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为了优化高功率固体激光装置波前补偿系统的设计方案,基于构型验证装置开展了波前测试和补偿实验。实验结果显示,虽然等效钕玻璃片数大大增加,但由于主放采用了“U”型反转器技术,扣除离焦量后的静态和动态波前与原型装置相比没有显著提高,主要变化为离焦分量。若不采取任何补偿措施,会影响激光在前级滤波器的顺利过孔,造成近场缺光现象。实验中,为保证激光在动态发射时顺利过孔,采用了调节透镜的方式,使激光在各级滤波小孔位置有合适的预留量。同时,利用原型装置现有的小口径变形镜对扣除离焦后的像差进行补偿,减小激光在末级滤波小孔位置的像差。综合上述两种方法,成功解决了近场缺光的问题。针对未来高功率固体激光装置,伴随着光束口径和等效钕玻璃片数的增加,主放大器内的像差也会大幅度增加,采用上述调节透镜的方式可能无法兼顾静态和动态两种状态下的通光问题,需要在主放大系统内增加主动补偿措施,为腔镜变形镜的应用提供了实验依据。
In order to optimize the design of the wavefront compensation system for high power solid-state laser devices, wavefront testing and compensation experiments were carried out based on the configuration verification device. The experimental results show that although the number of equivalent neodymium glasses greatly increased, the static and dynamic wavefront after removing the defocus did not increase significantly compared with the prototype due to the “U” type inverter used in the main amplifier , The main change for the defocus component. If you do not take any compensation measures, it will affect the laser in the smoothing of the pre-filter hole, resulting in near-field lack of light phenomenon. In the experiment, in order to ensure the smooth lasing of the laser during the dynamic emission, the way of adjusting the lens is adopted, so that the laser has a proper reserve for the positions of the filtering holes at all levels. At the same time, the aberration after subtracting defocus is compensated by using the existing small-aperture deforming mirror of the prototype device to reduce the aberration of the laser at the position of the last-stage filtering aperture. The above two methods, the successful solution to the problem of near-field light. For the future high-power solid-state laser devices, along with the increase of the beam diameter and the equivalent number of neodymium glasses, the aberration in the main amplifier will also increase greatly. The above-mentioned adjustment of the lens may not be able to balance static and dynamic states Of the light through the problem, the need to increase the main amplification system to take the initiative to compensate for the application of endoscopic deformable mirror provides an experimental basis.