中国激光, 2017, 44 (2): 0201019, 网络出版: 2017-02-22   

体布拉格光栅色散对衍射光束质量的影响 下载: 680次

Effect of Volume Bragg Gratings Dispersion on Diffracted Beam Quality
作者单位
中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900
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, an analytical model for the beam quality after the beam passing through volume Bragg grating (VBG) is built. Considering the parameters of input beam and VBGs, the optical field distribution of an arbitrary beam passing through VBG after diffraction is analyzed,and the beam waist in second moment definition and the beam quality parameter of M2 can be calculated. The effect of space period of VBGs, input beam size, spectral bandwidth and initial input beam quality M2 on the diffraction beam quality are analyzed. The results show that the diffracted beam quality is influenced by the VBGs and the input sub-beam commonly. The spatial dispersion becomes larger with the decrease of period of VBGs, and the output beam quality after diffraction deteriorates significantly with the increase of input sub-beam size, spectral bandwidth and the initial beam quality. The model gives the analytical formula for the beam quality after diffraction, which can be used to obtain the beam quality after diffraction for different input beams easily and quickly. At the maximum input power of kilowatt level, the contribution of the initial M2 and the spectral line width to the diffracted beam quality is measured, and it is compared with the corresponding theoretical analysis.

周泰斗, 梁小宝, 赵磊, 王琳, 李超, 罗韵, 王建军, 景峰. 体布拉格光栅色散对衍射光束质量的影响[J]. 中国激光, 2017, 44(2): 0201019. Zhou Taidou, Liang Xiaobao, Zhao Lei, Wang Lin, Li Chao, Luo Yun, Wang Jianjun, Jing Feng. Effect of Volume Bragg Gratings Dispersion on Diffracted Beam Quality[J]. Chinese Journal of Lasers, 2017, 44(2): 0201019.

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