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The Character Research of UV Coherent Radiation in Ca Vapor

Ang Z

Published Jan 1, 1990• 0 citations
OpenAlex

Abstract

By using twe dye lasers(their output frequencies are ω_1 and ω_2,respectively) pumped by a N_2 laser UV(272.2nm)coherent radiation is generated in unequal frequency two-step or two-photon resonant four-wave mixing process ω_(UV)=ω_1+ω_2 —ω_(IR) in Ca vapor(ω_(IR) is the frequency of IR stimulated radiation).The character of excitation and radiation is researched.

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The Character Research of UV Coherent Radiation in Ca Vapor

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TWO-PHOTON PUMPEL SIX-AND FOUR-WAVE MIXING AND STIMULATED RADIATION IN LITHIUM VAPOR

Zugeng Wang, 华东师范大学物理系,上海,200062

This paper reports the generation of the coherent and stimulated radiation in UV, visible and infrared regions by two-photon pumping. It includes the tunable coherent radiation around 1.03 μm generated by a special six-wave mixing process, the stimulated radiation at 812.6 nm generated by molecular two-photon dissociation or atomic cascade transition, coherent radiation at 323.3 nm and 670.8 nm generated by the four-wave mixings.

Acta Physica Sinica•Jan 1, 1990•0 citations
By using twe dye lasers(their output frequencies are ω_1 and ω_2,respectively) pumped by a N_2 laser UV(272.2nm)coherent radiation is generated in unequal frequency two-step or two-photon resonant four-wave mixing process ω_(UV)=ω_1+ω_2 —ω_(IR) in Ca vapor(ω_(IR) is the frequency of IR stimulated radiation).The character of excitation and radiation is researched.
Coherent radiation at several wavelengths in the vacuum ultraviolet (VUV) has been generated by four-wave parametric oscillation in mercury vapor. When a powerful ultraviolet pump laser of frequency omega(p) is tuned to a two-photon resonance, VUV signal photons at frequency omega(s), as well as idler photons at frequency omega(i), are generated such that omega(s) + omega(i) = 2omega(p). A frequency-doubled dye laser tuned to two-photon resonance with the 6s6d(1)D(2) level near 280.3 nm produced output at 184.9 and 143.5 nm. A tunable krypton fluoride excimer laser tuned to two-photon resonance with the 6s10s (1)S(0) level near 248.7 nm produced output at 140.1, 130.7, 130.1, 125.9, and 125.0 nm. Approximately 1-microJ, 200-W pulses were observed at 143.5 and 125.9 nm.
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.