When it comes to fiber laser machines, selecting the right laser parameters is crucial for achieving optimal results. However, with so many variables to consider, it can be challenging to determine the ideal settings for your specific application.
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In this guide, we’ll walk you through the process of selecting the right laser parameters for your fiber laser cutting machine. By following our tips and guidelines, you can ensure that your machine is operating at its full potential, delivering high-quality and precise results every time. So, let’s get started!
Fiber laser settings are the key characteristics that define the behavior and output of a laser. These parameters include the following:
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Measuring the fiber laser setting is an essential step in optimizing the performance of your fiber laser cutting machines. Here are some common methods for measuring the laser parameter:
In summary, measuring laser parameters involves using various instruments and methods to determine the laser’s power, light wavelength, pulse duration, beam shape, polarization, and beam quality.
By measuring these parameters accurately, you can optimize the performance of your fiber laser cutting machine and achieve better results in your laser processing tasks.
Laser parameters play a crucial role in determining the quality of laser cutting. Here are some ways in which fiber laser settings can influence the cutting quality:
Laser power affects the cutting speed and quality. Higher power can increase the cutting speed but also cause more thermal damage to the material, resulting in a rougher edge quality. Lower power settings can provide finer control and higher edge quality.
Pulse frequency determines how many laser pulses are fired at the material per second. Higher pulse frequency can result in smoother and more precise cuts but may also increase the likelihood of thermal damage. Lower laser pulse frequencies can provide better control over the cutting process.
The wavelength of the laser beam determines the absorption characteristics of the material being cut. Different materials have different absorption properties, which means that the optimal wavelength for cutting will vary depending on the material being cut.
For example, CO2 lasers with longer wavelengths of 10.6 microns are commonly used for cutting non-metallic materials, while fiber lasers with shorter wavelengths of 1 micron are better suited for cutting metals. In order to choose the right laser technology, you need to understand the difference between CO2 and fiber laser technology.
The focusing lens used in the laser cutting system can affect the beam quality and focal spot size, which in turn can affect the cutting quality. Different lens types are available for different cutting applications, such as focusing lenses for general-purpose cutting and collimating lenses for marking and engraving.
The diameter of the laser beam affects the focusability and intensity of the laser beam. Smaller beam diameters can provide higher precision and finer detail in the cutting process but may also be more prone to deflection or beam distortion.
In summary, selecting the right fiber laser settings for your cutting application can significantly impact cutting speed, precision, and quality. By understanding the influence of power, pulse frequency, wavelength, lens type, and beam diameter, you can optimize your laser cutting process and achieve better results.
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Here are two tables to help you choose the right parameters for different cutting materials:
Material1000W2000W3000W4000W5000W6000WAluminium2 mm4 mm6 mm8 mm10 mm12 mmBrass1 mm3 mm5 mm7 mm9 mm11 mmCarbon Steel0.5 mm2.5 mm5 mm7.5 mm10 mm12.5 mmStainless Steel1 mm3 mm5 mm7 mm9 mm11 mm Material7000W8000W9000W10000W11000W12000WAluminium14 mm16 mm18 mm20 mm22 mm24 mmBrass13 mm15 mm17 mm19 mm21 mm23 mmCarbon Steel15 mm17.5 mm20 mm22.5 mm25 mm27.5 mmStainless Steel13 mm15 mm17 mm19 mm21 mm23 mmNote: The tables provide a general guideline, and the actual performance may vary depending on the specific laser machine and its configuration. It is always recommended to consult the laser cutting machine manual or the laser cutting machine manufacturers for the most accurate settings.
Here are some steps to help you optimize your fiber laser settings:
Start with the recommended power settings for the cut material, then gradually increase or decrease the power to find the optimal setting for the desired cutting quality. Keep in mind that higher power can result in faster cutting, but it may also cause more thermal damage to the material.
Pulse frequency determines the number of laser pulses per second and can impact the cutting quality and precision. Higher pulse frequencies can provide smoother and more precise cuts but may also increase the likelihood of thermal damage. Adjust the pulse frequency to find the optimal setting for the desired cutting quality.
The type of lens used in the laser cutting system can affect the beam quality and focal spot size, which can impact the cutting quality. Choose the right lens type for your cutting application, such as focusing lenses for general-purpose cutting and collimating lenses for marking and engraving.
The diameter of the laser beam can affect the focusability and intensity of the laser beam, which can impact the cutting quality. Choose the optimal beam diameter based on the desired cutting quality for your cutting application.
Proper beam alignment is critical for achieving optimal cutting quality. Check and adjust the beam alignment regularly to ensure that the laser beam is properly focused on the material.
Regular laser system maintenance and cleaning can help ensure optimal cutting quality. Monitor the system for any signs of wear or damage, and replace any worn or damaged components as needed.
