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Journal of the Optical Society of America B

Emission spectrum in a two-photon resonant transition in mercury

E. Koudoumas, Thomas Efthimiopoulos

Published Jun 1, 1993• 3 citations
Publisher

Abstract

The emitted spectrum in the two-photon transition resonant with the 81S0 state in Hg is experimentally investigated. A complete list of the emitted lines that are due to second-harmonic generation, frequency mixing with internally generated photons, parametric generation, Raman scattering, and dimer emission and a list of their relative intensities are presented for the first time to our knowledge.

DOI
10.1364/josab.10.000982

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The emitted spectrum in the two-photon transition resonant with the 81S0 state in Hg is experimentally investigated. A complete list of the emitted lines that are due to second-harmonic generation, frequency mixing with internally generated photons, parametric generation, Raman scattering, and dimer emission and a list of their relative intensities are presented for the first time to our knowledge.
A detailed model of two-photon-resonant four-wave mixing that includes the consideration of efficiency-limiting processes is presented. The model provides a generally applicable systematic approach for maximizing conversion efficiencies for both exact and near two-photon resonance. For exact two-photon resonance, an interference effect limits efficiency to a value determined by ratios of nonlinear susceptibilities and input intensities. For near two-photon resonance, nonlinear refractive indices limit efficiencies unless input intensities are properly balanced. For the specific case of 130.2-nm generation in Hg, we examine a number of potential additional efficiency-limiting processes, including amplified spontaneous emission, stimulated Raman and hyper-Raman gain, parametric gain, linear absorption, and population transfer. We include isotopic effects and Gaussian-profile beams. From our analysis, we conclude that efficiencies of approximately 10% should be feasible by using collimated light beams in an energy-scalable system.
After excitation of the 7 1 S 0 mercury state by two photon absorption of a laser radiation at 313 nm the time integrated intensities of the 407.8 (I 0 ) and 404.7 nm (I 1 ) lines emitted from the 7 1 S 0 and 7 3 S 1 states were determined as functions of the pump laser intensity, I, and mercury pressure. At high pump laser intensities I 0 and I 1 do not follow anymore a quadratic law in I, I 0 weakens to I n<2 while, in contrast, I 1 increases to I n>2 . The time evolutions of the populations of these 7 1 S 0 , 7 3 S 1 states and of the 6 1 P 1 , 6 3 P 0,1,2 states were determined. The set of experimental results is well reproduced by introducing collisions of two Hg(6P) atoms as well as two Hg(7 1 S 0 ) collisions. Effects of these collisions are discussed.