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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59MHz的1064nm锁模径向偏振光。
According to the difference between the radial and tangential thermal focal lengths under the Nd: YAG crystal side-pumped and the mode-locked condition of the SESAM, the Nd: YAG four-mirror-folded SESAM is pumped by the side of the laser diode (LD) Lock cavity, in the cavity without polarization under the conditions of selected devices, to achieve a mode-locked radial polarized light output. The relationship between the radial polarization state and the angularly polarized light spot size and the pumping current was simulated and the condition for achieving the stable mode-locking of the SESAM was given. By placing the aperture with the proper aperture, the maximum output power of 13 W, 1064nm mode-locked radial polarized light with polarization purity greater than 92% and repetition frequency of 59MHz.