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. 5 figs.
- Inventors:
- Issue Date:
- Research Org.:
- Stanford Univ., CA (United States)
- Sponsoring Org.:
- USDOE, Washington, DC (United States)
- OSTI Identifier:
- 672693
- Patent Number(s):
- 5815277
- Application Number:
- PAN: 8-949,242
- Assignee:
- Leland Stanford Junior Univ., Stanford, CA (United States)
- DOE Contract Number:
- FG03-92ER14304
- Resource Type:
- Patent
- Resource Relation:
- Other Information: PBD: 29 Sep 1998
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 40 CHEMISTRY; SPECTROSCOPY; CAVITY RESONATORS; PHOTODETECTORS; INFRARED RADIATION; ULTRAVIOLET RADIATION; SPECTROMETERS; BEAM OPTICS
Citation Formats
Zare, R N, Martin, J, and Paldus, B A. Deflecting light into resonant cavities for spectroscopy. United States: N. p., 1998.
Web.
Zare, R N, Martin, J, & Paldus, B A. Deflecting light into resonant cavities for spectroscopy. United States.
Zare, R N, Martin, J, and Paldus, B A. Tue .
"Deflecting light into resonant cavities for spectroscopy". United States.
@article{osti_672693,
title = {Deflecting light into resonant cavities for spectroscopy},
author = {Zare, R N and Martin, J and Paldus, B 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. 5 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {9}
}