Experimental study of high power pulse fiber laser based on gain-switched LD

Experimental study on all-fiber high power pulse fiber laser based on 1064 nm gain-switched laser diode is reported. The method of tri-stage cascade amplification is employed in the experimental. The first stage amplification is single-mode ytterbium-doped fiber,and gain medium of the second and third stage amplification is double-cladding fiber. Average power of 25. 3W is obtained under a maximum 45. 2 W pump power,and the optical-optical efficiency is 55. 9%. The pulse width is 223 ps with center wavelength of 1064 nm. No nonlinear effect is observed by spectrometer,and the SNR is beyond 30 dB. A higher power laser output can be realized as the pump power is further enhanced.