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AIP conference proceedings

Linewidth of ultraviolet radiation generated in nonlinear processes

Chao Wu, Sui Xu, T. S. Yih

Published Jan 1, 1986• 0 citations
Publisher

Abstract

Extremely broad linewidths of ultraviolet coherent radiation generated in a four‐wave mixing process in sodium vapor have been observed. When the wavelength of the input visible laser increases it is found that (1) the linewidth of the UV output generated in the 333 nm region correspondingly increases and (2) the integrated intensity of the UV output initially increases and then slowly decreases.

DOI
10.1063/1.35890

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Generation of coherent UV radiation by optical wave-mixing processes in atomic potassium

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Journal of the Optical Society of America B•Mar 1, 1984•38 citations
Extremely broad linewidths of ultraviolet coherent radiation generated in a four‐wave mixing process in sodium vapor have been observed. When the wavelength of the input visible laser increases it is found that (1) the linewidth of the UV output generated in the 333 nm region correspondingly increases and (2) the integrated intensity of the UV output initially increases and then slowly decreases.
An experimental investigation was made of resonant nonlinear four-wave frequency mixing processes involving cw laser radiation in sodium vapor. It was found that, in spite of an increase in absorption, the use of resonant atomic nonlinearities can substantially improve the frequency conversion efficiency in the cw regime. The results of the measurements were compared with the theoretical conclusions. Ultraviolet radiation was generated at the sum frequency ( λ s = 268 nm) with the proportionality factor C = W s / W 1 W 2 W 3 ≈2W −2
A pulsed dye-laser beam (ωL) pumped by a frequency-doubled Nd:YAG laser is focused into a heat-pipe oven containing potassium vapor (nk ≈ 1016 cm−3). Two-photon resonant four-wave and six-wave mixing processes using the potassium 8s 2S1/2 state are investigated. Thirty-two coherent UV radiation lines are generated within the range of 300–400 nm through the processes ωUV = 2ωL ± ωIR and ωUV = 2ωL − ω′IR − ω″IR ± ω‴IR, where ωIR are frequencies of laser-induced IR waves generated in the vapor near the transitions 8S–7P, 7P–7S, 7P–5D, 8S–6P, 7S–6P, 5D–6P, etc. The influence of resonant enhancement on the UV line intensities and the phase-matching condition are analyzed.