概括
研究人员开发了一种全新的全固态单频248nm深紫外线 (DUV) 激光源. 这种先进的DUV激光器实现了瓦特级功率,大大提高了深紫外线生成的先前结果.
科学领域:
- 激光物理和光子学 激光物理和光子学
- 非线性光学是非线性光学.
- 深紫外线 (DUV) 技术
背景情况:
- 全固态深紫外线 (DUV) 激光源对于各种科学和工业应用至关重要.
- 以前的248 nm的DUV源的平均功率受到限制,这阻碍了它们的实际用途.
- 总频生成 (SFG) 是一种关键的非线性光学过程,用于生成更短的波长.
研究的目的:
- 实现一个全固态单频248nm深紫外线 (DUV) 源,显著提高平均功率.
- 为了提高DUV输出的总频率生成过程的转换效率.
- 研究提高脉冲能量和优化非线性晶体参数的方法.
主要方法:
- 采用脉冲送来提高1064nm基本激光驱动器的脉冲能量.
- 利用模拟引导的优化来确定827nm光学参数振荡器 (OPO) 的三酸盐 (LBO) 晶体的最佳长度.
- 在355nm和827nm激光器之间实施总频生成 (SFG),以产生248nm输出.
主要成果:
- 实现了全固态单频248nm DUV源的瓦特级 (~1.2W) 平均功率.
- 在4kHz的重复率下,从1.41%提高到3.93%的整体转换效率,从1064nm提高到248nm.
- 测量的光束质量系数M2为1.61 (x方向) 和1.10 (y方向),线宽约为270MHz.
结论:
- 这项工作报告了全固态单频248nm DUV源的第一个瓦特级输出.
- 脉冲和优化的OPO晶体长度的组合显著提高了DUV生成效率.
- 取得的性能标志着高功率,窄线宽DUV激光技术的实质性进步.
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