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为了实现4%取样后对剩余激光高达109倍的吸收,给出一种光束吸收器的设计方法,推导了光束从进入吸收器到离开吸收器全过程中所对应的各种角度关系,包括入射光线与吸收器交点的夹角、光线从入射变为出射的翻转临界角、出射光线与吸收器交点的夹角、光线离开吸收器临界角等角度关系。进而计算出光线在与吸收器的每一个交点处的取样率,得到光束从进入吸收器到离开吸收器全过程的衰减倍率。以此设计一种光束吸收器并在软件中进行光线追迹分析,结果表明该吸收器的吸收倍率高达1011,满足激光吸收倍率要求并且和理论计算结果吻合;据此理论设计的实物吸收器也在激光系统中得到良好应用,得到调制度M<1.2和对比度C<0.07的近场图像,说明该设计方法是合理的。
In order to achieve up to 109-fold absorption of the remaining laser after 4% sampling, a design method of a beam absorber is given, and various angles corresponding to the whole process from entering the absorber to leaving the absorber are deduced. Including the incident The angle between the intersection of light and the absorber, the critical angle of turning of the light from incident to exit, the angle between the exit point of the light and the absorber, and the angle between the light and the critical angle of the absorber. Then the sampling rate of the light at each intersection with the absorber is calculated to obtain the attenuation magnification of the light beam from entering the absorber to leaving the absorber. In this way, a beam absorber is designed and the ray tracing analysis is performed in the software. The results show that the absorption rate of the absorber is as high as 1011, which meets the requirement of laser absorption magnification and coincides with the theoretical calculation. The physical absorber designed according to the theory It is well applied in laser system and the near-field image with modulation degree M <1.2 and contrast C <0.07 is obtained, which shows that the design method is reasonable.