Wei Kaihua, Chen Tao, Jiang Peipei, Yang Dingzhong, Wu Bo, Shen Yonghang
Opt Express. 2013 Oct 21;21(21):25364-72. doi: 10.1364/OE.21.025364.
We report a novel quasi-synchronously pumped PPMgLN-based high power mid-infrared (MIR) laser with picosecond pulse bunch output. The pump laser is a linearly polarized MOPA structured all fiberized Yb fiber laser with picosecond pulse bunch output. The output from a mode-locked seed fiber laser was directed to pass through a FBG reflector via a circulator to narrow the pulse duration from 800 ps to less than 50 ps and the spectral FWHM from 9 nm to 0.15 nm. The narrowed pulses were further directed to pass through a novel pulse multiplier through which each pulse was made to become a pulse bunch composing of 13 sub-pulses with pulse to pulse time interval of 1.26 ns. The pulses were then amplified via two stage Yb fiber amplifiers to obtain a linearly polarized high average power output up to 85 W, which were then directed to pass through an isolator and to pump a PPMgLN-based optical parametric oscillator via quasi-synchronization pump scheme for ps pulse bunch MIR output. High MIR output with average power up to 4 W was obtained at 3.45 micron showing the feasibility of such pump scheme for ps pulse bunch MIR output.
我们报道了一种新型的基于准同步泵浦的PPMgLN高功率中红外（MIR）激光器，其输出皮秒脉冲串。泵浦激光器是一种具有皮秒脉冲串输出的线性偏振MOPA结构全光纤化镱光纤激光器。锁模种子光纤激光器的输出通过环行器被引导通过一个FBG反射器，以将脉冲持续时间从800 ps缩短至小于50 ps，并将光谱半高宽从9 nm缩小至0.15 nm。变窄后的脉冲进一步被引导通过一个新型脉冲倍增器，通过该倍增器，每个脉冲变成由13个子脉冲组成的脉冲串，脉冲间时间间隔为1.26 ns。然后，这些脉冲通过两级镱光纤放大器进行放大，以获得高达85 W的线性偏振高平均功率输出，接着这些输出被引导通过一个隔离器，并通过准同步泵浦方案泵浦一个基于PPMgLN的光参量振荡器，以实现皮秒脉冲串的中红外输出。在3.45微米处获得了平均功率高达4 W的高功率中红外输出，这表明这种泵浦方案用于皮秒脉冲串中红外输出的可行性。
