Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1978-01-06
1979-03-20
Moskowitz, Nelson
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
307 883, H01S 330
Patent
active
041456718
ABSTRACT:
An apparatus and method for creating a time-reversed replication of an optical wave front. More specifically, an apparatus and method is disclosed in which a non-linear medium having counter-propagating monochromatic optical waves passing therethrough generates a time-reversed replica of an incident wave, the generation being due to non-linear refraction within the medium. As a monochromatic light-ray beam source irradiates an inhomogeneous, nonabsorbing medium, (e.g., a frosted pane of glass), the wave front of the source beam is broken up during transmission therethrough so that any image information contained within the source beam is unrecognizable from the other side of the frosted glass. According to the present invention, this unrecognizable image, when directed into the non-linear medium containing the counter-propagating optical waves is reflected back as a time-reversed wave due to the non-linear refraction of the medium. When this reflected wave irradiates the same inhomogeneous medium, the source beam is recreated on the source beam side of the frosted glass. A beam splitter then isolates the reconstructed reflected wave from the source wave.
REFERENCES:
patent: 3875422 (1975-04-01), Stolen
patent: 4005935 (1977-02-01), Wang
Hellworth, "Generator of Time Reversed Wave Fronts by Nonlinear Refraction", 1/77, pp. 1-3, J. Opt. Soc. Am., vol. 67, #1, G-250.
Yario, "On Transmission and Recovery of 3-D Image . . . ", 4/76, pp. 301-305, J. Opt. Soc. Am. vol. 66, #4, G-250.
Zel'Dovich et al. "Observation of Wave Front Inversion . . . ", 1/5/77, Pis'ma Zh. Eksp. Teor. Fig. 25, #1, pp. 41-44.
Nosach et al., "Cancellation of Phase Distortions . . .", 12/5/72, pp. 617-621, Zhetf Pis. Red., 16, #11.
Moskowitz Nelson
University of Southern California
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