laser cutting, wherein a high amount of energy is imparted into the material in a relatively short time that causes direct phase change of the material from solid to gaseous states, with as little melting as possible.
The cut begins by creating an initial keyhole or kerf. In the kerf, there is more absorptivity which causes the material to vaporize more quickly. This sudden vaporization creates a material vapor with high pressure that further erodes the walls of the kerf while ejecting materials from the cut. This deepens and enlarges the hole or cut made.
This process is suitable for cutting plastics, textiles, wood, paper, and foam, which requires only small amounts of energy to be vaporized.
In comparison with sublimation, melting requires less energy to achieve. The energy required is about a tenth of the sublimating laser cuts. In this process, the laser beam heats the material, which causes it to melt. As the material melts, a jet of gas from the coaxial nozzle with the laser beam expels the material from the cut. The assist gasses used are inert or non-reacting (e.g., helium, argon, and nitrogen), which only aids the cutting through mechanical means.
Because of its low energy requirement is used for cutting non-oxidizing or active metals such as stainless steel, titanium, and aluminum alloys.
In this process, a reactive gas is used to generate more heat by reacting with the material. The process begins by melting the material with a laser beam. As the material melts, a stream of oxygen gas comes out of the coaxial nozzle, reacting with the molten metal. The reaction between the metal and oxygen is an exothermic process which means heat is released. This heat assists in the melting of the material, which is about 60% of the total energy required to cut the material. The molten metal oxides are expelled by the pressure of the oxygen jet.
Aside from the lower energy required from the laser beam, cutting speeds using reactive gasses are faster than laser cutting with inert gasses. However, since this process relies on a chemical reaction, the molten metal oxide that is not expelled by the oxygen jet forms along the edge of the cut. This produces low-quality cuts than using inert gasses.
This process is used to cut thick carbon steels, titanium steels, and other easily oxidized metals.
This process involves introducing a small kerf at depths of about one-third the thickness of the material using a laser. The laser is then used to induce localized stresses. This is achieved by heating a small spot which creates compressive forces around it. After passing the laser beam, the area slightly cools, creating thermal stresses. In some designs, coolants are used to assist in the generation of thermal stress. When these induced stresses reach failure levels, a crack is propagated that causes separation.
The movement of the laser beam directs this separation in a controlled manner. This method usually requires less power than laser vaporization with better cutting speeds. Localized heating is normally carried out below the glass transition temperature.
CO&#; lasers are widely used for this application since infrared light with a wavelength of 10.6 µm is ideal for cutting most nonmetals. However, not all materials can be cut by one type of laser since different materials absorb light at different wavelengths. Thermal stress fractures are widely used to cut brittle materials such as ceramics and glass.
Another newer method that utilizes principles of thermal stress fracture is Stealth Dicing. This is a laser cutting technology originally developed by Hamamatsu Photonics which is used in cutting semiconductor wafers and parts of microelectromechanical systems or MEMS. In this type of cutting, the initial kerf is created at an internal point within the material. Stealth dicing is a dry cutting process where the cut produced is clean with no molten deposits.
This is a laser cutting technology originally developed by Hamamatsu Photonics which is used in cutting semiconductor wafers and parts of microelectromechanical systems or MEMS. In this type of cutting, the initial kerf is created at an internal point within the material. Stealth dicing is a dry cutting process where the cut produced is clean with no molten deposits.
There are different ways to create a hole using a laser. These are classified according to the movement of the laser beam relative to the workpiece. Each technique has its advantages and disadvantages.
In this type of laser drilling, a single laser pulse with high energy is used to create a hole. This single beam laser focuses on a single location until the material melts layer by layer. The melting process is done efficiently and in a short amount of time, which makes this process desirable to produce multiple holes quickly.
In percussion drilling, the laser beam diameter is the same as the hole diameter. To compare it to single-shot drilling, successive low-energy pulses are used to remove material instead of using a single laser pulse. These repeating pulses eventually penetrate the material, which takes about 4 to 20 pulses depending on the depth of the material and laser beam properties. This process is also completed quickly, which makes it effective in working with thick materials and producing multiple holes in a short amount of time.
In trepan laser drilling, the laser beam spot size is significantly smaller than the hole size. When an initial hole is made, the laser beam then traverses around the hole, expanding the drilled hole size into the desired diameter. This is done to drill large holes more efficiently than single-shot and percussion drilling. Trepan drilling is slower but can produce holes with better metallurgy and geometry.
