Vacuum ultraviolet 178.7 nm emission in sodium vapour under two-photon resonance excitation

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/39206

Title:	Vacuum ultraviolet 178.7 nm emission in sodium vapour under two-photon resonance excitation
Authors:	Yih,TS;Pong,BJ;Cheng,WT;Chu,CC
Contributors:	物理研究所
Keywords:	HYPER-RAMAN EMISSION;HARMONIC-GENERATION;RARE-GASES;4-WAVE;SUPPRESSION;RADIATION
Date:	1996
Issue Date:	2010-07-08 14:08:16 (UTC+8)
Publisher:	中央大學
Abstract:	We have observed a fixed wavelength emission at 178.7 nm in sodium vapour under 578.7 nm two-photon resonance excitation. The proposed non-linear wave mixing scheme is described by omega(178.7 nm) = 2 omega(L) + omega(465.7 nm); where omega(178.7 nm) is the 178.7 nm photon frequency, omega(L) is the laser-photon frequency, and omega(465.7 nm) is the 465.7 nm photon frequency. This 465.7 nm emission comes from another six-wave mixing process involving two hyper-electronic Raman scattering photons. The excitation spectrum of the 178.7 nm emission has a typical multiwave mixing pattern with a competing effect appearing at higher temperatures under two-photon resonance excitation. Numerical analysis indicates that this vacuum ultraviolet emission has a poor phase-match condition that will depress the emission intensity to a certain extent. This makes the observation more difficult compared with other reported four-wave mixing generated emissions. Fortunately, on the one hand, it is enhanced by quasi-auto-ionization resonance when the 3s-5s transition is coupled to the sodium continuum by a 330.2 nm photon. On the other hand, its wavelength sits so close to the sodium Cooper minimum that weak absorption will not suppress this vacuum ultraviolet emission further.
Relation:	OPTICAL AND QUANTUM ELECTRONICS
Appears in Collections:	[Graduate Institute of Physics] journal & Dissertation

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