Laser having a nonlinear phase conjugating reflector

Details Laser having a nonlinear phase conjugating reflector Laser having a nonlinear phase conjugating reflector

1978-09-27

1980-11-11

Sikes, William L.

Oscillators

Molecular or particle resonant type

331 945T, H01S 310

Patent

active

042335710

ABSTRACT:
A laser which self-corrects for distortions introduced into the laser beam wavefronts by aberrations and time-varying phenomena internal to the laser. The improved laser includes a partially transmissive first reflecting element, an aperture stop, a lasing medium and a nonlinear phase conjugate reflecting device as the second reflecting element. During laser operation, aberrated wavefronts impinging upon the second reflecting element are reflected as the phase conjugate waveform thereof. The aperture stop restricts laser operation to the fundamental mode which allows only corrected, unaberrated waves to pass through the aperture stop and to subsequently exit the laser. Four embodiments are described utilizing stimulated Brillouin scattering (SBS), four-wave mixing, three-wave mixing and photon echo devices as the second reflecting element.

REFERENCES:
patent: 3617927 (1971-11-01), Pohl
patent: 3731103 (1973-05-01), O'Meara
patent: 3999144 (1976-12-01), Bret
patent: 4005935 (1977-02-01), Wang
Freeman et al., Adaptive Laser Resonator, Opt. Lett., vol. 2, No. 3, (Mar. 1978), pp. 61-63.
Zeldovich et al., Connection Between Wave Fronts of the Reflected and Excited Light in Stimulated Mandel'shatm-Brillouin Scattering, Zhetf Pis. Red. 15, No. 3, (Feb. 5, 1972), pp. 160-164.
Nosach et al., Cancellation of Phase Distortion in the Amplifying Medium with a Brillouin Mirror, Zhetf Pis. Red. 16, No. 11, (Dec. 5, 1972), pp. 617-621.

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