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Title: Optical heterodyne detection for cavity ring-down spectroscopy

Abstract

A cavity ring-down system for performing cavity ring-down spectroscopy (CRDS) using optical heterodyne detection of a ring-down wave E.sub.RD during a ring-down phase or a ring-up wave E.sub.RU during a ring up phase. The system sends a local oscillator wave E.sub.LO and a signal wave E.sub.SIGNAL to the cavity, preferably a ring resonator, and derives an interference signal from the combined local oscillator wave E.sub.LO and the ring-down wave E.sub.RD (or ring-up wave E.sub.RU). The local oscillator wave E.sub.LO has a first polarization and the ring-down wave E.sub.RD has a second polarization different from the first polarization. The system has a combining arrangement for combining or overlapping local oscillator wave E.sub.LO and the ring-down wave E.sub.RD at a photodetector, which receives the interference signal and generates a heterodyne current I.sub.H therefrom. Frequency and phase differences between the waves are adjustable.

Inventors:
 [1];  [2];  [3]
  1. (Saratoga, CA)
  2. (Mountain View, CA)
  3. (Stanford, CA)
Issue Date:
Research Org.:
Stanford Univ., CA (United States)
OSTI Identifier:
873117
Patent Number(s):
6094267
Application Number:
09/295,213
Assignee:
Board of Trustees of Leland Stanford Jr. University (Palo Alto, CA) OAK
DOE Contract Number:  
FG03-92ER14304
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
optical; heterodyne; detection; cavity; ring-down; spectroscopy; performing; crds; wave; phase; ring-up; ru; sends; local; oscillator; signal; preferably; resonator; derives; interference; combined; polarization; combining; arrangement; overlapping; photodetector; receives; generates; current; therefrom; frequency; differences; waves; adjustable; cavity ring-down; ring-down spectroscopy; phase difference; local oscillator; phase differences; optical heterodyne; heterodyne detection; ring-down phase; interference signal; signal wave; /356/

Citation Formats

Levenson, Marc D., Paldus, Barbara A., and Zare, Richard N. Optical heterodyne detection for cavity ring-down spectroscopy. United States: N. p., 2000. Web.
Levenson, Marc D., Paldus, Barbara A., & Zare, Richard N. Optical heterodyne detection for cavity ring-down spectroscopy. United States.
Levenson, Marc D., Paldus, Barbara A., and Zare, Richard N. Tue . "Optical heterodyne detection for cavity ring-down spectroscopy". United States. https://www.osti.gov/servlets/purl/873117.
@article{osti_873117,
title = {Optical heterodyne detection for cavity ring-down spectroscopy},
author = {Levenson, Marc D. and Paldus, Barbara A. and Zare, Richard N.},
abstractNote = {A cavity ring-down system for performing cavity ring-down spectroscopy (CRDS) using optical heterodyne detection of a ring-down wave E.sub.RD during a ring-down phase or a ring-up wave E.sub.RU during a ring up phase. The system sends a local oscillator wave E.sub.LO and a signal wave E.sub.SIGNAL to the cavity, preferably a ring resonator, and derives an interference signal from the combined local oscillator wave E.sub.LO and the ring-down wave E.sub.RD (or ring-up wave E.sub.RU). The local oscillator wave E.sub.LO has a first polarization and the ring-down wave E.sub.RD has a second polarization different from the first polarization. The system has a combining arrangement for combining or overlapping local oscillator wave E.sub.LO and the ring-down wave E.sub.RD at a photodetector, which receives the interference signal and generates a heterodyne current I.sub.H therefrom. Frequency and phase differences between the waves are adjustable.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {7}
}

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