Deflecting light into resonant cavities for spectroscopy

Details Deflecting light into resonant cavities for spectroscopy Deflecting light into resonant cavities for spectroscopy

1997-10-10

1998-09-29

Rosenberger, Richard A.

Optics: measuring and testing

For light transmission or absorption

Of fluent material

356440, G01N 2117

Patent

active

058152776

ABSTRACT:
Light is coupled into a cavity ring down spectroscopy (CRDS) resonant cavity using an acousto-optic modulator. The AOM allows in-coupling efficiencies in excess of 40%, which is two to three orders of magnitude higher than in conventional systems using a cavity mirror for in-coupling. The AOM shutoff time is shorter than the roundtrip time of the cavity. The higher light intensities lead to a reduction in shot noise, and allow the use of relatively insensitive but fast-responding detectors such as photovoltaic detectors. Other deflection devices such as electro-optic modulators or elements used in conventional Q-switching may be used instead of the AOM. The method is particularly useful in the mid-infrared, far-infrared, and ultraviolet wavelength ranges, for which moderately reflecting input mirrors are not widely available.

REFERENCES:
patent: 3995231 (1976-11-01), Johnson et al.
patent: 5528040 (1996-06-01), Lehmann
Romanini et al., "CW cavity ring down spectroscopy" Chemical Physics Letters 264 (1997) 316, 322, 10 Jan. 1997.

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