Like trepan drilling, this type uses a moving laser beam to drill through a material. However, it does not require an initial hole. In this method, the laser beam is rotated relative to the workpiece. The laser beam&#;s rotation is similar to that of a conventional drill bit. Rotation is achieved by a spinning dove prism or other optic systems rotated by a high-speed motor. The quality of the hole produced is comparable to holes made by trepan drilling.
At first, the method for using a laser cutter was to manipulate the workpiece by hand. It was positioned, the cut was made, the laser removed, and the next cut was made. At the time, CNC programming and other technological advances did not exist. Modern laser cutting has removed the need for manual positioning of the workpiece and uses computer-controlled equipment to quickly and efficiently make the proper cuts.
The main types of gantry laser cutting machines are made of aluminum, They have a long horizontal bed and a gantry positioned over the bed. They can be programmed with multiple cuts that are performed with one pass of the laser, which can be a fiber optic or CO&#; laser. Gantry machines use CNC-controlled programming to produce efficient and accurate cuts quickly and easily. Unlike hand manipulation machines with 8 foot to 16 foot (2.4 to 4.9 m) footprints, gantry machines have a footprint of 4 feet to 8 feet. (1.2 m to 2.4 m).
In this setup, the laser cutter is stationary while the material surface moves. Since no movement from the laser is required, the optics system is simpler than other configurations. However, this is slower than other methods and is usually limited to cutting flat materials.
This setup is the opposite of the moving material configuration. The flying optics system involves a stationary material and a movable laser cutter. Since the laser is constantly moving, the laser beam length must be adjusted constantly as well because of the divergence of the laser beam. Greater divergence produces a poorer quality of cut. To mitigate this, re-collimating optics and adaptive mirror control are used. This setup is the fastest of the three since the movement of the mirrors is easier to control.
In the hybrid system, the material moves on one axis while the optics move on the other axis. This setup combines both advantages and disadvantages of the previous two setups. One advantage of this system from flying optics is that hybrid systems provide a more constant beam path, which reduces power losses.
CNC laser cutting uses a high powered laser beam to mark, cut, shape, engrave, and form material. It is a highly accurate cutting technique capable of shaping small holes and intricate designs. As with all types of CNC machines, CNC laser cutters use the G codes and M codes created for CNC programming as instructions for tool movement and performance.
Unlike traditional CNC machining, CNC laser cutters are non contact and thermal based with a laser head that contains a focusing lens and nozzle. The nozzle, with the lens and head, focuses high intensity light at the workpiece to melt and cut it. Compressed gas flows through the nozzle to cool the lens and remove vaporized metal.
Types of CNC Laser Cutting Machines are:
The process of 5 axis laser cutting makes it possible for the tilting and rotating of the workpiece on the table, which enables the laser to work on three dimensional components that need drilling and cutting on difficult to reach curved surfaces at extreme angles. The use of 5 axis laser cutting reduces the time required to adjust the workpiece to complete the cutting process since the performance of multiple setups increases the possibility of errors.
A rotary laser cutter uses a rotating device that positions the workpiece such that it can cut along curved surfaces. The rotary component is a motorized attachment that rotates the workpiece during the cutting process and enables the cutter to make 360 degree cuts and engravings on pipes, tubes, bottles, elliptical tubes, and D shaped items. They are capable of placing intricate designs, logos, patterns, and information on curved surfaces. As with all forms of lasers, the process is performed with high efficiency and precision.
The term small laser cutting, or small geometry laser cutting, refers to design features that are intricate and small. Small geometry laser cutters are used for projects that are too small to be cut by regular cutting methods and are used to avoid loss of resolution. The use of the process applies to parts with features that are smaller than the width of the kerf.
Small geometry laser cutting has exceptional precision that makes it possible to create delicate designs with high tolerances. The thickness of the material determines when small format or geometry laser cutting is used since the use of large laser cutters can impact the final product. Additionally, the use of small format geometry laser cutters is dependent on the size of the feature to be cut, which can be smaller than the kerf of 0.1 mm (0. in).
Large format laser cutting is used when the feature to be cut is an enlarged version of an ordinary feature. The process of large format laser cutting is defined as a project that is larger than the workspace. A large format laser cutter can have a workspace of 3.2 m by 8 m (10.5 ft by 26.25 ft) and is designed for cutting extremely large materials.
