Stimulated Raman scattering enhancer

Details Stimulated Raman scattering enhancer Stimulated Raman scattering enhancer

1988-01-14

1989-08-15

Sikes, William L.

Coherent light generators

Raman laser

372 18, 372 53, 372 73, H01S 3094

Patent

active

048582387

ABSTRACT:
Normal stimulated Raman scattering (SRS) is done in a gas cell with pump and Stokes seed input beams. The pump photons excite gas molecules in the gas cell from their ground state and the Stokes seed photons stimulate the de-excitation of the molecules back to a lower state (emitting more Stokes photons in the process). The SRS enhancer entails inputting another beam at a frequency, different from the pump and seed, tuned between a third molecular state and the Raman virtual state created by the pump/seed off-resonant two-photon transition. The third laser enhances the Raman virtual state, thereby also enhancing the two-photon transition rate. Since the two-photon transition is the SRS process, the Stokes amplification is enhanced.

REFERENCES:
patent: 3417346 (1968-12-01), Yatsiv
patent: 4048516 (1977-09-01), Ammann
patent: 4264877 (1981-04-01), Grischkowsky et al.
patent: 4315224 (1982-02-01), Ezekiel et al.
patent: 4318057 (1982-03-01), Buchwald et al.
patent: 4399539 (1983-08-01), White
patent: 4486884 (1984-12-01), White
Cardimona, D. A., "Enhancement of off-resonant stimulated Raman scattering," J. Phys. B: At. Mol. Phys. 20 (1987), 199-209, printed in the UK.

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