808 nm与888 nm抽运Nd∶YVO<sub>4</sub>热效应分析

根据Nd∶YVO4晶体对808 nm和888 nm波长抽运光吸收特性的差异，模拟了两种波长抽运下晶体的温度分布、应力分布以及当抽运光在a轴和c轴上的偏振分量变化时，晶体在两种波长抽运下温度分布以及热焦距的变化。模拟结果表明，888 nm抽运下，Nd∶YVO4晶体在径向温度梯度大幅度减小，晶体温度应力值远小于808 nm抽运；并且Nd∶YVO4的a轴与c轴对888 nm光吸收系数相同，使得晶体的吸收不受抽运光偏振变化的影响，从而使得谐振腔和输出的激光功率更加稳定。采用888 nm抽运，是降低Nd∶YVO4晶体热效应和提高Nd∶YVO4激光器输出功率的有效途径之一。

Abstract

Temperature and stress distribution of Nd∶YVO4 crystal are simulated according to the difference of optical absorption properties of Nd∶YVO4 crystals pumped by 808 nm and 888 nm, respectively. The changes of crystal temperature distribution and thermal focal length are also simulated when the pumping beam polarization components in a-axis and c-axis are changed. From simulation results, the crystal temperature gradient with 888 nm pump-wavelength is one sixth than that of 808 nm and the crystal temperature stress value is much less than that of 808 nm pump-wavelength. The resonator and output power are not affected by the change of pumping beam’s polarization because the light absorption coefficients on a-axis and c-axis of Nd∶YVO4 are the same when pump wavelength is 888 nm. This is one of the effective ways to reduce Nd∶YVO4 crystals thermal effect and increase Nd∶YVO4 laser power with 888 nm pump-wavelength.

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艾庆康, 常亮, 陈檬, 李港, 麻云凤, 樊仲维, 牛岗, 余锦, 康文运, 贺凯. 808 nm与888 nm抽运Nd∶YVO₄热效应分析[J]. 中国激光, 2011, 38(4): 0402001. Ai Qingkang, Chang Liang, Chen Meng, Li Gang, Ma Yunfeng, Fan Zhongwei, Niu Gang, Yu Jin, Kang Wenyun, He Kai. Thermal Analysis of Nd∶YVO₄ Pumped by 808 nm and 888 nm[J]. Chinese Journal of Lasers, 2011, 38(4): 0402001.

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