By following these steps and continuously monitoring and adjusting your fiber laser settings, you can optimize your laser cutting process for the best cutting quality.
Laser parameters play a crucial role in laser cutting, but some common misconceptions can lead to suboptimal cutting quality. Here are some misconceptions to watch out for:
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By avoiding these common misconceptions and regularly monitoring and adjusting laser parameters, you can achieve optimal cutting quality in your laser cutting process.
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When it comes to laser applications, different jobs require different laser parameters. For example, laser engraving requires different parameters than laser cutting, and laser marking requires different parameters than welding. Here are some tips for fine-tuning fiber laser settings for different applications:
Engraving requires a high pulse frequency and low power setting to achieve a precise, shallow cut. Short pulse duration and low repetition rate are also important for achieving a high level of detail. The optimal laser parameters will vary depending on the material being engraved.
Laser marking requires a lower pulse frequency and higher power setting to achieve a deeper mark using the fiber laser marking machine. The pulse duration should be longer than in engraving, and the repetition rate should be high to ensure consistency.
The optimal laser parameters will depend on the material being marked and the desired mark depth of the fiber laser marking system.
Laser cutting requires a high power setting and low pulse frequency to achieve a clean, efficient cut. The pulse duration should be shorter than in engraving or marking, and the repetition rate should be moderate. The optimal laser parameters will depend on the material being cut and the desired cut quality.
Laser welding requires a high power setting and long pulse duration to achieve a deep, strong weld. The pulse frequency should be low, and the repetition rate should be moderate to allow for cooling between pulses. The optimal laser parameters will depend on the welded material and desired weld strength.
Here is a table summarizing the optimal laser parameters for different applications:
ApplicationPower SettingPulse FrequencyPulse DurationRepetition RateEngravingLowHighShortLowMarkingHighLowLongHighCuttingHighLowShortModerateWeldingHighLowLongModerateYou can fine-tune your fiber laser machine to achieve the best results by understanding the optimal laser parameters for different applications and materials. We also have plasma cutting machines, just like laser marking machines. They work similarly to a fiber laser cutter using laser light.
In conclusion, choosing the right laser parameters is crucial for achieving optimal cutting quality and efficiency.
By understanding the various parameters of fiber laser technology, such as power, wavelength, pulse duration, repetition rate, beam quality, and mode structure, one can fine-tune their fiber laser machine to suit the specific requirements of their application.
It’s also important to keep in mind that different materials have different properties and require specific laser parameters for cutting. Using the guidelines and tables in this blog, one can select the appropriate laser parameters for their specific application and material, resulting in high-quality and precise cuts.
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In CO2laser cutting and welding, optics is where the rubber hits the road. No matter how precise the motion control or the beam quality from the resonator is, a high-quality, highly efficient operation can't happen without the right optics delivering the beam to the workpiece (see Figure 1).
Since CO2lasers first emerged in the industrial market, the compositions and coatings for optics have changed tremendously. In the 1970s, optics could handle resonator powers up to 500 watts. Today they can handle up to 7,000 W in 2-D laser cutting and up to 20,000 W in multiaxis machines used for both laser cutting and welding. For the past decade, optics manufacturers have advanced production techniques to meet demand, using diamond turning technology to machine lens and mirror geometries such as nonrotationally symmetric and other shapes for industrial applications.
Not only can today's optics handle more power, they also enhance beam quality, reduce maintenance, increase power delivered to the cutting head, and improve mode stability. The result is faster and more reliable material processing.
The most significant advancements in optics have come from new materials and coatings. For instance, zinc selenide (ZnSe) has become a key transmissive material for resonator output mirrors and focusing lenses. Its absorption capabilities, cosmetic quality, and consistency have continually improved, producing better beam quality.
Better coatings for optics have improved beam quality dramatically over time. Years ago lasers produced a clean cut in one direction, yet produced compromised edge quality cutting in the other direction. This occurred because CO2lasers had linear laser polarization in one direction, but not the other. In basic terms, these beams had an electrical field with a frequency that oscillated in a flat plane. This "flat" plane meant the beam would behave differently, producing varying kerf widths depending on the direction of travel.
By the early 1980s, new optical coatings solved this problem. Still used today, reflective phase-retarder coatings—also known as phase-locking mirrors—convert the beam to a circular polarization, with an electrical field traveling in a circular pattern instead of a flat plane. These coatings, followed by zero-phase-shift coatings introduced in the mid-1980s, eliminated the kerf variations and improved cut quality by maintaining the circular polarization as the beam launched through the delivery system.
How well optics can withstand thermal load has a direct impact on how long the optics last. Some of the first optics had an average lifetime of 300 to 500 hours; they failed because the optics coating wore out.