Flatbed laser cutting systems are used for large format cutting with bed sizes ranging between 1.3 m by 2.5 m up to 2 m by 3 m (4.3 ft by 8.2 ft up to 6.56 ft by 9.84 ft). The size of a flatbed laser cutter makes it possible to place the material in the processing area for automatic cutting and engraving.
Flatbed laser cutters are large format laser cutters capable of cutting metals, cloth, wood, and various materials. They can cut a single large feature into a large piece of material or multiple features into several pieces. Flatbed laser cutters have a large flat, horizontal surface for the placement of materials. The laser is enclosed in a mechanism that moves along the sides of the bed as the laser moves back and forth over the cutting surface.
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The laser for flatbed laser cutters can be CO&#;, fiber, or crystal. The choice of which type of laser to use in a flatbed laser cutter is dependent on the material to be processed with CO&#; lasers used for non-metallic materials while fiber lasers are used for metals. Flatbed laser cutters can have materials continuously fed as part of a production or assembly operation.
Galvo laser cutters deflect the laser beam using mirrors that move the beam in different directions by rotating, adjusting, and repositioning mirror angles. The processing by galvo laser cutters relies on the galvanometer that detects and measures electric current by moving a magnetic field.
A galvanometer laser detects electric current and directs the laser to the marking surface using a system of mirrors. The design of galvo lasers makes it possible for them to rapidly complete the engraving process, which is much faster than a traditional laser that moves along the X and Y axis at a slow speed. More area of the workpiece is marked at a higher rate. The key factor is the quick repositioning of the mirror angles in relation to the cutting surface.
There are many laser cutting machines available in the United States and Canada that are essential to today's society due to their precision and versatility, enabling efficient fabrication of intricate parts and components for various industries, fostering technological advancements and economic growth. We examine several leading laser cutting machines and their manufacturers below.
Popular models: TruLaser , TruLaser , TruLaser Fiber
Features: The Trumpf TruLaser Series is renowned for its high-quality cutting performance, advanced laser technology, and automation capabilities. These TruLaser machines utilize fiber laser sources, which offer excellent cutting speeds and efficiency, especially when processing thin to medium-thick materials. These machines often feature intelligent automation options, such as automated loading and unloading systems, to maximize productivity.
Popular models: LC-, LC-, LC- Alpha
Features: Amada LC Series machines are well-known for their exceptional accuracy and reliability. They are equipped with high-power lasers and advanced cutting controls, making them suitable for a wide range of applications and material thicknesses. The LC Series often incorporates proprietary technology, such as the AMNC 3i control system, which provides user-friendly interfaces and improved cutting performance.
Popular models: ByStar Fiber, ByStar Fiber , ByStar Fiber
Features: The Bystronic ByStar Series is appreciated for its high-speed cutting capabilities and energy-efficient fiber laser sources. These machines often feature large working areas, making them suitable for processing large sheets and plates. Bystronic's innovative cutting heads and intelligent control systems contribute to their popularity, enabling precise and fast cutting of various materials.
Popular models: Optiplex Fiber III, Optiplex Fiber III, Optiplex Nexus Fiber
Features: Mazak's Optiplex Series is known for its advanced fiber laser technology and robust construction. These machines offer excellent cutting performance across a wide range of materials, including steel, aluminum, and copper. Mazak's Intelligent Setup Assistant and PreviewG control technology are some of the features that enhance the ease of use and productivity of their laser cutting machines.
Popular models: CL-960, CL-940
Features: The Cincinnati CL-900 Series is recognized for its powerful laser sources and versatile cutting capabilities. These machines often come with high-speed shuttle tables for efficient material handling, reducing downtime between cuts. The ProFocus&#; Laser Cutting Head and the Touchscreen HMI provide users with intuitive control and precision cutting performance.
Keep in mind that the popularity of these machines may vary based on specific industry needs, budget considerations, and regional preferences. Additionally, new models and advancements in laser cutting technology may have emerged since this last update, so it's always wise to research the latest options available in the market.
Laser marking is the process of creating marks using lasers by cutting the surface of the workpiece at a shallow depth or by inducing chemical changes through burning, melting, ablation, polymerization, and so forth. Like laser cutting and laser drilling, laser marking can be a non-contact process. Issues of tool wear and unwanted work hardening on the surface of the workpiece are eliminated. Moreover, laser marking does not use inks, an advantage over traditional printing. Different types of laser marking processes are summarized below.
