利用摻釹釔鋁石榴石雷射在氫氣的反斯托克斯位移來產生深紫外/真空紫外光

Abstract

在光分解動力學研究中利用深紫外/真空紫外光（DUV / VUV）來游離光激發反應物和光分解碎片是有效的通用探測方法。因為它避免了探測激發態反應物時所受限制的Frank-Condon探測區域以及使用UV多光子游離過程中光分解碎片的進一步破裂。然而，低光子通量和窄波長可調性仍然是雷射VUV光源應用於稀薄且多樣光分解產物游離方法的主要挑戰。

在這裡，我們建立了一個真空抽氣光學系統，利用Nd：YAG雷射在氫氣中的反斯托克斯拉曼位移產生DUV / VUV光。在設計的光學系統中我們已經能實現高光子通量和寬波長可調性。此外，我們設計光學延遲激發探測光路，用以應用該系統到皮秒時間解析激發探測實驗。

Using deep ultraviolet/vacuum ultraviolet light (DUV/VUV) as a universal probing method to ionize the photoexcited reactants and photofragments is beneficial in the photodissociation dynamics studies. Since it avoids the restricted probing Frank-Condon region of excited reactants and the cracking of photofragments in the utilizing of UV multi-photoionization. However, the low photon flux and narrow wavelength tunability of VUV light are still challenging for laser based VUV light source to be applied in the ionization of dilute and various photoproducts.

Here, we set-up a vacuum pumped optical system for the generation of DUV/VUV lights by anti-Stokes Raman shifting of Nd:YAG laser in hydrogen gas. Both the high photon flux and broad wavelength tunability are achieved in the designed optical system. Furthermore, we compose the optical delayed pump-probe light path for applying this system to the picosecond time-resolved pump-probe experiment.