Larsen C, Giesberts M, Nyga S, Fitzau O, Jungbluth B, Hoffmann H D, Bang O
DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, 2800 Kgs Lyngby, Denmark.
Opt Express. 2013 May 20;21(10):12302-8. doi: 10.1364/OE.21.012302.
Gain-switching of a CW fiber laser is a simple and cost-effective approach to generate pulses using an all-fiber system. We report on the construction of a narrow bandwidth (below 0.1 nm) gain-switched fiber laser and optimize the pulse energy and pulse duration under this constraint. The extracted pulse energy is 20 μJ in a duration of 135 ns at 7 kHz. The bandwidth increases for a higher pump pulse energy and repetition rate, and this sets the limit of the output pulse energy. A single power amplifier is added to raise the peak power to the kW-level and the pulse energy to 230 μJ while keeping the bandwidth below 0.1 nm. This allows frequency doubling in a periodically poled lithium tantalate crystal with a reasonable conversion efficiency.
连续波光纤激光器的增益开关技术是一种使用全光纤系统产生脉冲的简单且经济高效的方法。我们报道了一种窄带宽（低于0.1纳米）增益开关光纤激光器的构建，并在此约束条件下优化了脉冲能量和脉冲持续时间。在7千赫兹时，提取的脉冲能量为20微焦，持续时间为135纳秒。对于更高的泵浦脉冲能量和重复频率，带宽会增加，这设定了输出脉冲能量的极限。添加了一个功率放大器，将峰值功率提高到千瓦级别，脉冲能量提高到230微焦，同时保持带宽低于0.1纳米。这使得在周期性极化钽酸锂晶体中能够实现具有合理转换效率的倍频。
