High conversion efficiency, high power density Q-switched fiber laser

作     者：陈霄 肖起榕 金光勇 闫平 巩马理 

作者机构：Provincial Key Laboratory of Solid Laser Technology and Application College of Science Changchun University of Science and Technolog Center for Photonics and Electronics State Key Laboratory of Tribology Department of Precision Instrument Tsinghua University 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2014年第23卷第6期

页      面：311-314页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0803[工学-光学工程] 0704[理学-天文学] 

基　　金：supported by the National Natural Science Foundation of China(Grant No.61307057) the State Key Laboratory of Tribology,Tsinghua University,China(Grant No.SKLT12B08) China Postdoctoral Science Foundation(Grant Nos.2012M520258 and 2013T60109) 

主　　题：Q-switching wide spectrum fiber lasers laser diode-pumped peak power 

摘      要：An acoustic-optic Q-switched all-fiber laser With a high-repetition-rate, a short pulse width, a wide spectrum, and a high conversion efficiency is experimentally demonstrated. In the laser configuration, a （1＋1）x 1 side-pumping coupler is introduced to perform backward pumping, and a 10/130%tm Yb fiber is adopted. The acoustic-optic component operates in the first direction, achieving a Q-switched pulse with a repetition rate adjustable in the range of 20 kHz-80 kHz. Under a repetition rate of 20 kHz and a pump power of 6.76 W, the fiber laser obtains a highly efficient and stable pulse output, with an average power of 4.3 W, a pulse width of 56 ns, a peak power of 3.83 kW, and a power density of 1.39x 101~ W/cm2. Particularly, the optic-optic conversion efficiency of the laser reaches as high as 64%. Another feature of the pulsed laser is that the high reflection mirror reflects the pump light as well, which brings the secondary absorption of the pump power into the gain fiber.