We know that choosing the right green laser pointer cooling system can greatly improve the life and processing accuracy of the laser, and the performance of the laser equipment can be fully realized. Laser chiller is a kind of equipment specially used for laser cooling and cooling. It protects CO2 laser tube, YAG solid-state laser crystal and lamp riot during laser processing. In addition, the full and constant laser cavity temperature is stable. The laser cavity is guaranteed without thermal deformation and the laser beam quality is consistent. So, how to choose the laser chiller correctly? Xiaobian introduces six key factors to help you choose.
Factor 1, water quality requirements and water filtration and water circulation system materials, this comprehensive indicator is often ignored, but it is very important, directly affecting the life of the green laser pointer.
Factor two, cooling capacity
1, cooling capacity, as the name suggests is the actual cooling capacity of the cooling system, is the indicator of laser cooling equipment selection.
2. Generally, we can calculate the calorific value of the laser according to the photoelectric conversion efficiency of the laser, and then choose.
P heat = P laser / μ. Assuming that the thermal efficiency μ of the glass tube CO2 laser is generally 15%, the 80W laser requires a minimum of 80/0.15=533W. That is to say, while generating an 80W laser, the laser injects 533W of energy, and the ineffective energy needs to be taken away by the water cooler.
3. We determine the cooling capacity of the laser chiller based on the input power of the laser power minus the output power of the laser. For example, our commonly used RF lasers and solid-state lasers will indicate the power supply voltage and current of the rated full power. Taking the coherent 70W RF laser as an example, it requires a power input of 48V25A, instantaneous 36A, and can calculate the input power up to 1200W.
Factor 3: For the CO2 glass tube green laser pointer, the lens at both ends belongs to the water flow dead angle, it is easy to retain impurities in the water, resulting in poor heat dissipation, and the micro-deformation of the lens directly affects the output beam quality and spot pattern of the laser.
Factor four, water flow and booster pump head
In general, the cooling capacity represents the cooling capacity provided by the compressor, and the water flow represents the ability of the chiller to remove heat. This causes the phenomenon that people often see: a chiller with a nominal cooling capacity of 1000W is connected to an 80W glass. Tube, the chiller shows 25 ° C, but the laser tube is hot; this is related to the water flow.
Factor five, thermal efficiency and water volume
The above two concepts lead to the concept of water cooling machine thermal efficiency and water volume, which is the working control mode of the compressor and the size of the water tank. Generally, the larger the tank, the better, but the different compressor control methods in design will be very different. This is the same compressor cooling capacity and water volume. The operation control mode with PID feedback function will greatly improve the cooling capacity of the overall system.
Factor six, temperature control accuracy
This index is completely from the requirements of the laser. For semiconductor lasers, the temperature control accuracy must be ±0.1 °C, which requires the compressor to predict the temperature change law, the adaptive load change, and generally the water cooler with integrated temperature control module. May do this. Of course, for CO2 lasers, the temperature requirement is ±2°C to ±5°C, and most of the dedicated water coolers on the market can do this.