Method and apparatus for providing a phase compensated optical b

Details Method and apparatus for providing a phase compensated optical b Method and apparatus for providing a phase compensated optical b

1975-07-31

1977-02-01

Wilbur, Maynard R.

Optics: measuring and testing

Range or remote distance finding

With photodetection

250199, 330 43, 332 751, 356106R, G01C 308

Patent

active

040059359

ABSTRACT:
According to one herein disclosed embodiment, an initial uncompensated energy pulse is transmitted towards a remotely located target; a portion of the energy reflected from the target is received, processed so as to be back-scattered from a Brillouin mirror, amplified and then retransmitted along a path coincident with the received path. The backscattered energy from the Brillouin mirror is the complex phase conjugate of the received pulse and consequently the second transmitted pulse is phase encoded such that the effects of phase perturbations encountered along the received path are substantially canceled, and near diffraction-limited convergence of the beam upon the target is obtained.

REFERENCES:
patent: 3731103 (1973-05-01), O'Meara
patent: 3733129 (1973-05-01), Bridges
Nosach, JETP Letters, vol. 16, No. 11, pp. 617-621, Dec. 5, 1972.

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