Parasitic Stimulated Amplification in High-Peak-Power and Diode-Seeded Nanosecond Fiber Amplifiers
Parasitic Stimulated Amplification in High-Peak-Power and Diode-Seeded Nanosecond Fiber Amplifiers
复制标题
DOI：
10.1109/jphot.2014.2319090
复制
发表时间：
2014-06-01
影响因子：
2.4
通讯作者：
Huang, S. L.
中科院分区：
文献类型：
--
作者：
Chang, C. L.;Lai, P. Y.;Huang, S. L.
对掺镱光纤激光放大系统中的宽带寄生放大进行了数值模拟和实验研究。放大源自与1064 nm种子二极管激光器相关联的弱脉冲寄生信号。虽然寄生脉冲的平均功率小于总种子激光功率的5%，但在放大期间观察到显著的瞬态尖峰。与模拟结果一致，瞬态尖峰引起的非线性效应限制了光纤前置放大器中信号峰值功率的缩放。利用窄带滤波器消除寄生脉冲，多级二极管种子光纤放大器激光器系统的功率和能量可扩展性得到了显著改善。在多级掺Yb 3+光纤放大器中成功地产生了峰值功率为120 kW、能量为1.2 mJ的1064 nm激光脉冲，其能量增益为63 dB，转换效率为56%。在观看的寄生脉冲的8.8 nm的带宽，它有可能成为一种新的种子源的高峰值功率光纤放大器。
The broadband parasitic amplification in a diode-seeded nanosecond ytterbium-doped fiber laser amplifier system is numerically and experimentally investigated. The amplification is originated from a weak and pulsed parasitic signal associated with the 1064-nm seed diode laser. Although the average power of the parasitic pulse is less than 5% of the total seed laser power, a significant transient spike is observed during the amplification. In agreement with the simulation, nonlinear effects caused by the transient spike limits the scaling of signal peak power in fiber preamplifiers. With the utilization of a narrow bandwidth filter to eliminate the parasitic pulse, the power and energy scalability of a multistage diode-seeded fiber amplifier laser system has been significantly improved. At 1064 nm, pulses with the peak power of 120 kW and energy of 1.2 mJ have been successfully generated in the multistage Yb3+-doped fiber amplifier with an energy gain of 63 dB and 56% conversion efficiency. In viewing of the parasitic pulse's 8.8-nm bandwidth, it has the potential to become a novel seed source for high-peak-power fiber amplifiers.