摘要
BBO晶体是一种被广泛应用于激光倍频、混频、光参量振荡等光学领域的非线性频率变换晶体。但是由于该晶体在四倍频过程中具有较大的走离角,会使产生的倍频光与基频光逐渐分开,降低了四倍频转换效率。文章模拟了在532~266nm倍频过程中,入射光斑形状为圆形和矩形时对BBO晶体四倍频效率的影响。计算结果表明,采用矩形光斑入射到BBO晶体表面可以延长有效倍频孔径长度,减小走离效应对倍频光的影响,明显提升四倍频效率。
The BBO crystal is a non-linear frequency conversion crystal that is widely used in optical fields such as laser frequency doubling,frequency mixing and optical parametric oscillation.However,due to the large departure angle of the crystal during the quadrupling process,the resulting frequency doubled light is gradually separated from the fundamental frequency light,which reduces the quadrupling efficiency.The effect of the incident spot shape on the quadrupling efficiency of the BBO crystal is simulated for both circular and rectangular shapes during the 532~266 nm frequency doubling process.The results show that the use of a rectangular spot incident on the surface of the BBO crystal can extend the effective doubling aperture length,reduce the effect of the walk-off effect on the doubling light and significantly improve the quadrupling efficiency.
作者
孟诗涵
臧天元
蒋剑良
张恒利
MENG Shihan;ZANG Tianyuan;JIANG Jianliang;ZHANG Hengli(Solid State Laser Laboratory,School of Optoelectronics,Beijing University of Technology,Beijing 1ooo8l,China)
出处
《光学技术》
CAS
CSCD
北大核心
2024年第3期305-308,共4页
Optical Technique
关键词
矩形光斑
走离效应
紫外激光
非线性光学
四倍频
rectangular spot
walk-off effect
ultraviolet laser
non-linear optics
FHG
作者简介
孟诗涵(1998-),女,硕士研究生,从事固体激光技术研究。msh1272244173@163.com;通讯作者:张恒利(1968-),男,教授,博士,从事固体激光技术研究。zhl040325@bit.edu.cn。
