一种基于增益调制技术的全光纤化脉冲Yb光纤激光器

Gain Switched All-fiberized Pulse Yb Fiber Laser

以波长为975nm的半导体激光器作为泵浦源,周期性地脉冲泵浦一个包含Yb掺杂光纤和光纤光栅对的Yb光纤激光器,实现了基于增益调制技术的全光纤化高功率Yb光纤激光器的稳定脉冲输出.在50kHz重频下,采用20W的泵浦功率和2.4μs的泵浦脉冲宽度,获得了1 060nm波长脉冲宽度仅100ns的稳定脉冲激光输出,单脉冲激光能量约为20μJ.以此作为脉冲激光种子进行功率放大,获得了性能稳定的全光纤结构高功率脉冲激光输出,放大后单脉冲能量超过200μJ,激光放大器斜率效率达到60%.

A gain-switched Yb-doped pulse fiber laser which was periodically pumped by a pulsed Laser Diode （LD） centering at wavelength of 975 nm was reported. The pulsed Yb fiber laser was composed of a piece of Yb doped double cladding gain fiber and a pair of fiber Bragg gratings. Under pump power of 20 W and pulse duration of 2.4μs at repetition rate of 50 kHz, stable laser pulse trains were obtained at 1 060 nm with pulse duration of 100 ns. The shot energy of every pulse was measured up to 20 μJ. Using this pulsed Yb fiber laser as the seed, a maser-oscillator power amplifier （MOPA） structured hig exceeding 200 μJ. The slope efficiency of