摘要
We present an all-fiber 1.94μm nanosecond pulse laser in master oscillation-power amplifier configuration.A dual-FBGs gain-switched Tm^(3+)-doped fiber laser is built and is used as the seed laser.The output characteristics of the amplifier are studied at different pulse repetition rates,and the maximum output energy of 500μJ is achieved under incident pump power of 39 W.The emitting spectra are checked at 5 and 10 kHz,and no obvious nonlinear effects are observed in the spectrum of the amplified laser.The beam quality factor is M^(2)=2.1±0.03 measured by the traveling knife-edge method,and the laser beam spot is also monitored by an infrared vidicon camera.
基金
the National Natural Science Foundation of China under Grant Nos 60878011 and 61078008
the Program for New Century Excellent Talents in University under Grant No NCET-10-0067.
