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Title: Method of increasing power within an optical cavity with long path lengths

Abstract

A cavity-enhanced absorption spectroscopy instrument has an optical cavity with two or more cavity mirrors, one mirror of which having a hole or other aperture for injecting a light beam, and the same or another mirror of which being partially transmissive to allow exit of light to a detector. A spherical-spherical configuration with at least one astigmatic mirror or a spherical-cylindrical configuration where the spherical mirror could also be astigmatic prevents a reentrant condition wherein the injected beam would prematurely exit the cavity through the aperture. This combination substantially increases the number of passes of the injected beam through a sample volume for sensitive detection of chemical species even in less than ideal conditions including low power laser or LED sources, poor mirror reflectivity or detector noise at the wavelengths of interest, or cavity alignment issues such as vibration or temperature and pressure changes.

Inventors:
;
Publication Date:
Research Org.:
ABB, Inc., Cary, NC (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1426789
Patent Number(s):
9,915,562
Application Number:
15/235,401
Assignee:
ABB, Inc., Cary, NC CHO
DOE Contract Number:
SC0007654
Resource Type:
Patent
Resource Relation:
Patent File Date: 2016 Aug 12
Country of Publication:
United States
Language:
English

Citation Formats

Leen, John Brian, and Bramall, Nathan E. Method of increasing power within an optical cavity with long path lengths. United States: N. p., 2018. Web.
Leen, John Brian, & Bramall, Nathan E. Method of increasing power within an optical cavity with long path lengths. United States.
Leen, John Brian, and Bramall, Nathan E. Tue . "Method of increasing power within an optical cavity with long path lengths". United States. doi:. https://www.osti.gov/servlets/purl/1426789.
@article{osti_1426789,
title = {Method of increasing power within an optical cavity with long path lengths},
author = {Leen, John Brian and Bramall, Nathan E.},
abstractNote = {A cavity-enhanced absorption spectroscopy instrument has an optical cavity with two or more cavity mirrors, one mirror of which having a hole or other aperture for injecting a light beam, and the same or another mirror of which being partially transmissive to allow exit of light to a detector. A spherical-spherical configuration with at least one astigmatic mirror or a spherical-cylindrical configuration where the spherical mirror could also be astigmatic prevents a reentrant condition wherein the injected beam would prematurely exit the cavity through the aperture. This combination substantially increases the number of passes of the injected beam through a sample volume for sensitive detection of chemical species even in less than ideal conditions including low power laser or LED sources, poor mirror reflectivity or detector noise at the wavelengths of interest, or cavity alignment issues such as vibration or temperature and pressure changes.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Mar 13 00:00:00 EDT 2018},
month = {Tue Mar 13 00:00:00 EDT 2018}
}

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