This process involves removing specific regions of the coating layer previously applied on the surface of the workpiece. The workpiece has a different contrast from the coating which makes the regions removed significantly visible. Materials for this type of laser marking are special films and coated metals.
This is a laser marking where the surface is cut at the desired depth. The cut is usually made by the laser vaporization process. The main advantage of this method is that it can be done at high speeds.
This is done by fusing additional pigmented materials such as glass powders or crushed metal oxides on the surface of the workpiece. The heat applied by the laser fuses the materials.
This process involves heating specific regions using a laser. The heat applied by the laser causes the metal to oxidize producing different colors such as black, yellow, red, and green.
In this process, plastic bonds between polymers are broken, releasing hydrogen and oxygen and producing a darker color. This process is done on plastics and organic materials.
This is usually done on plastics where the color pigments and carbon are destroyed and vaporized resulting in foaming. The foaming process is done on dark-colored materials that need to have lighter colored markings.
This process induces chemical reactions on the surface of the workpiece where the products of the reaction have different colors.
Laser drilling is widely used in aerospace, automotive, electronics, and tool machining. Below are the main advantages of using lasers for drilling.
As mentioned earlier, since the laser drilling process has no cutting tools involved, there is no issue of tool wear or damage. In conventional drilling, drill bits can become dull, making the cutting slower and producing more heat. This can distort the material and change its mechanical properties due to heating.
Since laser beams can be focused, this allows precise drilling of small holes that conventional drilling cannot achieve. The hole depth can be controlled even for micro-scale holes. Moreover, the process is digitally controlled by CNC methods. All parameters can be automatically controlled, producing consistent and repeatable results.
Secondary processes such as deburring are required in manufacturing precision parts to remove surface irregularities, metal spurs, raised edges, slags, and dross. Even the most accurate fabrication techniques such as laser cutting technology, tend to develop dross or thermal burrs. However, in comparison with conventional cutting, laser-cut parts still have superior edge quality. This effectively lessens the cost of secondary processes, particularly deburring, which can be as high as 30% of the operating costs.
This means very deep holes with small diameters can be drilled without issues. Drilling these holes using conventional drills causes the tool to heat up, wobble, and break due to torsional stress. Using a laser creates no frictional resistance and is only limited by the laser generator and the optical systems used.
Lasers can cut and drill different materials that are difficult for conventional machining. Lasers can cut high-strength metals such as titanium and steel superalloys. Aside from these high-strength metals, laser cutting is used for cutting crystals, ceramics, and even diamonds because of its ability to do controlled fracture.
Since there is no required tool positioning against the workpiece, drilling speeds only depend on the configuration of the optical system and the movement of the cutting head. Moreover, the complexity of the profile to be cut has minimal effect on the incremental cost of operating the machine.
Since most of the molten material is blown off by the assist gas, no residual stresses are present along the drilled edges. This results in a clean, mechanically stable cut.
Despite these advantages, current laser drilling technology cannot completely replace conventional methods. Below are the main reasons.
Laser cutting machines can reach prices twice as much as waterjet and plasma cutters. The investment&#;s rate of return may not be sufficient to produce any economic advantage.
Operating a laser cutting machine requires a specialist with a good technical background because of the range of operating parameters involved. Also, for CO&#; and crystal lasers, an expert is needed to bring them back to their operating condition once it becomes misaligned.
Highly precise movements are required in laser cutting, especially in applications in the order of microns. Two factors can affect the movement of the laser beam. One is the accuracy of the control system and drivers. The control system must be able to process and send precise signals to the high-resolution driver to finely position the laser beam. The other factor is the dimensional accuracy of the laser cutting parts. Linear guides, lead screws, and other parts of the transmission system must accurately mate together. This can be achieved by deburring the laser cutting parts.
The depth of cut depends on many parameters, but the most significant is power. For the same power rating, plasma cutters can cut deeper than lasers. Common industrial laser systems of greater than 1kW can cut carbon steel up to 13 mm in thickness.
The terms plasma and laser cutting are sometimes used interchangeably since both are cutting processes. However, regardless of their basic similarities, they are different in how they are applied and their principles. Both methods were developed in the middle of the twentieth century and have been perfected and modernized to fit the needs of present-day manufacturing techniques.
