1 西安电子科技大学物理与光电工程学院, 陕西 西安 710071
2 中国科学院物理研究所, 北京凝聚态物理国家研究中心, 北京 100190
3 松山湖材料实验室, 广东 东莞 523808
4 中国科学院大学物理科学学院, 北京 100049
超快激光再生放大过程具有复杂的动力学行为, 需要建立模型进行求解和迭代计算。基于改进的 Frantz-Nodvik 方程计算了 Yb:KGW 晶体再生放大器的输出性质, 研究了泵浦强度、晶体长度和泵浦脉宽对放大器输出性能的影响, 同时对不同重复频率再生放大器的输出行为进行了分析。在此基础上设计了再生放大器, 得到了重复频率 1 kHz、单脉冲能量 1 mJ 的激光放大结果, 与理论分析结果符合得较好。该改进的 Frantz-Nodvik 方程对于设计高重复频率、大能量且性能稳定的激光放大器具有参考价值。
激光技术 Frantz-Nodvik 方程 掺镱放大器 再生放大 laser techniques Frantz-Nodvik equation ytterbium-doped amplifier regenerative amplifier
Author Affiliations
Abstract
1 Department of Advanced Green Energy and Environment
,
Handong Global University
,
Pohang 37554
,
Korea
2 Global Institute of Laser Technology
,
Global Green Research and Development Center
,
Handong Global University
,
Pohang 37554
,
Korea
We have optimized the input pulse width and injection time to achieve the highest possible output pulse energy in a double-pass laser amplifier using two Nd:YAG rods. For this purpose, we have extended the Frantz–Nodvik equation by simultaneously including both spontaneous emission and pump energy variation. The effective pump energy of the flash lamp was 8.84 J for each gain medium. The energy of 1 J could be amplified to an output energy of 12.17 J with the maximum achieved extraction efficiency of 63.18% when an input pulse having a pulse width of 168
s is sent 10
s after the absorbed pump energy becomes the maximum value.
High Power Laser Science and Engineering
2018, 6(4): 04000e60
