Title

Heterodyne Technique For The Direct Measurement Of The Amplitude And Phase Of Photorefractive Space-Charge Fields

Authors

Authors

D. G. Gray; M. G. Moharam;T. M. Ayres

Comments

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Abbreviated Journal Title

J. Opt. Soc. Am. B-Opt. Phys.

Keywords

CRYSTALS; BATIO3; PHOTOCONDUCTIVITY; GRATINGS; SHIFT; Optics

Abstract

A heterodyne technique is presented for the independent, direct measurement of the amplitude and phase of photorefractive space-charge fields during uninterrupted buildup and photoinduced decay. The technique is based on using a probe beam with a frequency slightly different from that of the two recording beams to continuously read photorefractive phase gratings during all stages of formation and decay. The probe beam is virtually collinear with one of the recording beams. The beat between the diffracted component of the frequency-shifted probe beam and the transmitted component of the recording beam produces a heterodyne beam component. This heterodyne component contains the photorefractive grating information and is monitored to yield the amplitude and phase of the photorefractive fields. This nondestructive characterization technique exhibits excellent sensitivity and permits photorefractive phase measurements to within 1.5-degrees.

Journal Title

Journal of the Optical Society of America B-Optical Physics

Volume

11

Issue/Number

3

Publication Date

1-1-1994

Document Type

Article

Language

English

First Page

470

Last Page

475

WOS Identifier

WOS:A1994NB82200008

ISSN

0740-3224

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