双脉冲序列激光放大实验研究

掺Yb~(3+)类高饱和通量增益介质的储能提取,会给激光器带来严重的安全风险,因此提出一种激光脉冲的时分复用放大技术。利用激光的偏振特性以及自由空间传输延迟,获得脉冲参数可变的脉冲序列,并进行验证实验。结果表明,时分复用放大与单脉冲放大的增益没有明显差别,且在约1.4 J/cm~2的工作通量下,子脉冲时间间隔(14~22 ns)对激光增益的影响可以忽略不计。时分复用放大在保持总激光通量不变的前提下,降低了子脉冲的激光通量,降低了光学元件的损伤风险,保证了储能的有效提取。

Experimental study on amplification of dual-pulse-serial laser

In order to effectively solve the security risk from energy extraction of high saturation fluency materials such as Yb-doped materials, a noval time-multiplexing amplification technology is given. By lasers polarization characteristics and the free space propagation delay, laser pulse serials with various pulse parameters is obtained and the experiment is carried out. Comparing time-multiplexing amplification with single-pulse amplification, it indicates that the gain has no significant difference. For our laser fluency, subpulse interval from 14 ns to 22 ns has little influence on laser gain. It fully illustrates that when keeping certain total laser fluency, time-multiplexing amplification can reduce the subpulses fluency and the risk of optical element. So the storage energy can be effectively extracted.