100 m Core Diameter Monolithic Fiber Side-Pumping Coupler
for 10 mJ 10 ns All-Fiber Laser¹

Q. Xiao*, H. Zhang, P. Yan, Y. Wang, J. Hao, and M. Gong*

State Key Laboratory of Tribology, Center for Photonics and Electronics, Department of Precision Instruments,
Tsinghua University, Beijing 100084, China

*e-mail: xiaoqirong08@gmail.com

Received December 26, 2011; in final form, December 29, 2011; published online October 1, 2012

Abstract—In this paper, we report a monolithic fiber side-pumping coupler that allows for very large mode
area double clad fiber designs. This coupler is constituted of a multi-mode pump fiber and a double clad fiber
(DCF). The pump power is coupled to the DCF through the side of DCF. The pump coupling peak power of
163.7 W @ 560 s with the coupling efficiency of 98.0% is achieved, and the signal coupling energy of 10 mJ
@ 10 ns (~1 MW @ 10 ns) with the coupling efficiency of 96.3% is obtained, when the core diameter of the
DCF is 100 m. Furthermore, this side-pumping coupler is successfully applied to a high peak power pulse all-
fiber laser with the output energy of over 10 mJ @ 10 ns.

DOI: 10.1134/S1054660X1211014X

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