中国激光, 2014, 41 (1): 0102006, 网络出版: 2013-12-25
侧面抽运Nd:YAG锁模径向偏振光
Side-Pumped Nd:YAG Mode-Locked Radially Polarized Laser
激光器 全固态激光 径向偏振 YAG锁模 热焦距 lasers all-solid-state laser radial polarization YAG mode-locked thermal focal length
摘要
根据Nd:YAG晶体侧面抽运下径向和切向热焦距的不同，以及半导体可饱和吸收镜(SESAM)被动锁模条件，利用激光二极管(LD)侧面抽运Nd:YAG四镜折叠SESAM被动锁模腔，在腔内无偏振选择器件条件下，实现锁模径向偏振光输出。模拟计算了径向偏振态和角向偏振态光斑大小与抽运电流之间的关系，分析给出了实现SESAM稳定锁模的条件，通过放置适当孔径的光阑，获得了最大输出功率为13 W、偏振态纯度大于92%、重复频率为59 MHz的1064 nm锁模径向偏振光。
Abstract
A mode-locked radially polarized laser is generated based on the difference of thermal focal length in side-pumped Nd:YAG and the condition of mode-locking by the semiconductor saturable absorption mirror (SESAM). The spot size of radial polarization and azimuthal polarization with different pumping currents, and the parameters of the LD side-pumped Nd:YAG four-mirror-folded passively mode-locked cavity are analyzed. The maximum output power of 13 W with the frequency of 59 MHz and the wavelength of 1064 nm is acquired. We demonstrate that the purity of the radially polarized beam is more than 92%.
李政委, 陈檬, 李港. 侧面抽运Nd:YAG锁模径向偏振光[J]. 中国激光, 2014, 41(1): 0102006. Li Zhengwei, Chen Meng, Li Gang. Side-Pumped Nd:YAG Mode-Locked Radially Polarized Laser[J]. Chinese Journal of Lasers, 2014, 41(1): 0102006.
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