Optical feedback cavity-enhanced absorption spectroscopy with a 3.24 μm interband cascade laser

K. M. Manfred; G. A.D. Ritchie; N. Lang; J. Röpcke; J. H. Van Helden

doi:10.1063/1.4922149

Optical feedback cavity-enhanced absorption spectroscopy with a 3.24 μm interband cascade laser

K. M. Manfred, G. A.D. Ritchie, N. Lang, J. Röpcke, J. H. Van Helden^*

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

The development of interband cascade lasers (ICLs) has made the strong C-H transitions in the 3 μm spectral region increasingly accessible. We present the demonstration of a single mode distributed feedback ICL coupled to a V-shaped optical cavity in an optical feedback cavity-enhanced absorption spectroscopy (OF-CEAS) experiment. We achieved a minimum detectable absorption coefficient, α_min, of (7.1±0.2) × 10-8 cm^-1 for a spectrum of CH₄ at 3.24 μm with a two second acquisition time (100 scans averaged). This corresponds to a detection limit of 3 ppb CH₄ at atmospheric pressure, which is comparable to previously reported OF-CEAS instruments with diode lasers or quantum cascade lasers. The ability to frequency lock an ICL source in the important 3 μm region to an optical cavity holds great promise for future spectroscopic applications.

Original language	English
Article number	221106
Number of pages	4
Journal	Applied Physics Letters
Volume	106
Issue number	22
DOIs	https://doi.org/10.1063/1.4922149
Publication status	Published - 1 Jun 2015

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10.1063/1.4922149

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abstract = "The development of interband cascade lasers (ICLs) has made the strong C-H transitions in the 3 μm spectral region increasingly accessible. We present the demonstration of a single mode distributed feedback ICL coupled to a V-shaped optical cavity in an optical feedback cavity-enhanced absorption spectroscopy (OF-CEAS) experiment. We achieved a minimum detectable absorption coefficient, αmin, of (7.1±0.2) × 10-8 cm-1 for a spectrum of CH4 at 3.24 μm with a two second acquisition time (100 scans averaged). This corresponds to a detection limit of 3 ppb CH4 at atmospheric pressure, which is comparable to previously reported OF-CEAS instruments with diode lasers or quantum cascade lasers. The ability to frequency lock an ICL source in the important 3 μm region to an optical cavity holds great promise for future spectroscopic applications.",

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AU - Manfred, K. M.

AU - Ritchie, G. A.D.

AU - Lang, N.

AU - Röpcke, J.

AU - Van Helden, J. H.

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N2 - The development of interband cascade lasers (ICLs) has made the strong C-H transitions in the 3 μm spectral region increasingly accessible. We present the demonstration of a single mode distributed feedback ICL coupled to a V-shaped optical cavity in an optical feedback cavity-enhanced absorption spectroscopy (OF-CEAS) experiment. We achieved a minimum detectable absorption coefficient, αmin, of (7.1±0.2) × 10-8 cm-1 for a spectrum of CH4 at 3.24 μm with a two second acquisition time (100 scans averaged). This corresponds to a detection limit of 3 ppb CH4 at atmospheric pressure, which is comparable to previously reported OF-CEAS instruments with diode lasers or quantum cascade lasers. The ability to frequency lock an ICL source in the important 3 μm region to an optical cavity holds great promise for future spectroscopic applications.

AB - The development of interband cascade lasers (ICLs) has made the strong C-H transitions in the 3 μm spectral region increasingly accessible. We present the demonstration of a single mode distributed feedback ICL coupled to a V-shaped optical cavity in an optical feedback cavity-enhanced absorption spectroscopy (OF-CEAS) experiment. We achieved a minimum detectable absorption coefficient, αmin, of (7.1±0.2) × 10-8 cm-1 for a spectrum of CH4 at 3.24 μm with a two second acquisition time (100 scans averaged). This corresponds to a detection limit of 3 ppb CH4 at atmospheric pressure, which is comparable to previously reported OF-CEAS instruments with diode lasers or quantum cascade lasers. The ability to frequency lock an ICL source in the important 3 μm region to an optical cavity holds great promise for future spectroscopic applications.

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Optical feedback cavity-enhanced absorption spectroscopy with a 3.24 μm interband cascade laser

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Katherine Manfred

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Optical feedback cavity-enhanced absorption spectroscopy with a 3.24 μm interband cascade laser

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