体布拉格光栅色散对衍射光束质量的影响

发布时间：2018-06-21 09:04

本文选题：光栅 + 体布拉格光栅　；参考：《中国激光》2017年02期

【摘要】：基于衍射理论,建立了光束经过体布拉格光栅衍射的光束质量分析模型。在考虑入射光束参数和体布拉格光栅参数的情况下,分析任意光束经过体布拉格光栅衍射的光场分布,计算得到二阶矩意义下的束腰和光束质量M2因子,并分析了体布拉格光栅空间周期、入射光束尺寸、光谱线宽和初始入射光束质量M2对衍射光束质量的影响。研究结果表明,衍射光束质量受体布拉格光栅和入射子束共同影响:体布拉格光栅周期越小,其空间色散越严重;入射子束尺寸越大、光谱线宽越宽、初始光束质量越差,衍射后的输出光束质量劣化越明显。该模型给出了衍射后的光束质量表示,可方便快捷地得到不同输入光束衍射后的光束质量。在最高入射功率达千瓦量级时,实验测量了初始M2和光谱线宽两部分贡献对衍射光束质量的结果,并与相应理论分析进行了比较。
[Abstract]:Based on the diffraction theory, the beam quality analysis model of the beam passing through the Prague grating diffraction is established. Considering the incident beam parameters and the parameters of the body of the Prague grating, the distribution of the light field in the diffraction of an arbitrary beam through the body of the Prague grating is analyzed. The M2 factor of the beam waist and the beam mass under the meaning of the two order moment meaning is calculated, and the analysis is made. The effect of the space cycle of the body of Prague grating, the incident beam size, the spectral line width and the initial incident beam quality M2 on the quality of the diffracted beam. The results show that the diffraction beam quality receptor Prague grating and the incident beam are influenced jointly by the smaller the period of the body of the Prague grating, the more the space dispersion is, the larger the incident beam size, the spectral line. The wider the width is wider, the worse the initial beam quality is, the worse the quality of the output beam after diffraction is worse. The model gives the beam quality after diffraction, which can conveniently and quickly get the beam quality after diffraction of different input beams. When the maximum incident power reaches the kilowatt order, the experiment measured the initial M2 and the spectral line width by two contributions to the diffraction. The results of beam quality are compared with the corresponding theoretical analysis.
【作者单位】：中国工程物理研究院激光聚变研究中心;
【基金】：国家自然科学基金(11474257);国家自然科学基金青年基金(11404305)
【分类号】：TN248;TN25

【相似文献】