一种偏振无关的高精度超窄激光线宽测量方法  

A polarization-independent high-precision measurement method for ultra-narrow laser linewidth

作　　者：刘毅[1] 邱硕丰[1] 刘波[1] 林列[1] 

机构地区：[1]南开大学信息技术科学学院,天津300071

出　　处：《光通信研究》2013年第3期45-48,共4页Study on Optical Communications

摘　　要：介绍了一种偏振无关的DSHI(延时自外差法),其光路系统是基于FRM(法拉第旋转镜)的Michelson干涉仪,并对其激光线宽测量原理和偏振无关的特性进行了理论分析。在此基础上分别对传统的M-Z(马赫-曾徳)型DSHI和偏振无关的Michelson型DSHI进行了偏振态稳定性测试和超窄(4.5kHz)激光线宽测量比较,结果表明,具有高偏振态稳定性的Michelson型DSHI对激光线宽的测量精度更高,同时,用该高精度的Michelson型DSHI在理想的精度范围内成功完成了对另一台1.7kHz超窄半导体激光器线宽的测量。A polarization-independent Delayed Self-Heterodyne Interferometer （DSHI） is introduced, the optical system of which is a Faraday Rotator Mirror （FRM）-based Michelson interferometer, and its laser linewidth measurement principle and polari- zation-independent characteristics theoretically analyzed. On this basis, the polarization state stability measurement for the tra- ditional Mach-Zehnder （M-Z） DSHI and the polarization-independent Michelson DSHI are performed respectively and compared with that for the ultra-narrow （4.5 kHz） laser linewidth. The results indicate that the Michelson DSHI with high polarization state stability has a higher accuracy in laser linewidth measurement. Furthermore, by using this type of DSHI, the linewidth measurement for another ultra-narrow semiconductor laser with a linewith of 1.7 kHz is implemented in an ideal range of accu- racy.

关 键 词：线宽测量 迈克尔逊干涉仪 法拉第旋转镜 延时自外差法 

分 类 号：TN248[电子电信—物理电子学]