The application of the solid state lasers has been greatly expanded in many domains. The laser system is required to be highly integrated. In this paper, an integrated design scheme of laser diode pumped solid state laser is proposed. The size of the device is reduced by integrating the laser power source with LD pump module. The MCU and low-temperature drift drive circuit is utilized as the hard core. The simplified effective pre-stage DC-DC power source and a quasiresonant full-bridge temperature control circuit are designed. The deep negative feedback for the discharge control loop is concluded in the design. The TEC is used and the control accuracy is ±0.5℃ by the using of predictive PID. The ripple and rise time of the current waveform is tested and the stability of the power supply operated at 20Hz is verified by the load test. The experiment results reveal that this system has good load capacity and stability. Compared with the previous power supply system, this system is small and compact. The power supply efficiency is improved by more than 10% and the size of device is greatly reduced.
KEYWORDS: High power lasers, Cooling systems, Solids, Temperature metrology, Laser systems engineering, Copper, Laser applications, Thermal effects, Control systems, Resistance
High-power lasers require tremendous power consumption, generate large heat loads in short time periods, and have challenging cooling requirements. A cooling system of phase change energy storage that reduced the volume and weight by many times was proposed. The system included a laser cooling circuit and a phase change cooling circuit. Designed a phase change cold storage heat exchanger, which was the closed heat exchanger that the cooling circuit consisted of multiple bundles of copper tubes and the phase change material was paraffin. Based on the experimental results, designed another open phase change energy storage cooling system with better performance. Comparisons of these two types of phase-changing heat exchangers showed that choosing water as phase-changing material can get more accurate temperature control.
We demonstrated a large face pumped double-sided liquid cooling Nd:YAG slab laser. The pump light incident from the large surface of the crystal, which are cooled by high-speed flowing cooling water, while the laser beam incident on to the end face, and travels in ZigZag path along the long direction in the crystal. The flat-flat resonant cavity was built, and the output coupler transmission was 30%. The Nd:YAG slab crystal with trapezoidal shape was used as the gain medium, the size of which was 190mm×12mm×4mm, one of the surfaces of 190mm×12mm was coated with antireflection film for 808nm and another was coated with reflection film for 808nm, and the end faces of 4mm×12mm were coated with antireflection film for 1064nm, the doping concentration of Nd3+ ion was 1.0at.%. The CW LD array and QCW LD array were used as the pump source to pump the slab crystal, the light emitting surfaces of which have the same size, and the pumping light passed through the pump windows made off used silica and incident into the crystal. Under CW LD pump, the maximum of 420W laser output was gotten, and under QCW LD pump, the maximum of 502W laser out put was gotten. Due to the much higher peak power of QCW laser diode, the small-signal gain was much higher, and induced the optical efficiency of QCW pumping system was much higher, and its thermal effect was relatively smaller because of the high extraction efficiency.
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