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Spectroscopy Letters

Detection of Trace Iodine in Solution by Phase Conjugate Reflection

Kitao Fujiwara, Kenji Kurokawa, Hisao Uchiki, Takayoshi Kobayashi

Published Jan 1, 1987• 3 citations
Publisher

Abstract

The phase conjugation of degenerate four-wave mixing (DFWM) was observed by irradiating an excimer laser pumped dye laser to iodine/benzene solution. It is confirmed that the generated light intensity shows guadratic proportion to the absorbance of solution.
DOI
10.1080/00387018708082285

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In this paper, frequency-doubled Nd:YAG laser's phase conjugation has been investigated experimentally using resonant degenerate four-wave mixing (DFWM). The iodine solution was used as resonant medium. In this way, the energy of the DFWM phase conjugation beam arrived at 43μJ/pulse while the total pump beam's energy reached 8mJ/pulse. The relation between the pulse energy of the DFWM phase conjugation beam and that of the pump beam was investigated. We also measured the optical field distributions of pump beam and DFWM phase conjugation beam, from which it can be noticed that the DFWM phase conjugation can improve the laser beam quality. At the same time, we observed the influence of the pump beam's disturbance on the DFWM signal.
We have investigated degenerate four-wave mixing (DFWM) in a strongly absorbing molecular gas. A theory taking into account saturable absorption of the interacting beams is used to explain the dependence of the DFWM reflectivity on laser intensity and on the molecular number density. These parameters have a great influence on the observed spectra, owing to linear absorption that suppresses the DFWM signal in the line center of the molecular transitions. The great sensitivity of the spectra to the experimental conditions limits the applicability of DFWM for spectroscopic studies in absorbing media.