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Photorefractive Effects, Materials, and Devices

Double-peak Phase Conjugate Reflectivity in InP:Fe at 1.32 µm

Dirk Jürgens, Azad Z. Siahmakoun, William A. Wood

Published Jan 1, 1999• 0 citations
Publisher

Abstract

We report on double-peak reflectivity temperature-tuned optical phase conjugation (OPC) in InP:Fe under dc fields. Degenerate four-wave mixing (DFWM) is realized in a new single-pump geometry that generates reflectivities up to 6.7% for pump intensity of 28 mW/cm2. The phase conjugate reflectivity exhibits strong temperature dependence but optimum reflectivity temperature deviates from that of the two-wave mixing (TWM) resonance. The thermal scans also exhibit different characteristics with the readout pump at a small phase-mismatch with respect to the writing beams.

DOI
10.1364/apmed.1999.wmpc6

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American Journal of Applied Sciences•Aug 1, 2005•6 citations
We report on double-peak reflectivity temperature-tuned optical phase conjugation (OPC) in InP:Fe under dc fields. Degenerate four-wave mixing (DFWM) is realized in a new single-pump geometry that generates reflectivities up to 6.7% for pump intensity of 28 mW/cm2. The phase conjugate reflectivity exhibits strong temperature dependence but optimum reflectivity temperature deviates from that of the two-wave mixing (TWM) resonance. The thermal scans also exhibit different characteristics with the readout pump at a small phase-mismatch with respect to the writing beams.
Degenerate-four-wave mixing (DFWM) is an important technique for the generation of phase-conjugate wave, to which much attention has been paid. In this paper. a tunalile CW CO2 1.aser is used as the pump sourse and gaseous SF6 as the nonlinear medium, the dependence of reflectivity of phase-conjugate wave generated by DFWM on the pump intensity, the pressure in SF6, the angle between the pump and probe beams as welt as the potarization of the optical fields etc, is investigated experimentatty and exptained theoretically. Peak reftectivity of 2.1x101 is abtained at P=4 Torr in the gaseous SF6. In the Doppler-free phase-conjugate spectrum of SF6 five absorption dips are observed and the spectral resolving power is measured to be about 3 MHz.
The work reported here demonstrates for the first time degenerate four wave mixing (DFWM) phase conjugation in cesium (Cs) atomic vapor. The strong, spectrally narrow transition of cesium at 852 nm gives conjugate reflectivities up to 154% with low pump beam powers. Temperature tuning of the DFWM response over a 30 GHz bandwidth is also demonstrated. An improved experimental design to determine the DFWM angular response shows a field-of-view of 20 mrad at the half response points. Self-focusing effects are observed to be similar to those in sodium vapor with an onset of increased conjugate divergence for reflectivities greater than about 25%.
Optical Phase-Conjugation (OPC) has been observed in Methyl Green (MG) dye sensitized gelatin films in Degenerate Four-Wave Mixing (DFWM) configuration at 633 nm radiation from a He-Ne laser of total power 35 mW.The mechanism of Phase-Conjugate (PC) wave generation associated with this dye-doped system was discussed.The dependence of the PC wave generation on the incident angle between the forward-pump and the probe beams and time of evolution were also studied.A maximum phase-conjugate beam reflectivity of about 0.13% has been observed in this dye-doped gelatin films.