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.
Solid-state lasers are widely used in many applications. The LD pumping module is the power source of the laser system. A well-designed pumping light field can achieve high efficiency and high quality laser output. In this paper, a mathematic model of the side-pumping module is constructed. The light field of a single LD bar is tested and simulated with different parameters with the ray tracing method. Then the pump power distribution in the cross section of the LD array is analyzed, which indicates the absorption and distribution in the laser rod. An improved method by increasing the pumping sides is proposed to achieve higher pumping homogeneity. Simulation results show that the pumping homogeneity is improved. A pumping module is produced according to the design. After a small adjustment of the mathematic model, the test result of the rod cross section photos fits the simulation well. Then an optical resonant cavity with a Nd: YAG laser rod is set up. The laser with the beam quality near the diffraction limit is obtained. The LD pumping module can be used in high power MOPA laser systems. The improved mathematic model can be used to simulate and design side-pumped lasers in future.
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