利用氢气和氪气中的双光子共振实现极紫外光的宽可调谐差频产生

Broadly tunable difference-frequency generation of VUV using two-photon resonances in H(2) and Kr.

作者信息

Strauss C E, Funk D J

出版信息

Opt Lett. 1991 Aug 1;16(15):1192-4. doi: 10.1364/ol.16.001192.

DOI:10.1364/ol.16.001192

PMID:19776917

Abstract

We report generation of tunable VUV radiation in the range 117-150 nm by four-wave difference-frequency mixing of a tunable ArF excimer laser with an Nd:YAG-pumped dye laser. The four-wave mixing occurs through two-photon resonant enhancement of X((3)) through the E,F(1)Sigma(g)+ (E,' = 2, J' = 0-3) state(s) of H(2) or the 4p(5)6p(3/2)(2) state of Kr in the process (2omega(193) - omega(dye) = omega(VUV)). An estimate of energy efficiency yields 3 x 10(-5) near 133 nm for both H(2) and Kr. Even though several rotational resonances fall within the natural 193-nm bandwidth, mixing with broadband ArF output in H(2) yields single-line VUV output with a FWHM of 3.5 cm(-1) at half the efficiency compared with that of line-narrowed operation.

摘要

我们报道了通过可调谐ArF准分子激光器与Nd:YAG泵浦染料激光器的四波差频混合，产生了波长范围在117 - 150 nm的可调谐真空紫外（VUV）辐射。四波混频通过H₂的E、F(1)Σg⁺（E' = 2，J' = 0 - 3）态或Kr的4p⁵6p(3/2)²态对X((3))的双光子共振增强而发生，过程为（2ω₁₉₃ - ω染料 = ωVUV）。能量效率估计在133 nm附近时，H₂和Kr的效率均为3×10⁻⁵。尽管有几个转动共振落在193 nm的自然带宽内，但在H₂中与宽带ArF输出混合时，产生的单线VUV输出的半高宽为3.5 cm⁻¹，效率仅为线窄操作时的一半。