被动调Q双波长Yb∶YAG板条激光的偏振控制  

Polarization Control in Passively Q-Switched Dual-Wavelength Yb:YAG Slab Laser

作　　者：张锋宸 惠沉林 王丹利 廖洪林 林志立[1] 苏少坚[1] 庄凤江[1] Zhang Fengchen;Hui Chenlin;Wang Danli;Liao Honglin;Lin Zhili;Su Shaojian;Zhuang Fengjiang(College of Information Science and Engineering,Huaqiao University,Xiamen,Fujian 361021,China)

机构地区：[1]华侨大学信息科学与工程学院,福建厦门361021

出　　处：《光学学报》2022年第8期161-166,共6页Acta Optica Sinica

基　　金：国家自然科学基金(61505058);福建省自然科学基金(2020J01062);厦门市青年创新基金(3502Z20206013)。

摘　　要：采用激光二极管(LD)来泵浦Yb∶YAG板条晶体被动调Q双波长激光器,开展可控激光输出偏振态的实验研究。实验搭建紧凑的V型谐振腔,通过调节输出镜(OC)的倾角可以实现激光输出从0°水平线偏振到90°垂直线偏振的切换。通过实验设计可以得出最终的输出偏振态取决于腔内的附加相位差,当腔内附加相位差为π时,输出偏振由水平偏振向垂直偏振切换。实验结果表明:当OC倾角的变化量约为3.6 mrad时,线偏振态从水平偏振切换至垂直偏振,水平线偏振的消光比最优为28.98 dB,垂直线偏振的消光比最优为25.96 dB;在泵浦功率为18.42 W时,获得了1.66 W的平衡双波长激光输出,对应的脉冲宽度为42.6 ns。The laser diode(LD)is used to pump the passively Q-switched dual-wavelength laser with Yb:YAG slab crystal,and the experimental study of controllable laser output polarization is carried out.A compact V-shaped resonator is built in the experiment,and the laser output can be switched from 0°horizontal polarization to 90°vertical polarization by adjusting the inclination of the output mirror(OC).Through the experimental design,it can be concluded that the final output polarization depends on the additional phase difference in the cavity.When the additional phase difference in the cavity isπ,the output polarization changes from horizontal polarization to vertical polarization.The experimental results show that when the change of OC inclination angle is about 3.6 mrad,the linear polarization is switched from horizontal polarization to vertical polarization,the optimal extinction ratio of horizontal and vertical polarization is 28.98 dB and 25.96 dB,respectively.When the pump power is 18.42 W,a balanced dual-wavelength laser output of 1.66 W and the corresponding pulse width of 42.6 ns are obtained.

关 键 词：激光器 被动调Q 板条激光 偏振控制 双波长输出 

分 类 号：O436[机械工程—光学工程] TN248.1[理学—光学]