Direct measurement of the amplitude and the phase of photorefractive fields in KNbO_3:Ta and BaTiO_3

Lawler, William B.; Sherman, Christopher J.; Moharam, M. G.

doi:10.1364/josab.8.002190

Cited by 10 publications

(1 citation statement)

References 18 publications

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“…In these techniques a phase shift between the writing beams is introduced by use of a ramped electro-optic modulator, 3 a piezoelectric ac phase modulator, [4][5][6][7][8][9] or an electro-optic ac phase modulator. 10,11 Other techniques use Bragg cells to introduce small frequency shifts (heterodyne detection) [12][13][14][15] or make use of the differences of (phase-sensitive) two-beam coupling and simple (phase-insensitive) diffraction. 16,17 Monitoring the two-beam coupling signal when rapidly translating the grating (or the sample) can also be a method to measure the photorefractive phase shift.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the photorefractive grating phase shift in a polymer by an ac phase-modulation technique

Liphardt

Ducharme

1998

J. Opt. Soc. Am. B

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The complex coupling constant of a photorefractive polymer was measured as a function of an applied electric field by use of a modified ac phase modulation technique. We determined that both a photorefractive index grating and a nonphotorefractive absorption grating were present. The electric field dependencies of the amplitude and the phase of the photorefractive gain coefficient were accurately described by standard photorefractive theory. The accuracy of the photorefractive phase shift as measured by this phase-modulation technique was Ϯ1°near phase shifts of 90°and Ϯ3°near phase shifts of 45°.

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