Nonlinear delay line encoding/decoding arrangements

Details Nonlinear delay line encoding/decoding arrangements Nonlinear delay line encoding/decoding arrangements

1986-02-26

1987-02-10

Moskowitz, Nelson

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

307425, 455611, H01S 330

Patent

active

046425829

ABSTRACT:
Apparatus for encoding and decoding laser pulses, or the like. At least one laser source applied laser energy to a nonlinear material in a manner such that counter-propagating beams are applied to the material. These laser beams are spatially or temporally modulated in a predetermined manner. The modulation may be continuous, or discrete, amplitude or phase modulation. Another laser source provides a probe pulse which traverses the nonlinear material and interacts with the counter-propagating laser beams in a manner known as four-wave mixing. This process generates an encoded laser pulse whose modulation pattern is a function of the modulation of the counter-propagating beams. A decoded laser pulse is obtained by applying the encoded pulse to the apparatus and reversing the modulation of the counter-propagating laser beams.

REFERENCES:
patent: 4145671 (1979-03-01), Hellworth
patent: 4209690 (1980-06-01), Rentrepis
patent: 4220928 (1980-09-01), Bloom et al.
patent: 4321550 (1982-03-01), Eutuhev
O'Meara et al., "Time-Domain Signal . . . Delay Lines", 4/82, pp. 237-242, Opt. Eng. vol. 21(2).
Fekita et al., "Phase-conjugate . . . in the Isotropic Phase", 2/80, pp. 51-53, Opt. Letters, vol. 5, #2.

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