Today's beam delivery optics last upward of 10,000 hours, and this comes largely from the technological advancements of coatings. By protecting the optics—and effectively reducing the amount of heat the optics are subject to—coatings help optics last longer, as well as reduce overall maintenance and operating costs.
Reducing beam absorption rates also helped reduce thermal loads, and here again coatings have played a key role. If optics absorbed a high amount of beam energy, it not only increased thermal loads and reduced optics life, but it also severely reduced beam efficiency. In older optics, beam absorption rates were as high as 1 percent per external optic delivering the beam to the workpiece. At this rate, a 4,000-W machine with seven external beam delivery optical devices would lose about 280 W—or about 7 percent of its power—between the resonator and cutting head. The poor absorption rate also resulted in a large thermal load on the mirror, which in turn led to beam distortion and, ultimately, changes in beam alignment. All this had a negative effect on the part being processed.
The industry needed laser delivery with higher reflectivity to reduce beam absorption rates—again, optical coatings were instrumental. By the 1990s, high-reflectivity, low-absorption mirror coatings, enhanced with silver and gold coatings, produced reflectivity of about 99.5 percent.
Since then superenhanced coatings with reflectivity surpassing 99.8 percent have entered the market. These maximize the laser power as it travels through the beam delivery system and reduces the thermal load on the optics, which ultimately increases mirror life. Now a 4,000-W machine with seven external beam delivery optical components loses about 56 W, or less than 1.5 percent of overall power, from the resonator to the cutting head.
All these coatings handle reflectivity between the resonator and cutting head, but what about back reflection from the workpiece itself? Common when working with highly reflective materials like aluminum, back reflection can cause mode instability, damage the beam delivery optics, and potentially travel back into the resonator and cause irreparable damage. Such back reflection has been significantly reduced thanks to absorbing thin-film reflector (ATFR) coatings. Introduced in the 1990s, the ATFR coating, used in conjunction with the reflective phase-retarder optic, functions as an optical isolator to absorb back reflections from the workpiece.
These new coatings also reduce electrical costs to operate a laser. Most laser machines use a closed-loop chiller to cool the optics. Within the chiller system, some laser manufacturers use deionized water, while others use glycol, an antifreeze fluid. The cooling helps extend mirror life and remove thermal load that could cause distortion. Optics with new coatings absorb less heat and so enable the use of smaller chillers and condensers, requiring less electricity.
The final optic in the beam delivery system is the cutting head lens. Lenses with antireflection (AR) coatings, the newest versions of which have been available since the late 1990s, produce absorption values of less than 0.1 percent at 10.6 mm, resulting in even less thermal distortion and longer lens life. Some laser machines also have an internal optical sensor to monitor the cutting head lens and prevent a total decomposition or breakdown, where excess heat literally disintegrates the cutting lens.
Over the years engineers have increased the thickness of cutting head optics to support high-pressure assist gases, which are needed to attain an oxide-free edge when cutting stainless steels, aluminum, and, in some instances, mild steel, particularly when the part moves directly from cutting to the powder-coat process without any secondary operation. Using high pressure also allows fabricators to cut with compressed air, resulting in increased speeds, reduced assist gas costs, and lower cost per part. Unfortunately, a traditional 4-mm-thick cutting lens would break under high-pressure assist gas. So these have been replaced with 8-mm lenses that can endure the pressure (seeFigure 2).
One of the latest innovations allows operators to change the beam focus position on-the-fly. Known as adaptive optics, these have an adjustable radius of curvature, controlled with water or air pressure (see Figure 3). Used for the focus-depth adjustment during piercing, they adjust for focal length variations across the working table.
Adaptive optics decrease process cycle time per part because there is virtually no time wasted between the pierce and the beginning of the cut. On the manufacturing floor, a machine with adaptive lenses can run fully automated without changing the cutting head or adjusting the focusing lens, significantly increasing productivity.
Besides adjusting focal length on-the-fly, some 2-D cutting machines use an adaptive optic to adjust the beam diameter. Traditionally, machines have repositioned the cutting head lens when moving from the piercing to the cutting cycle. Using adaptive optics, a machine need not mechanically reposition the lens between piercing and cutting, decreasing cycle time. More important, adaptive optics allow the laser to process all material types and thicknesses (within the machine's overall capacity) with one cutting head (seeFigure 4).
Beam delivery optics have come a long way since the 1970s. From improved coatings to thicker lenses for high-pressure applications, advancements in optics have helped drive the quality and productivity of today's laser cutting machines. Fabricators who offer laser cutting are direct benefactors of the enhanced beam quality, reduced maintenance, increased power, and improved mode stability, all stemming from years of research and development invested in laser beam delivery optics.
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