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利用二元光学元件微型化和对波面进行任意整形的特点,将二元光学衍射器件用于高功率激光二极管阵列光束的快、慢轴准直,并结合空心导管设计一种衍射/反射混合型光束整形系统,用于实现高密度、高均匀性LD泵浦源。应用时域有限差分法(FDTD)的严格矢量分析表明:所设计的二元光学准直器性能优良,准直后光束发散角在误差范围内接近衍射极限,慢轴方向衍射效率为82.21%,快轴方向为75.76%。模拟设计的结果表明:采用这种衍射/反射光束整形技术的高密度泵浦源能获得高功率密度和高均匀性的抽运光束,在空心导管出射端面附近光强起伏RMS<1%,并且在光束的准直性能和系统紧凑性方面优于传统整形方法。
The binary optical diffraction device is used for the fast and slow axis collimation of the high power laser diode array beam with the help of the miniaturization of the binary optical element and the arbitrary shaping of the wave surface. A diffractive / reflective hybrid Beam shaping system for high density, high uniformity LD pump sources. The rigorous vector analysis using finite difference time domain (FDTD) method shows that the designed binary optical collimator has excellent performance and the divergence angle of the collimated beam approaches the diffraction limit within the error range. The diffraction efficiency in the slow axis direction is 82.21% The fast axis is 75.76%. Simulation results show that a high-density pumping source using this diffractive / reflected beam shaping technique can obtain a pumped beam of high power density and high uniformity with a RMS <1% fluctuation near the exit end of the hollow catheter and It is superior to traditional shaping methods in the collimation performance and system compactness of light beams.