一种制作掺Yb相移光纤光栅激光器的实验方案  

Fabrication of Yb-Doped Phase-Shifted Fiber Grating Laser

作　　者：王利[1] 陈柏[1] 陈嘉琳[1] 常丽萍[1] 李国扬[1] 孙安[1] 林尊琪[1] 

机构地区：[1]中国科学院上海光学精密机械研究所高功率激光物理联合实验室,上海201800

出　　处：《中国激光》2007年第12期1617-1620,共4页Chinese Journal of Lasers

基　　金：国家863计划(842010)资助项目

摘　　要：采用遮挡法引入相移制作了掺Yb相移光纤光栅（PS-FBG）。在制作光栅的过程中，将其作为激光器的谐振腔，通过监测激光器的输出功率来确定相移大小。当激光器的输出功率开始下降时，停止曝光，此时引入的相移为π／2。为了使光栅的特性尽快稳定下来需要对光栅进行退火，这将导致引入的相移小于π／2。为了弥补退火过程中引起的相移降低，需要对退火后的光栅进行二次曝光，以使光栅的相移恢复π／2。利用该方法制作了一只光纤光栅激光器。当抽运功率为100mw时，获得了25mw的输出功率，信噪比（SNR）为60dB。在1h内，输出功率波动小于1％。当光栅的温度在25～30℃之间变化时，激光器单纵模运转。Yb-doped phase-shifted fiber Bragg grating （PS-FBG） has been fabricated with phase shift introduced by shielded method. In the fabrication process, the PS-FBG is used as the laser cavity. Whether the introduced phaseshift is π/2 or not is determined by the laser output power. As long as the output power of the laser begins to drop down, the exposure is stopped, and the phase shift is π/2 then. It is necessary to anneal the PS-FBG to stabilize its characteristics, which will reduce the introduced phaseshift. The second exposure of the PS-FBG is needed to restore the π/2 phase shift. A fiber grating laser has been made with the method. When the pump power is 100 mW, the laser output is 25 mW with signal-noise-ratio （SNR） of 60 dB. Within 1 h the output fluctuation of the laser is less than 1% The laser is always under single-mode operation when the temperature of the fiber grating is tuned between 25℃ and 30℃.

关 键 词：激光技术 相移光纤光栅 遮挡法 掺Yb光纤 

分 类 号：TN248.1[电子电信—物理电子学] TN253