论文标题
通过单光子过程生成极端紫外线激光器
Generation of extreme ultraviolet laser by single-photon process
论文作者
论文摘要
用短波长产生激光是激光技术的瓶颈问题。极端紫外线（EUV）激光通常由非线性多光子过程以低效率产生。在这里，我们通过单次激发相关的刺激反stokes拉曼散射（ASRS）的效率高于高谐波生成（HHG），这显示了相关刺激的反stokes拉曼散射（ASRS）的58.4 nm激光器。利用谐振femto秒的2058 nm激光辐射的亚稳态1S2S状态中的微波激发氦，我们获得了脉冲58.4 nm激光，散发差为1.9 mrad，表明其相干性。比自发发射的寿命短的脉冲衰减时间短426 ps也显示了其刺激的特性。我们的结果表明，通过单光子工艺通往上转换的适用途径，以生成比58.4 nm短波长的激光。
To generate laser with short wavelength is a bottle-neck problem in laser technology. The extreme ultraviolet (EUV) lasers are usually produced with low efficiency by nonlinear multi-photon process. Here we show the generation of 58.4 nm laser by a single-photon-excitation related stimulated anti-Stokes Raman scattering (ASRS) with an efficiency higher than that of high harmonic generation (HHG). Utilizing microwave excited helium in the metastable 1s2s state irradiated by a resonant femto-second 2058 nm laser, we obtain pulsed 58.4 nm laser with a divergence of 1.9 mrad, suggesting its coherent character. The pulse decay time of 426 ps shorter than the lifetime of spontaneous emission also shows its stimulated property. Our results show an applicable path towards up-conversion by single-photon process to generate intense laser with wavelength shorter than 58.4 nm.
