基于扭转模腔的全固态单纵模拉曼黄光激光器设计  

Design of Single-Longitudinal-Mode Operation in a Solid State Yellow Laser with Twisted-Mode-Cavity

作　　者：李小丽[1] 谈宜东[1] 杨昌喜[1] 张书练[1] 

机构地区：[1]清华大学精密仪器系,北京100084

出　　处：《光学学报》2014年第12期154-159,共6页Acta Optica Sinica

基　　金：国家自然科学基金(61036016)

摘　　要：输出波长在560-590nm的全固态拉曼黄光激光器是近几年兴起的激光器之一。目前,此类激光器内部多模振荡引起的黄光输出谱线单色性较差的问题还没有得到解决。针对这一情况,提出将扭转模腔与拉曼复合腔相结合的新型解决方案,从根本上消除增益介质中空间烧孔效应引起的基频光多模振荡,实现单纵模黄光输出。拉曼复合腔由L型基频光谐振腔与直线型拉曼谐振腔耦合而成,既保证各个非线性变换过程可充分利用腔内的高功率密度,又可相对独立地对不同波长的光路进行优化调节,从而使整个系统实现最佳输出。该设计有助于在全固态拉曼激光器中实现毫瓦量级的单纵模黄光输出,为基于黄激光的生物医疗、钠导星、空间目标识别等系统提供理想的固体黄光光源。All-solid-state yellow Raman lasers working in the spectra range of 560 - 590 nm have promising development in recent years. However, it is still facing the problem of yellow spectrum impurity resulting from the multimode operation within the laser resonator. To solve this problem, a novel design of single-longitudinal-mode yellow Raman laser based on the twisted-mode-cavity combined with Raman couple cavity is proposed. It can suppress the multimode oscillations at the fundamental wavelength caused by the spacial hole burning effect in the laser gain medium, and then realize thesingle-longitudinal-mode operation at the yellow wavelength. The Raman couple cavity consists of a L-shape fundamental resonator and a linear Raman resonator, which can benefit from high intensity of intracavity fields to reduce the laser threshold. It also has advantage of flexible adjustment to optimize different resonators separately for the best laser performance. This design is of practical significance to enable single- lungitudinal-mode yellow laser source with milliwatt output power, which paves the way for applying yellow lasers in biomedicine, laser-guide-star and space target recognition.

关 键 词：激光器 单纵模 全固态黄光激光器 受激拉曼散射 扭转模腔 复合腔 

分 类 号：O436[机械工程—光学工程]