During laser processing, not only CO2 laser tubes, YAG solid state laser crystals, and lamp tubes are protected against explosions; Adequate and constant laser cavity temperature ensures stable laser output power, no thermal deformation in the laser cavity, and consistent laser beam quality. Choosing a suitable laser cooling system can greatly improve the service life and processing accuracy of the laser, and maximize the performance of the laser equipment. However, most users and manufacturers often have a vague concept when selecting and recommending laser cooling systems. Many laser water chillers on the market also have unclear indicators, and users' equipment also follows the trend, unable to accurately provide reasonable protection for the laser equipment used. The following indicators are key to the selection of laser chillers:
1. Refrigeration capacity
A. As the name implies, the actual cooling capacity of the cooling system is the first indicator for selecting laser cooling equipment.
Generally, we can calculate the heat output of the laser based on the photoelectric conversion efficiency of the laser, and then choose.
P heat=P laser/ μ
Assuming the thermal efficiency of a glass tube CO2 laser μ Generally, it is 15%, and the minimum requirement for an 80W laser is 80/0.15=533W
That is to say, while generating an 80W laser, the laser injects 533W of energy, and the invalid energy needs to be taken away by a water cooler.
C. Sometimes, we directly determine the cooling capacity of the laser water chiller based on the input rated power of the laser power supply minus the output power of the laser. For example, our commonly used RF lasers and solid-state lasers will be marked with the rated full power supply voltage and current. For a coherent 70W RF laser, for example, it requires a power input of 48V25A, instantaneous 36A, and can calculate the maximum input power of 1200W.
2. Water flow and booster pump head
Everyone pays attention to the cooling capacity and often ignores the indicator of water flow. The cooling capacity represents the cooling capacity that the compressor can provide, while the water flow rate represents the ability of the chiller to carry away heat, which leads to a phenomenon that is often seen: a chiller with a nominal cooling capacity of 1000 W is connected to an 80 W glass tube, and the chiller displays 25 ℃, but the laser tube is hot and hot; In fact, it has not played a role in application.
3. Thermal efficiency and water volume
The above concepts lead to the concepts of thermal efficiency and water volume of a water cooler, namely, the working control mode of the compressor and the size of the water tank. Generally, the larger the water tank, the better, but the different compressor control methods in design can vary greatly. This is the same cooling capacity and water volume of the compressor. The operation control method with PID feedback function will greatly improve the cooling capacity of the overall system.
4. Temperature control accuracy
This indicator completely comes from the requirements of lasers. For semiconductor lasers, the temperature control accuracy must be ± 0.1 ℃, which requires the compressor to predict the temperature change rule and adapt to the load changes. Generally, water coolers with integrated temperature control modules cannot achieve this. Of course, for CO2 lasers, the temperature requirement is from ± 2 ℃ to ± 5 ℃, which can be achieved by most dedicated water coolers on the market.
5. Water quality requirements and water filtration and water circulation system materials
A. This comprehensive indicator is often ignored, but it is very reusable and directly affects the lifetime of the laser.
B. For CO2 glass tube lasers, the lenses at both ends are at dead ends of the water flow, which can easily trap impurities in the water, resulting in poor heat dissipation. The micro deformation of the lenses directly affects the output beam quality and spot mode of the laser.
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