We demonstrate an all fiber picosecond laser with megawatt-level peak power based on highly ytterbium-doped phosphate fiber. The phosphate fiber used in the power amplifier stage has the cladding absorption 50 dB/m at 976 nm. The length of the gain fiber in the main amplifier is only 34 cm, which will effectively reduce the nonlinear effect during the process of picosecond pulse amplification. The core diameter of the gain fiber is 25 μm with numerical aperture of 0.04, which is helpful to obtain high beam quality laser. The pulse energy of the seed is 0.2 μJ at repetition rate of 25 kHz, which is amplified to 21 μJ with the pulse width of 20 ps and the peak power is 1.05 MW. High beam quality is also demonstrated with M2 factor measured at highest pulse energy of 1.4 in the both X and Y directions. This kind of laser source with high peak power and high beam quality has a wide range of applications in the field of material processing.
Wei Shi, Zhenhua Yu, Xinzheng Dong, Huixian Liu, Arturo Chavez-Pirson, and Nasser N. Peyghambarian, "High power all fiber-based ultrafast lasers (Conference Presentation)," Proc. SPIE 10083, Fiber Lasers XIV: Technology and Systems, 100831J (Presented at SPIE LASE: February 02, 2017; Published: 21 April 2017); https://doi.org/10.1117/12.2251580.5383482381001.
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