An injection-locked fiber laser is introduced to the passive fiber laser coherent beam combination with all-optical feedback loop. A coherent beam combining system with two-dimensional four Yb-doped fiber amplifier chains is established, and the injection-locked fiber laser works as a switchable seed source. The 1064 nm output laser of the injection-locked fiber laser is extinguished automatically as the feedback injection power is high enough, and the injection-locked fiber laser acts as an amplifier for the feedback laser with 7.4 dB gains. We find that the phase-locked far-field interference pattern of our system with seed laser extinguished is stable, and the visibility is up to 91.5%, which is slightly higher than the prevalent method with auxiliary seed laser (88.2%).
© 2013 Optical Society of America
Lasers and Laser Optics
Original Manuscript: November 13, 2012
Revised Manuscript: December 30, 2012
Manuscript Accepted: February 7, 2013
Published: March 11, 2013
Yifeng Yang, Man Hu, Bing He, Jun Zhou, Houkang Liu, Shoujun Dai, Yunrong Wei, and Qihong Lou, "Passive coherent beam combining of four Yb-doped fiber amplifier chains with injection-locked seed source," Opt. Lett. 38, 854-856 (2013)