100W全光纤化高重频窄脉宽光纤激光器

100 W All-fiberized Pulsed Fiber Laser with High Repetition Rate and Narrow Pulse Duration

报道了一种基于主振荡功率放大结构工作的全光纤化高重复频率窄脉冲宽度光纤激光器.种子源是一个直接电脉冲调制的1 063 nm光纤耦合输出半导体激光器.为了抑制放大器中产生的放大自发辐射光,将种子激光的脉冲波形调制为二阶超高斯型.峰值功率为950 mW的半导体激光器经过2级大模场掺镱双包层光纤放大器(纤芯分别为10μm和30μm)功率放大后,最终获得了平均功率为101 W、重复频率为200 kHz、脉冲宽度为14.77 ns、峰值功率为34.2 kW、3 dB光谱宽度为0.261 nm、光束质量M^2为1.17的脉冲激光输出.与传统的纳秒级脉冲光纤激光器相比,该激光器峰值功率高、光束质量优、光谱宽度窄、结构简单,可广泛应用于激光雷达、遥感探测、倍频和光参量震荡等领域.

An all-fiberized pulsed fiber laser with high repetition rate and narrow pulse duration based on master oscillator power amplifier structure was reported.The seed source is a directly pulse driven fiber pigtailed laser diode working at 1 063 nm.To restrain the generation of amplified spontaneous emission light in the fiber amplifier,the seed is modulated to work at suitable supper Gaussian shape.The seed laser with peak power of 950 mW is amplified by two stages Yb^（3＋） doped double cladding fibers whose core diameters are 10 μm and 30 μm.At last,the pulsed laser is obtained with an average power of 101 W,a repetition rate of 200 kHz,a pulse duration of 14.77 ns,a peak power of 34.2 kW,a 3 dB spectral spectrum width of 0.261 nm and a beam quality factor M^2 of 1.17.Compared with the conventional nanosecond pulsed laser,the proposed fiber laser is essential or more efficiently in many applications,such as laser radar,remote sensing,frequency doubling and optical parametric oscillator,because of its high peak power,good beam quality,narrow spectrum width and simple structure.