Single focus backward Raman laser

Details Single focus backward Raman laser Single focus backward Raman laser

1992-01-17

1993-12-21

Scott, Jr., Leon

Coherent light generators

Raman laser

372 9, 372 98, 372101, 372 99, 359327, H01S 330

Patent

active

052727173

ABSTRACT:
A single focus backward Raman laser that is a compact, efficient apparatus for converting light at a first wavelength provided by a pump laser to light at a Raman-shifted wavelength. The laser is comprised of a gas cell, two lenses, a feedback mirror, an optical isolator, and a dichroic mirror, and the gas cell contains a Raman gas medium. The Raman gas medium may be methane, hydrogen, or deuterium, for example. The two lenses bring the pump and Raman light to a single focus in the gas cell and also recollimate the light after it exits the cell. The optical isolator is used to prevent the backward-scattered pump light from reentering the pump laser. The dichroic mirror is used to reflect out the backward-scattered Raman light, while transmitting the pump laser light. The present laser has a much improved beam divergence and is much less sensitive to optical misalignments than conventional Raman half-resonator designs. The present laser is also less complex and is more compact than a multiple focus backward Raman laser, with substantially identical Raman conversion efficiency and beam divergence. The present laser is adapted to replace the Raman half-resonator and the multiple focus backward Raman laser in high pulse repetition rate (>1 Hz), medium-energy (.ltoreq.100 mJ, 1.54 .mu.m) eyesafe laser designs.

REFERENCES:
patent: 5058117 (1991-10-01), Shoshan et al.
patent: 5090016 (1992-02-01), Denhirst et al.

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