科研之友
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摘要
Temperature fluctuations often cause damage to precision instruments, such as Nd:YVO4/KTP and Nd:YAG lasers, so it is important to control the temperature of the instruments. Thermal effects strongly affect the output power of high power lasers; this has been widely studied [1-6]. The temperature fluctuations of the cooling water in a water chiller that uses a power on-off controller or a power frequency controller are usually more than /-2 degreesC or /-1 degreesC, respectively. In this paper, PID regulation is firstly used to control the heating power, which is based on the variation of the laser output while the cooling system is constantly running to control the temperature of the cooling water. By a series of experiments, the laser cooling system has been proved to be operational and dependable. While the laser power varies between 0 kW and 5 kW, the fluctuation of the constant cooling water is less than /-0.5 degreesC.
