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Title: 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}
}