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Ha'erbin gongye daxue xuebao

Experimental study of DFWM based on a novel beam-split technique

Fan Rong-Wei

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

Degenerate four-wave mixing in a forward geometry has been investigated in resonant medium(iodine solution).A novel beam-split technique was used to compensate the beam excursion caused by the laser itself and disturb of the environment,and steady DFWM signals were obtained.Additionally,the conjugation signal intensity was investigated as a function of pump laser energy.

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Degenerate four-wave mixing in a forward geometry has been investigated in resonant medium(iodine solution).A novel beam-split technique was used to compensate the beam excursion caused by the laser itself and disturb of the environment,and steady DFWM signals were obtained.Additionally,the conjugation signal intensity was investigated as a function of pump laser energy.
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.
Degenerate four-wave mixing (DFWM) spectroscopy is a potentially powerful technique for quantitative measurement of minor species in gas-phase media [1-3]. In this paper we compare the DFWM signal levels and lineshapes obtained using two different phase-matching geometries: the phase-conjugate geometry and the forward phase-matched geometry. DFWM signal levels are calculated by solving the time-dependent density matrix equations using direct numerical integration (DNI) [4, 5] for a two-level system interacting with three laser beams. This numerical analysis includes the effects of molecular motion, intermolecular collisions, and high laser intensities, all of which have been shown to affect the DFWM signal level.
The object of this study is to quantitatively elucidate the laser-power dependence in transient degenerate four-wave mixing (DFWM) with an emphasis on the high laser-pump intensity region. We discuss our investigation on the power dependence of transient DFWM by taking gas-phase iodine (I2{\mathrm{I}}_{2}I2​) molecules as a testing example. The distinct physical feature is that in the high-power laser pump, where both laser-pulse duration and the inverse of pump rate are much shorter than the molecular population relaxation time, the steady-state DFWM theory of Abrams and Lind [Optical Phase Conjugation, edited by R. A. Fisher (Academic, New York, 1983), Chap. 8, pp. 211--284; Opt. Lett. 2, 94 (1978); 3, 205 (1978)] is not appropriate. The prediction by the steady-state theory has shown the DFWM to decrease with increasing laser-pump intensity as a function of 1/Ilaser{\mathrm{I}}_{\mathrm{laser}}Ilaser​, which disagrees with the saturation behavior observed in the experiment. To elucidate the dependence of DFWM on the laser pump intensity, a non-steady-state extension of the nonperturbative theory of Abrams and Lind is required. The non-steady-state theoretical result will be shown to be in good agreement with the experimental power dependence at resonance transient DFWM especially in the high-power pump region.
We report an experimental investigation of degenerate four-wave mixing spectrum of SO2.A novel beam-split technique is used to compensate the beam drift caused by the laser itself and disturbance from the environment.Degenerate four-wave mixing spectra of the transition B 1 B1 ← X 1 A11 for SO2 are obtained.The degenerate four-wave mixing signal intensity as a function of the total input laser energy is measured.The effects of the laser field intensity on the degenerate four-wave mixing spectrum are analyzed.Our results show that the degenerate four-wave mixing signal intensity rises with laser intensity and tends to saturate.Then, a dip begins to appear at resonance in the profile with increase in laser field.The existence of saturation for degenerate four-wave mixing signal intensity and spectrum profile confirms the prediction of previous theoretical work.