相移反射体布拉格光栅在谱合成中的应用  

Spectral Beam Combining by Phase-Shifted Reflective Volume Bragg Gratings

作　　者：沈本剑[1] 郑光威[2] 谭吉春[1] 何焰蓝[1] 刘莉[2] 

机构地区：[1]国防科学技术大学理学院,湖南长沙410073 [2]国防科学技术大学光电科学与工程学院,湖南长沙410073

出　　处：《中国激光》2010年第12期3056-3059,共4页Chinese Journal of Lasers

基　　金：国家自然科学基金委员会与中国工程物理研究院联合基金[NSAF(10676038)]资助课题

摘　　要：谱合成是获得高功率激光输出的有效方法。建立相移反射体布拉格光栅谱合成模型,利用传输矩阵法,分析相移反射体布拉格光栅的衍射特性,并对反射体布拉格光栅的衍射特性和相移反射体布拉格光栅的衍射特性进行了比较。以两束光为例,分析相移反射体布拉格光栅谱合成特性,分析在高斯单色平面波入射条件下,光谱宽度对谱合成效率的影响。结果表明,通过在反射体布拉格光栅中引入π/2的相位畸变,可有效抑制衍射效率中的旁瓣的影响并增加参与谱合成的光束数目,对于两束光谱间距为30 pm的窄带光束谱合成,谱合成效率可达97%。It is an effective approach to obtain high power laser beam output by spectral beam combining.The model of spectral beam combining using phase-shifted reflective volume Bragg gratings is established,and the diffraction characteristic is analyzed by transfer matrix method.The diffraction characteristics of reflective volume Bragg grating and phase-shifted reflective volume Bragg grating are compared.Taking the spectral beam combining of two beams by phased-shifted reflective volume Bragg gratings as an example,the effects of Gaussian monochromatic beam′s spectrum width on combining efficiency are analysed.The results show that the side-lobe of diffraction efficiency can be eliminated and the channel number can be increased by phase-shifted reflective volume Bragg gratings,and the combining efficiency can be more than 97% when the spectral beam combines of two beams with a spectral separation of 30 pm.

关 键 词：激光技术 谱合成 传输矩阵 相移体布拉格光栅 

分 类 号：O436.1[机械工程—光学工程]