Broad band crossed-beam raman amplifier

Coherent light generators – Raman laser

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372102, 307426, H01S 330

Patent

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049224956

ABSTRACT:
This invention relates to increasing the power output of a broadband Raman amplifier by angle-tuned phase matching of either multiple individual pump lines or a continuous spectra in a pump beam 1 relative to their corresponding Stokes lines or Stokes spectra in the Stokes seed beam 2 so that energy can transfer from the pump lines to the Stokes lines more efficiently. The invention can work in any solid or fluid Raman medium. The Raman cell could be in a length of optical fiber using the internal reflections in the optical fibers as mirrors 8. By using angle tuning, enhancement of the Raman gain is produced which allows the Raman amplifier to achieve high power output with much larger pump bandwidths than were previously possible. The input pump beam 1 is fanned by diffraction grating 3 so that the pump lines are at the proper angle to be phase matched with the Stokes seed beam 2 which may also be fanned. The invention works with a crossed-beam near-collinear amplifier or a crossed-beam wide angle, zigzag amplifier. The fanned Stokes output beam 12 can be made into an unfanned Stokes beam 14 by use of a diffraction grating 13.

REFERENCES:
patent: 3515897 (1970-06-01), Culver
patent: 4742522 (1988-05-01), Linford
Bradley L. Bobbs and Jeffrey A. Goldstone "The Zigzag Broadband Ramna Amplifier" presented 1/18/89 Proc. SPIE v. 1060 (1989).
J. A. Goldstone, Bradley Bobbs and Michael M. Johnson Angular Compensation for Multiline Dispersion in Raman Amplifiers Proc. SPIE 874,107 (1988) presented Jan. 10, 1988.
Air Force patent application, Ser. No. 07/286,029, Filing date: 12/14/88, Inventors: Bobbs and Goldstone.

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