偏斜光线抽运下回音壁模式光纤激光辐射的偏振特性  

Polarization Properties of a Whispering-Gallery-Mode Fiber Laser Pumped by the Evanescent Wave of Skew Beam

作　　者：冯永利[1] 韩德昱[1] 普小云[1] 祝昆[1] 江楠[1] 

机构地区：[1]云南大学物理系,云南昆明650091

出　　处：《中国激光》2010年第3期627-630,共4页Chinese Journal of Lasers

基　　金：国家自然科学基金(60877037;10564005)资助课题

摘　　要：研究了消逝波激励的回音壁模式(WGM)光纤激光器的偏振特性。实验发现,在抽运光以偏斜光线方式沿光纤的近轴向抽运时,回音壁模式激光既存在横电(TE)波又存在横磁(TM)波;对径向模式数(l)和角模式数(n)相同的回音壁模式,TE波和TM波之间的波数差随增益包层溶液折射率的增加而单调地减小。根据消逝波激励的WGM光纤激光的激励机制,结合圆柱型微腔中确定WGM共振位置的解析渐近公式,合理地解释了观察到的实验结果。The polarization properties of a whispering-gallery-mode（WGM） fiber laser pumped by the evanescent wave of skew beam are studied.It is found from the experiments that when pump beam transmits in a bared optical fiber in skew way,both transverse electric（TE） wave and transverse magnetic（TM） wave exist in the laser emission,and the wave-number difference between TE and TM waves decreases monotonely with the increase of the refractive index of cladding solution.Based on the excitation mechanics of evanescent-wave pumped WGM fiber laser and the analytic asymptotic formula to determine the resonant positions of a WGM,the observed experimental results are well explained.

关 键 词：光纤激光器 回音壁模式 消逝波激励 横电波和横磁波 

分 类 号：TN248.33[电子电信—物理电子学] O433.3[机械工程—光学工程]