Gigahertz Narrow-Linewidth High-Peak Power Nanosecond Fiber Laser
邹峰 Zou Feng王兆坤 Wang Zhaokun王子薇 Wang Ziwei周翠芸 Zhou Cuiyun刘源 Liu Yuan杨艳 Yang Yan周军 Zhou Jun
Abstract
A GHz narrow-linewidth high-peak power nanosecond fiber laser based on the master oscillator power amplifier(MOPA)is reported.The modulated distributed feedback single-frequency diode laser seed delivers pulses with wavelength of 1064.12nm,pulse width of 3.92ns,and tunable repetition rate from 10kHz to 50kHz.A double-pass structure is used in the preamplifier to boost small signal and suppress amplification of spontaneous emission under intense pump.In the power amplifier the stimulated Brillouin scattering is avoided by shortening fiber length.Pulsed laser with 1.5GHz linewidth and 15kW peak power is obtained at a repetition rate of 10kHz. The output pulse characteristics at different repetition rates are studied.
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