Spatial filter with gain

Details Spatial filter with gain Spatial filter with gain

1987-08-03

1989-02-07

Davie, James W.

Coherent light generators

Particular active media

Semiconductor

307425, 330 43, 372 21, H01S 319

Patent

active

048036862

ABSTRACT:
Apparatus and a related method for generating a uniphase reference beam from a weak and aberrated input probe beam in an optical system. A portion of the input probe beam is split off and injected into the cavity of a laser, such as a semiconductor diode laser, where four-wave mixing takes place and an amplified input wave or its phase conjugate is output. Because the laser cavity is selected to provide single-mode operation, the laser provides not only amplification but an output that includes a uniphase wave, which may be interfered with the original aberrated input probe beam for purposes of obtaining wavefront information.

REFERENCES:
patent: 4528464 (1985-07-01), Chemla et al.
R. K. Jain, "Degenerate Four-Wave Mixing Near the Band Gap of Semi-Conductors", Appl. Phys. Lett 35(6), Sep. 15, 1979, pp. 454-456.

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