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Optics Letters

Low-power phase-conjugate interferometry

Israel Bar-Joseph, Amos A. Hardy, Y. Katzir, Yaron R. Silberberg

Published Sep 1, 1981• 33 citations
Publisher

Abstract

The operation of Mach-Zehnder and Michelson phase-conjugate interferometers is demonstrated. Phase conjugation is obtained by degenerate four-wave mixing in thin films of eosin. High-visibility fringes are observed both in cw and pulsed modes of operation.
DOI
10.1364/ol.6.000414

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Studies on low power optical phase conjugation (OPC) in three saturable dyes, viz., eosin, erythrosin B, and rose bengal, embedded in two polymer films, viz., gelatin and polyvinyl alcohol, are presented. Experiments are performed using the 514.5 nm line of an argon-ion laser. Saturation intensities are determined from the transmission versus intensity plots, and triplet lifetimes are estimated from the phosphorescence decay curves. OPC experiments are performed, and the variation of OPC reflectivity with intensity and absorption length is studied. Experimental results are compared with the theory of degenerate four-wave mixing in absorbing media proposed by R. L. Abrams and R. C. Lind [Opt. Lett. 2(4), 94 (1 978)]. There is fair agreement between the theory and the experimental observations. The limitations in using these films for cw OPC applications are briefly discussed.
Optical phase-conjugation (OPC) was observed in Acid blue 9 dye-doped gelatin via degenerate four-wave mixing (DFWM) using a low-power He-Ne laser at 633 nm. Phase-conjugate (PC) signal measurements were made by varying the angle of incidence between the forward-pump beam and the probe beam in the degenerate four-wave mixing geometry. Growth of phase-conjugate signal with respect to the recording time was also measured. Finally double-exposure phase-conjugate interferometry was demonstrated in these dye doped gelatin films.