Chirped laser dispersion spectroscopy with harmonic detection of molecular spectra

M. Nikodem; D. Weidmann; Gerard Wysocki

doi:10.1007/s00340-012-5060-3

Chirped laser dispersion spectroscopy with harmonic detection of molecular spectra

M. Nikodem, D. Weidmann, Gerard Wysocki

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51 Scopus citations

Abstract

Chirped laser dispersion spectroscopy (CLaDS) has been introduced recently as a technique that performs molecular detection based on measurement of optical dispersion. In this paper, a new detection scheme based on chirp modulation (CM) and subsequent phase-sensitive detection is described. CM-CLaDS inherits the full advantages of conventional CLaDS and additionally overcomes some of its limitations. A prototype CM-CLaDS instrument has been developed and characterized in laboratory conditions. The system is based on a distributed feedback quantum cascade laser which operates around 4.52 μm and can probe the most intense nitrous oxide (N₂O) ro-vibrational transitions. Preliminary performance tests are presented and provide a path/bandwidth normalized minimum N₂O detection limit below 100 ppbv m/Hz ^1/2.

Original language	English (US)
Pages (from-to)	477-483
Number of pages	7
Journal	Applied Physics B: Lasers and Optics
Volume	109
Issue number	3
DOIs	https://doi.org/10.1007/s00340-012-5060-3
State	Published - Nov 2012

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)
General Physics and Astronomy

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10.1007/s00340-012-5060-3

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title = "Chirped laser dispersion spectroscopy with harmonic detection of molecular spectra",

abstract = "Chirped laser dispersion spectroscopy (CLaDS) has been introduced recently as a technique that performs molecular detection based on measurement of optical dispersion. In this paper, a new detection scheme based on chirp modulation (CM) and subsequent phase-sensitive detection is described. CM-CLaDS inherits the full advantages of conventional CLaDS and additionally overcomes some of its limitations. A prototype CM-CLaDS instrument has been developed and characterized in laboratory conditions. The system is based on a distributed feedback quantum cascade laser which operates around 4.52 μm and can probe the most intense nitrous oxide (N2O) ro-vibrational transitions. Preliminary performance tests are presented and provide a path/bandwidth normalized minimum N2O detection limit below 100 ppbv m/Hz 1/2.",

author = "M. Nikodem and D. Weidmann and Gerard Wysocki",

note = "Funding Information: The authors acknowledge the financial support by the NSF CAREER award CMMI-0954897 and partial support by the MIRTHE NSF Engineering Research Center. Dr. Chung-En Zah from Corning Inc. is acknowledged for providing a laser for this study.",

year = "2012",

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doi = "10.1007/s00340-012-5060-3",

language = "English (US)",

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pages = "477--483",

journal = "Applied Physics B: Lasers and Optics",

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T1 - Chirped laser dispersion spectroscopy with harmonic detection of molecular spectra

AU - Nikodem, M.

AU - Weidmann, D.

AU - Wysocki, Gerard

N1 - Funding Information: The authors acknowledge the financial support by the NSF CAREER award CMMI-0954897 and partial support by the MIRTHE NSF Engineering Research Center. Dr. Chung-En Zah from Corning Inc. is acknowledged for providing a laser for this study.

PY - 2012/11

Y1 - 2012/11

N2 - Chirped laser dispersion spectroscopy (CLaDS) has been introduced recently as a technique that performs molecular detection based on measurement of optical dispersion. In this paper, a new detection scheme based on chirp modulation (CM) and subsequent phase-sensitive detection is described. CM-CLaDS inherits the full advantages of conventional CLaDS and additionally overcomes some of its limitations. A prototype CM-CLaDS instrument has been developed and characterized in laboratory conditions. The system is based on a distributed feedback quantum cascade laser which operates around 4.52 μm and can probe the most intense nitrous oxide (N2O) ro-vibrational transitions. Preliminary performance tests are presented and provide a path/bandwidth normalized minimum N2O detection limit below 100 ppbv m/Hz 1/2.

AB - Chirped laser dispersion spectroscopy (CLaDS) has been introduced recently as a technique that performs molecular detection based on measurement of optical dispersion. In this paper, a new detection scheme based on chirp modulation (CM) and subsequent phase-sensitive detection is described. CM-CLaDS inherits the full advantages of conventional CLaDS and additionally overcomes some of its limitations. A prototype CM-CLaDS instrument has been developed and characterized in laboratory conditions. The system is based on a distributed feedback quantum cascade laser which operates around 4.52 μm and can probe the most intense nitrous oxide (N2O) ro-vibrational transitions. Preliminary performance tests are presented and provide a path/bandwidth normalized minimum N2O detection limit below 100 ppbv m/Hz 1/2.

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Chirped laser dispersion spectroscopy with harmonic detection of molecular spectra

Abstract

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