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.
KEYWORDS: Semiconductor lasers, Optical fibers, Mirrors, Ray tracing, Collimation, Laser systems engineering, Optical simulations, High power fiber coupled lasers, Thermal analysis, High power diode lasers
As a pump source for Ti: Sapphire solid-state lasers, the fiber-coupled green diode laser module is critical. However, existing study findings are insufficient to meet the demands of high brightness diode laser pump sources. In this paper, a high brightness green diode laser fiber-coupled system based on TO-can diode lasers is designed. The FACs are installed within the TO-can diode lasers. The optical step as the spatial beam combining system is made up of the HR mirror and the optical wedge. We discussed the relationship between the reflected beam deflection angle and the optical wedge surface inclination angle under the condition of different HR mirror inclination angles. After that, a strategy with appropriate heat dissipation effect is obtained through thermal simulation. Finally, the simulation results verify that couple 18 TO-can single emitters into a 50μm core diameter and 0.22 numerical aperture optical fiber with an output power of 16.9W, the fiber coupling efficiency is 98%. The brightness is 5.66 MW/(cm2·Sr) and the module dimension is L 220mm×W 80mm×H 45mm.
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