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Simulation and experimental results of a high-gain two-stage and double-pass off-axis Nd:YVO4 picosecond laser amplifier

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Abstract

A high-gain two-stage double-pass off-axis ${\rm{Nd}}{:}{{\rm{YVO}}_4}$ picosecond laser amplifier has been developed. The comprehensive influence of crystal doping concentration and pump beam quality on the small-signal gain of the ${\rm{Nd}}{:}{{\rm{YVO}}_4}$ amplifier is theoretically analyzed with a model developed by considering energy transfer upconversion and pump light absorption saturation effect. The thermal effect of ${\rm{Nd}}{:}{{\rm{YVO}}_4}$ crystal with different doping concentrations, undoped end cap lengths, and pump beam quality is investigated as well. Based on the theoretical analysis, a high-gain two-stage and double-pass off-axis ${\rm{Nd}}{:}{{\rm{YVO}}_4}$ amplifier based on picosecond fiber seed source is realized by choosing long-composite low-doping ${\rm{Nd}}{:}{{\rm{YVO}}_4}$ crystal and with high brightness laser diode pumping, delivering a gain of 28 dB and an output pulse energy of 67.5 µJ at a repetition rate of 200 kHz.

© 2020 Optical Society of America

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