Deflecting light into resonant cavities for spectroscopy
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.
- Inventors:
-
- Stanford, CA
- Harxheim, DE
- Issue Date:
- Research Org.:
- Stanford Univ., CA (United States)
- OSTI Identifier:
- 871873
- Patent Number(s):
- 5815277
- Assignee:
- Board of Trustees of Leland Stanford Junior Univesity (Stanford, CA)
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01J - MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- DOE Contract Number:
- FG03-92ER14304
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- deflecting; light; resonant; cavities; spectroscopy; coupled; cavity; crds; acousto-optic; modulator; aom; allows; in-coupling; efficiencies; excess; 40; magnitude; conventional; systems; mirror; shutoff; time; shorter; roundtrip; intensities; lead; reduction; shot; noise; allow; relatively; insensitive; fast-responding; detectors; photovoltaic; deflection; devices; electro-optic; modulators; elements; q-switching; method; particularly; useful; mid-infrared; far-infrared; ultraviolet; wavelength; ranges; moderately; reflecting; input; mirrors; widely; available; resonant cavities; light intensities; wavelength range; particularly useful; resonant cavity; ultraviolet wavelength; trip time; acousto-optic modulator; relatively insensitive; wavelength ranges; cavity mirror; electro-optic modulator; /356/
Citation Formats
Zare, Richard N, Martin, Juergen, and Paldus, Barbara A. Deflecting light into resonant cavities for spectroscopy. United States: N. p., 1998.
Web.
Zare, Richard N, Martin, Juergen, & Paldus, Barbara A. Deflecting light into resonant cavities for spectroscopy. United States.
Zare, Richard N, Martin, Juergen, and Paldus, Barbara A. Thu .
"Deflecting light into resonant cavities for spectroscopy". United States. https://www.osti.gov/servlets/purl/871873.
@article{osti_871873,
title = {Deflecting light into resonant cavities for spectroscopy},
author = {Zare, Richard N and Martin, Juergen and Paldus, Barbara A},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {1}
}
Works referenced in this record:
CW cavity ring down spectroscopy
journal, January 1997
- Romanini, D.; Kachanov, A. A.; Sadeghi, N.
- Chemical Physics Letters, Vol. 264, Issue 3-4