部分相干双曲余弦-高斯光束的传输特性和空间整形  

Propagation properties and spatial shaping of partially coherent cosh-Gaussian beams

作　　者：李长伟[1] 吕百达[1] 

机构地区：[1]四川大学激光物理与化学研究所,成都610064

出　　处：《强激光与粒子束》2007年第10期1589-1593,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金资助课题(10574097)

摘　　要：通过加入高斯项的空间相干度,引入部分相干双曲余弦-高斯(ChG)光束,推导出部分相干ChG光束通过近轴ABCD光学系统传输的解析表达式,并用以研究其传输特性和空间整形。结果表明,部分相干ChG光束的光强分布不能保持传输不变性,其光强分布不仅与传输距离和离心参数有关,而且还与空间相干参数有关。在传输距离固定时,适当改变部分相干ChG光束的离心参数和空间相干参数,可实现光束的空间整形。光束质量因子随空间相干性的增大和离心参数的减小而减小。高斯-谢尔模型光束和完全相干ChG光束可作为部分相干ChG光束的特例处理。A partially coherent cosh-Gaussian （ChG） beam is introduced by means of adding a Gaussian term of the spatial degree of coherence. The analytical expression for partially coherent ChG beams propagating through a paraxial optical ABCD system is derived and used to study their propagation properties and spatial shaping. The intensity profile of partially coherent ChG beams can not remain unchanged upon propagation and depends on the propagation distance and decentered parameter, and on the spatial coherence parameter. By suitable variation of the decentered parameter and the spatial coherence parameter of partially co- herent ChG beams at a fixed propagation distance, the spatial beam is shaped. The beam quality factor of partially coherent ChG beams decreases with increasing spatially coherence and decreasing decentered parameter. The Gaussian Schell-model beam and fully coherent ChG beams can be treated as special cases of partially coherent ChG beams.

关 键 词：部分相干双曲余弦-高斯(ChG)光束 光束空间整形 传输特性 光束质量因子 

分 类 号：O435[机械工程—光学工程]