Wavelength modulated multiheterodyne spectroscopy using Fabry-Pérot quantum cascade lasers

Andreas Hangauer; Jonas Westberg; Eric Zhang; Gerard Wysocki

doi:10.1364/OE.24.025298

Wavelength modulated multiheterodyne spectroscopy using Fabry-Pérot quantum cascade lasers

Andreas Hangauer, Jonas Westberg, Eric Zhang, Gerard Wysocki

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

17 Scopus citations

Abstract

Multiheterodyne spectroscopy implemented with semiconductor Fabry-Pérot lasers is a method for broadband (> 20 cm^-1), high spectral resolution (∼1 MHz) and high time resolution (< 1 μs/spectrum) spectroscopy with no moving parts utilizing off-the-shelf laser sources. The laser stabilization approach demonstrated here enables continuous frequency tuning (at 12.5 Hz repetition rate) while allowing for multiheterodyne wavelength modulation spectroscopy (WMS). Spectroscopic detection of N₂O around 1185 cm^-1 is experimentally realized, which shows a direct absorption sensitivity limit of ∼1.5×10^-3/√Hz fractional absorption per mode. This can be lowered using WMS down to 5×10^-4/√Hz per mode, limited by optical fringes. This approaches the range of sensitivities of standard single-mode laser based spectrometers, which demonstrates that the multiheterodyne method is well-suited for chemical sensing of spectrally broadened absorption features or for multi-species measurements.

Original language	English (US)
Pages (from-to)	25298-25307
Number of pages	10
Journal	Optics Express
Volume	24
Issue number	22
DOIs	https://doi.org/10.1364/OE.24.025298
State	Published - Oct 31 2016

All Science Journal Classification (ASJC) codes

Atomic and Molecular Physics, and Optics

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10.1364/OE.24.025298

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title = "Wavelength modulated multiheterodyne spectroscopy using Fabry-P{\'e}rot quantum cascade lasers",

abstract = "Multiheterodyne spectroscopy implemented with semiconductor Fabry-P{\'e}rot lasers is a method for broadband (> 20 cm-1), high spectral resolution (∼1 MHz) and high time resolution (< 1 μs/spectrum) spectroscopy with no moving parts utilizing off-the-shelf laser sources. The laser stabilization approach demonstrated here enables continuous frequency tuning (at 12.5 Hz repetition rate) while allowing for multiheterodyne wavelength modulation spectroscopy (WMS). Spectroscopic detection of N2O around 1185 cm-1 is experimentally realized, which shows a direct absorption sensitivity limit of ∼1.5×10-3/√Hz fractional absorption per mode. This can be lowered using WMS down to 5×10-4/√Hz per mode, limited by optical fringes. This approaches the range of sensitivities of standard single-mode laser based spectrometers, which demonstrates that the multiheterodyne method is well-suited for chemical sensing of spectrally broadened absorption features or for multi-species measurements.",

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AU - Hangauer, Andreas

AU - Westberg, Jonas

AU - Zhang, Eric

AU - Wysocki, Gerard

PY - 2016/10/31

Y1 - 2016/10/31

N2 - Multiheterodyne spectroscopy implemented with semiconductor Fabry-Pérot lasers is a method for broadband (> 20 cm-1), high spectral resolution (∼1 MHz) and high time resolution (< 1 μs/spectrum) spectroscopy with no moving parts utilizing off-the-shelf laser sources. The laser stabilization approach demonstrated here enables continuous frequency tuning (at 12.5 Hz repetition rate) while allowing for multiheterodyne wavelength modulation spectroscopy (WMS). Spectroscopic detection of N2O around 1185 cm-1 is experimentally realized, which shows a direct absorption sensitivity limit of ∼1.5×10-3/√Hz fractional absorption per mode. This can be lowered using WMS down to 5×10-4/√Hz per mode, limited by optical fringes. This approaches the range of sensitivities of standard single-mode laser based spectrometers, which demonstrates that the multiheterodyne method is well-suited for chemical sensing of spectrally broadened absorption features or for multi-species measurements.

AB - Multiheterodyne spectroscopy implemented with semiconductor Fabry-Pérot lasers is a method for broadband (> 20 cm-1), high spectral resolution (∼1 MHz) and high time resolution (< 1 μs/spectrum) spectroscopy with no moving parts utilizing off-the-shelf laser sources. The laser stabilization approach demonstrated here enables continuous frequency tuning (at 12.5 Hz repetition rate) while allowing for multiheterodyne wavelength modulation spectroscopy (WMS). Spectroscopic detection of N2O around 1185 cm-1 is experimentally realized, which shows a direct absorption sensitivity limit of ∼1.5×10-3/√Hz fractional absorption per mode. This can be lowered using WMS down to 5×10-4/√Hz per mode, limited by optical fringes. This approaches the range of sensitivities of standard single-mode laser based spectrometers, which demonstrates that the multiheterodyne method is well-suited for chemical sensing of spectrally broadened absorption features or for multi-species measurements.

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Wavelength modulated multiheterodyne spectroscopy using Fabry-Pérot quantum cascade lasers

Abstract

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