基于体布拉格光栅的波束合成技术研究及实现

探讨实现激光波束合成的新方法,分析体布拉格光栅作为激光波束引导器的可行性,基于Kogelnik耦合波理论,着重讨论了影响体布拉格光栅衍射效率的波长选择性和角度选择性因素。实验上给出布拉格光栅的具体制作过程,利用透射式体布拉格光栅完成了2束不同波长的激光并束、2束同种波长的激光并束实验,验证了利用布拉格光栅进行并束的可行性。为了实际中应用的方便,提出在晶体内部利用90°配置设计特定角度的布拉格光栅,让激光垂直照射晶体表面,即可满足布拉格角度入射,改良并束光路,简化理论计算,提高并束效率。

Research and Implementation of Volume Bragg Gratings for Beam Combination

The paper proposes a new approach of beam combination, in which the feasibility of volume Bragg gratings as the laser beam guiding device was analyzed. Based on Kogelnik's theory of coupled waves, the wavelength selectivity and angular selectivity of volume Bragg gratings were emphatically discussed. The experimental fabricating process was reported in detail. Two different wavelength lasers beam combination and two same wavelength lasers beam combination were performed. As a result, the feasibility of Bragg grating for beam combination was verified. In order to be used conveniently in practical operation, the special angle is taken into account. The optical path will be improved and the theoretic calculation also be simplified. The beam combination efficiency will be greatly improved.