Laser cutting is a process that cuts materials by amplifying of a laser light. It has exceptional precision due to being controlled by a CNC controller. Laser cutting involves focusing a laser light using optics. As the light becomes smaller and hotter, it melts and cuts through a workpiece as a computer directs the process. The workpiece is burned during the melting process, and an assist gas or vaporization blows off waste material.
Plasma cutting is a method for cutting electrically conductive materials using oxygen or nitrogen gas and a jet of hot plasma to melt the surface of a workpiece, regardless of how rugged or tough it may be. The unique characteristic of plasma cutting is the limitation of the materials it can cut, which are electrically conductive and include aluminum, stainless steel, steel, brass, and copper. The cutting plasma is a conductive ionized gas that is extremely hot during the cutting process. Although all plasma cutting tools are the same, the type of tool is determined by its temperature.
All plasma cutting tools burn very hot at temperatures exceeding 40,000 degrees Fahrenheit (22,200°C). When the process is combined with CNC machining, it produces parts that do not require further finishing or machining. Unlike laser cutters, plasma cutters discharge radiation, which necessitates the use of protective clothing and glasses or goggles for workers.
The main difference between the two processes is the fuel used to power the cutting process with plasma cutting using a plasma gas, while laser cutting involves a beam of light. Additionally, there is some danger involved with plasma cutting due to the radiation it emits. Both processes are efficient and precise cutting methods that diverge in accordance with how they complete the process.
Laser cutting is a process that uses a laser to cut different materials for both industrial and more artistic applications, such as etching.
This article is one of a series of TWI frequently asked questions (FAQs).
Laser cutting uses a high-power laser which is directed through optics and computer numerical control (CNC) to direct the beam or material. Typically, the process uses a motion control system to follow a CNC or G-code of the pattern that is to be cut onto the material. The focused laser beam burns, melts, vaporises or is blown away by a jet of gas to leave a high-quality surface finished edge.
The laser beam is created by the stimulation of lasing materials through electrical discharges or lamps inside a closed container. The lasing material is amplified by being reflected internally via a partial mirror until its energy is enough for it to escape as a stream of coherent monochromatic light. This light is focused at the work area by mirrors or fibre optics that direct the beam through a lens which intensifies it.
At its narrowest point, a laser beam is typically under 0. inches (0.32 mm) in diameter, but kerf widths as small as 0.004 inches (0.10mm) are possible depending on material thickness.
Where the laser cutting process needs to start anywhere other than the edge of the material, a piercing process is used, whereby a high power pulsed laser makes a hole in the material, for example taking 5-15 seconds to burn through a 0.5-inch-thick (13 mm) stainless steel sheet.
This process can be broken down into three main techniques - CO2 laser (for cutting, boring, and engraving), and neodymium (Nd) and neodymium yttrium-aluminium-garnet (Nd:YAG), which are identical in style, with Nd being used for high energy, low repetition boring and Nd:YAG used for very high-power boring and engraving.
All types of lasers can be used for welding.
CO2 lasers involve the passing of a current through a gas mix (DC-excited) or, more popularly these days, using the newer technique of radio frequency energy (RF-excited). The RF method has external electrodes and thereby avoids problems related to electrode erosion and plating of the electrode material on glassware and optics that can occur with DC, which uses an electrode inside the cavity.
Another factor that can affect laser performance is the type of gas flow. Common variants of CO2 laser include fast axial flow, slow axial flow, transverse flow, and slab. Fast axial flow uses a mixture of carbon dioxide, helium and nitrogen circulated at a high velocity by a turbine or blower. Transverse flow lasers use a simple blower to circulate the gas mix at a lower velocity, while slab or diffusion resonators use a static gas field which requires no pressurisation or glassware.
Different techniques are also used to cool the laser generator and external optics, depending on the system size and configuration. Waste heat can be transferred directly to the air, but a coolant is commonly used. Water is a frequently used coolant, often circulated through a heat transfer or chiller system.
One example of water cooled laser processing is a laser microjet system, which couples a pulsed laser beam with a low-pressure water jet to guide the beam in the same manner as an optical fibre. The water also offers the advantage of removing debris and cooling the material, while other advantages over &#;dry&#; laser cutting include high dicing speeds, parallel kerf, and omnidirectional cutting.
Fibre lasers are also gaining popularity in the metal cutting industry. This technology uses a solid gain medium rather than a liquid or gas. The laser is amplified in a glass fibre to produce a far smaller spot size than that achieved with CO2 techniques, making it ideal for cutting reflective metals.
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