中国激光, 2017, 44 (10): 1001003, 网络出版: 2017-10-18   

基于高圆度微球腔选模的单纵模窄带光纤激光器 下载: 739次

Single-Longitudinal-Mode Narrow Linewidth Fiber Lasers Using High Roundness Microsphere as Mode Selector
作者单位
南京邮电大学先进光子技术实验室, 江苏 南京 210023
摘要
提出了一种基于高圆度微球腔选模的双环腔光纤激光器。通过改进熔融加热和表面洁净化处理工艺, 获得了高圆度、高Q值微球腔, 利用二维可视的三维高精度耦合系统实现锥形光纤-微球腔的高效率耦合。通过优化入射光偏振态和锥形光纤直径, 获得了耦合效率为99.5%, 3 dB带宽为1 pm, 边模抑制比为14.5 dB的窄带回音壁模(WGM)共振谱。将高效耦合的锥形光纤-微球腔作为光纤子环腔选模单元, 获得了3 dB带宽小于0.01 nm, 边摸抑制比为40 dB, 稳定无跳模的单纵模窄带激光输出。
Abstract
A double-ring cavity fiber laser based on a high roundness microsphere cavity as the single-longitudinal-mode selector is proposed. By the improvement of the melt heating technology and surface cleaning process, microsphere cavities with high roundness and high Q are obtained. We achieve highly efficient coupling between the tapered fiber and the microsphere cavity by using a two-dimensional visual and three-dimensional high-precision coupling system. Through optimizing the polarization of incident light and the diameter of tapered fiber, we obtain whispering gallery mode (WGM) resonance spectrum with coupling efficiency of 99.5%, a 3 dB bandwidth of 1 pm and a side-mode-suppression-ratio (SMSR) of 14.5 dB. The proposed fiber laser produces narrow bandwidth laser spectra with a 3 dB linewidth less than 0.01 nm, a SMSR of 40 dB and a high stability without mode-hopping.

万洪丹, 丁佐芹, 汪杰, 刘琳倩, 张祖兴. 基于高圆度微球腔选模的单纵模窄带光纤激光器[J]. 中国激光, 2017, 44(10): 1001003. Wan Hongdan, Ding Zuoqin, Wang Jie, Liu Linqian, Zhang Zuxing. Single-Longitudinal-Mode Narrow Linewidth Fiber Lasers Using High Roundness Microsphere as Mode Selector[J]. Chinese Journal of Lasers, 2017, 44(10): 1001003.

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