钕玻璃宽带激光放大能量提取效率研究

Energy extraction efficiency of broad-band laser in neodymium glass laser amplifiers

基于钕玻璃宽带脉冲激光放大模型,采用数值模拟的方法,研究了钕玻璃放大器对不同输入光 通量、不同脉宽以及不同带宽(或波长分布)脉冲激光放大的能量提取效率。计算结果表明,钕玻璃宽带放大能 量提取效率随着输入光通量的增加而提高,并最终趋于某一定值。对于以均匀加宽为主的介质,随着带宽的增 加,能量提取效率逐渐下降;对于以非均匀加宽为主的介质,随着带宽的增加,能量提取效率先逐渐升高,达到 最大值后开始下降。对于均匀加宽与非均匀加宽线宽比为0.1的混合加宽介质,在饱和通量输入条件下,使用 宽带激光能够带来大约80%的效率提升。

Based on the broad-band pulsed laser amplification model of neodymium glass, the relationship between energy extraction efficiency of the pulsed laser amplification and input fluence, pulse widths and spectral bandwidths (or wavelength distributions) was studied by numerical simulation. The calculation results show that the energy extraction efficiency of the broadband amplification in neodymium glass increases with the increase of the input luminous flux, and finally tends to a certain value. For the medium with uniform broadening, the energy extraction efficiency decreases with the increase of the bandwidth. For the medium with non-uniform broadening, the energy extraction efficiency increases gradually with the increase of the bandwidth, reaching the maximum value, after which it declines. For a mixed widened medium with a uniform widened to non-uniform widened linewidth ratio of 0.1, using a broadband laser can achieve an efficiency improvement of approximately 80% under saturated flux input conditions.