论文部分内容阅读
相干半导体激光列阵体积小、重量轻,输出能量密度高,非常适于用作对光源尺寸要求苛刻的航天激光光源。为避免随航天器在轨运行的半导体列阵经受变化梯度剧烈的恒星、行星、空间低温热沉的交替加热和冷却的影响,以便能够正常工作,采用潜望式结构设计,将列阵置于舱内,列阵向航天器外输出激光必须经由舱外输出反射镜完成。然而,舱外输出反射镜受周围热环境影响和列阵输出激光束照射,会产生随机热变形,导致输出舱外的激光能量发散;并且,舱外输出反射镜面热变形导致镜面法向偏转,使得输出光束产生较大的指向偏转误差,这极大地降低了能够作用于目标之上的激光束的能量密度,严重恶化输出舱外的光束质量。通过理论推导结合ANSYS有限元分析软件和相关实验,在研究清楚相干半导体激光列阵作为航天激光源的构造、其光场与周围热环境共同作用于舱外输出反射镜的规律与特点后,给出了航天预失真半导体激光列阵激光源技术,通过回波法适时测量舱外输出反射镜引起的波前畸变,处理器配合D/A和高压放大器,驱动驱动器,使舱内添加的反射镜预失真成形,适时使列阵输出产生预失真波前畸变,以抵消舱外输出反射镜的热变形对输出舱外的激光束的影响。相关系统运行实验结果显示,此技术使半导体激光列阵能够适应宇航环境,向舱外输出保障质量的激光束。
Coherent semiconductor laser arrays are small in size, light in weight and high in output energy density, making them ideal for use as a space laser light source for demanding light source sizes. In order to avoid the effects of alternating heating and cooling of stellar, planetary and space cryogenic heat sinks with varying gradients in order to avoid the semiconductor array in orbit with the spacecraft in order to be able to work properly, a periscope structure design is used to place the array In-cabin and out-of-array laser output to the spacecraft must be accomplished via an outboard exit reflector. However, due to the influence of the surrounding thermal environment and the laser beam output from the array, the output mirror of the cabin will produce random thermal deformation, which will lead to the divergence of the laser energy outside the output cabin. Moreover, the thermal deformation of the output mirror surface causes the normal deflection of the mirror, So that the output beam has a larger pointing deflection error, which greatly reduces the energy density of the laser beam that can act on the target, which seriously deteriorates the beam quality outside the output cabin. Through the theoretical derivation and ANSYS finite element analysis software and related experiments, it is found that the coherent semiconductor laser array as a space laser source structure, its light field and the surrounding thermal environment co-acting on the rules and characteristics of the output mirror outside the cabin, to Out of the space pre-distortion semiconductor laser array laser source technology, timely measurement of the wave front distortion caused by extra-ship output mirror by echo method, the processor with the D / A and high-voltage amplifier, drive the driver, so that the added mirrors Pre-distortion shape, the output of the array in time to produce pre-distortion wavefront distortion to offset the thermal distortion of the output mirror outside the output cabin outside the laser beam. Experimental results show that the system enables the semiconductor laser array to adapt to the aerospace environment, the output of the capsule to ensure the quality of the laser beam.