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为了优化以半导体激光器为光源的激光多普勒测速仪(LDV)的光路,基于半导体激光器的非对称结构,建立了参考光为像散椭圆高斯分布,信号光为圆形艾里分布的相干探测模型,理论分析了椭圆率、像散等参数对外差干涉效率和探测器接收的参考光功率的影响。结果表明,外差干涉效率和参考光功率均随椭圆率的增加而减少,并且外差干涉效率随像散的增加进一步降低,因此,半导体激光器的非对称结构会导致探测器输出减小,破坏系统信噪。在此基础上提出了双柱透镜系统对光束进行整形以降低半导体激光器的非对称结构对探测器输出的不利影响。
In order to optimize the optical path of a laser Doppler velocimeter (LDV) using a semiconductor laser as a light source, based on the asymmetric structure of a semiconductor laser, a coherent detection system is established, in which the reference light is an elliptic Gaussian distribution and the signal light is a circular Erie distribution Model, theoretical analysis of ellipticity, astigmatism and other parameters on the heterodyne interference efficiency and the detector receives the reference light power. The results show that both the heterodyne interference efficiency and the reference optical power decrease with the increase of ellipticity, and the heterodyne interference efficiency decreases with the increase of astigmatism. Therefore, the asymmetric structure of the semiconductor laser will lead to the decrease of the detector output and the destruction System signal noise. On this basis, the double-column lens system is proposed to shape the light beam to reduce the adverse effect of the asymmetric structure of the semiconductor laser on the detector output.