Laser beam clean-up using mutually pumped phase conjugation

Details Laser beam clean-up using mutually pumped phase conjugation Laser beam clean-up using mutually pumped phase conjugation

1990-03-02

1991-02-05

Gonzalez, Frank

Coherent light generators

Particular beam control device

Nonlinear device

372 33, 350354, H01S 310

Patent

active

049911775

ABSTRACT:
A mutually pumped phase conjugator (MPPC) is used to remove spatial distortions from a high power laser beam. The high power beam with its "dirty" spatial profile is directed into one side of the MPPC. A spatially clean beam at the same nominal frequency as the high power beam is output from a continuous wave (CW) laser and directed into the opposite side of the MPPC. As a result of mutually pumped phase conjugation, the MPPC returns a phase conjugate beam that retains the clean spatial profile of the CW beam but acquires the temporal characteristics of the high power beam. A Faraday isolation system may be used to separate the phase conjugate beam from the incident CW beam to provide an output beam having a clean spatial profile. If desired, the high power beam can be transformed into an image bearing output beam simply by modifying the incident CW beam with a transparency or spatial light modulator. If the average intensity of the dirty beam is much higher than that of the CW beam, only a small fraction of the dirty beam needs to be directed into the MPPC for beam clean-up. The larger fraction of the dirty beam can be directed into a photorefractive crystal for two-beam coupling with the clean beam output by the MPPC. By means of photorefractive two-beam coupling, energy from the dirty high power beam serves to amplify the clean beam, thereby improving the overall energy efficiency of the laser beam clean-up system.

REFERENCES:
patent: 4794605 (1988-12-01), Aprahamian et al.
patent: 4902980 (1990-02-01), O'Meara
patent: 4911537 (1990-03-01), Ewbank
patent: 4921335 (1990-05-01), Ditman, Jr.
A. Chiou and P. Yeh, "Laser-beam cleanup using photorefractive two-wave mixing and optical phase conjugation," Optics Letters, vol. 11, No. 7, pp. 461-463, Jul. 1986.
J. Feinberg, "Photorefractive Nonlinear Optics," Physics Today, pp. 46-52, Oct. 1988.

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