Compact air-cooling all-solid-state lasers are important in laser distance measurement, laser remote sensing detection, and scientific research. A compact 808nm LD-pumped Nd:YVO4 laser with a compact air-cooling heat dissipation structure is designed, and the temperature field under high and low temperature operating conditions is simulated. The results indicate that the proposed structure is capable of meeting the heat dissipation requirements during the operation of the laser within an ambient temperature range of -10°C to 40°C. The temperatures of the Nd:YVO4 crystal and the pump source are maintained at 20°C-25°C, ensuring stable operation.
Small size, high-brightness fiber-coupled laser modules have always been the ultimate goal that all researchers are pursuing. A high-brightness 525 nm wavelength fiber-coupled system is designed and evaluated. Based on a multichip 2D green laser diode array, fast-axis collimators are set inside the light source, and a beam shaping system that can rearrange the beam and improve the beam quality in both axes is designed. The simulation results indicate that 24 single emitters are coupled into a 50μm / 0.15 NA optical fiber successfully and the output power is 22.55 W. The brightness of 16.25 MW / ( cm2 · sr ) is calculated with fiber coupling efficiency is 97%.
In this paper, an integrated semiconductor disc laser is designed with the integrated design of the laser source, optical system and heat sink system. The 808 nm VCSEL array is used as the pump source and the Nd:YVO4 crystal is used as the gain medium. The pump source and the gain medium are placed on the same substrate, and both of them share a common cooling system. The collimating optical system of the VCSEL array and the reflective focusing optical system are designed using ZEMAX software, and the focusing spot radius is 1.3 mm, which matches with the theoretical calculation of the crystal pump spot size. The feasibility of integrating the pump source and gain medium in a same cooling system is analyzed using Flow Simulation and ANSYS software, and an air-cooled thermal system is designed by comparing the thermal simulation results of the water-cooling method for verification. Realization of opticalmechanical thermal integration design.
This paper proposes a multi-stage cooling system based on TEC (Thermo Electric Cooler), vapor chamber, heat sink and fan for the high power compact laser diode in the high temperature and mobility environment. Using Flow Simulation and ANSYS software, the temperature field and thermal stress of the multi-stage cooling system under steady state are discussed respectively, and the multi-stage cooling system model is optimized according to the two simulation results and the physical test is carried out. The results show that the designed cooling system can achieve a continuous and stable output of more than 70W from the laser at both room temperature of 20°C and high temperature of 55°C.
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