Optical phase conjugation apparatus including light pipe for mul

Details Optical phase conjugation apparatus including light pipe for mul Optical phase conjugation apparatus including light pipe for mul

1990-04-20

1991-10-22

Moskowitz, Nelson

Amplifiers

Parametric amplifiers

Semiconductor type

385123, H01S 3098, H01S 398

Patent

active

050599178

ABSTRACT:
A rectangular light pipe (38) and associated optical elements (36), (40) are used to produce an overlapped combination of an array of aberrated laser beams (32), (34) inside a phase conjugate mirror (42). The beam array (32), (34) is focussed onto the entrance face (38a) of the light pipe (38) in such a way that each beam (32), (34) spreads by diffraction and internal reflections to fill the exit face (38b) of the light pipe (38). An image of the exit face (38b), which is completely filled by the overlapped beams (32), (34), is focussed into the phase conjugate mirror (42) such as to produce an overlap spot (46) size which is independent of beam aberation level. The apparatus preserves the linear polarization of the input beams (32), (34), has low optical loss, and may be incorporated into a 2 pass (50), (74) or 4 pass (80) phase conjugate master-oscillator power amplifier.

REFERENCES:
patent: 1981999 (1934-11-01), French
patent: 4794605 (1988-12-01), Aprahamian et al.
patent: 4907851 (1990-03-01), Mahric
patent: 4927251 (1990-05-01), Schaen
patent: 4943782 (1990-07-01), Stephens et al.
patent: 4944591 (1990-07-01), McMichael
Appl. Phys. Lett 50(1), Mar. 16, 1987, "Phase Conjugate Master Oscillator-Power Amplifier Using BaTiO.sub.3 and AlGaAs Semiconductor Diode Lasers", R. R. Stephens et al., pp. 647-649.
Tonita et al.; "Polarization and Spatial . . . Applications;" IEEE JQB, vol. 25, #3, pp. 315-338, 3/89; abstract supplied.
O'Meara, T. B.; "Correction of Phase . . . Techniques", NTIS AO-AO 66/48/81 3/79, 135pp; abst. only supplied.

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