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

doi:10.1088/1674-1056/23/6/064218

Abstract 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)×1 side-pumping coupler is introduced to perform backward pumping, and a 10/130-um 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 1.39×10¹⁰ 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.

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

Received: 21 August 2013
Revised: 20 November 2013
Accepted manuscript online:

PACS:	42.60.Gd	(Q-switching)
	42.55.Wd	(Fiber lasers)
	42.55.Xi	(Diode-pumped lasers)

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

Corresponding Authors: Gong Ma-Li
E-mail: gongml@mail.tsinghua.edu.cn

Cite this article:

Chen Xiao (陈霄), Xiao Qi-Rong (肖起榕), Jin Guang-Yong (金光勇), Yan Ping (闫平), Gong Ma-Li (巩马理) High conversion efficiency, high power density Q-switched fiber laser 2014 Chin. Phys. B 23 064218

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