Recovery of Absorption Line Shapes With Correction for the Wavelength Modulation Characteristics of DFB Lasers
Tunable diode laser spectroscopy combined with wavelength modulation spectroscopy (WMS) is an important technique for noninvasive measurements of gas parameters such as pressure, concentration, and temperature in high-noise harsh environments. A variety of laser types are used for these applications...
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IEEE
2016-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/7464820/ |
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| author | Thomas Benoy Michael Lengden George Stewart Walter Johnstone |
| author_facet | Thomas Benoy Michael Lengden George Stewart Walter Johnstone |
| author_sort | Thomas Benoy |
| collection | DOAJ |
| description | Tunable diode laser spectroscopy combined with wavelength modulation spectroscopy (WMS) is an important technique for noninvasive measurements of gas parameters such as pressure, concentration, and temperature in high-noise harsh environments. A variety of laser types are used for these applications, and the modulation characteristics can have significant effects on line shape recovery. Here, we identify important characteristics of distributed feedback (DFB) lasers that need to be taken into account in the context of WMS and illustrate the effects with a 2- <inline-formula> <tex-math notation="LaTeX">$\mu\textrm{m}$</tex-math></inline-formula> wavelength multiquantum-well DFB laser used for CO<sub>2</sub> detection. The modulation response of the laser is measured, and we demonstrate how the phasor decomposition method (PDM) may be used to obtain accurate line shapes from the first harmonic WMS signals by correcting for phase variation across the laser's low-frequency current sweep. We also demonstrate how the PDM approach can be improved by removing the need to preset the orientation of the lock-in axis to isolate the residual amplitude modulation component, making it more suitable for field applications. |
| format | Article |
| id | doaj-art-449d30db33c148dbaaa0a6fac471c01b |
| institution | Matheson Library |
| issn | 1943-0655 |
| language | English |
| publishDate | 2016-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj-art-449d30db33c148dbaaa0a6fac471c01b2025-07-01T23:13:40ZengIEEEIEEE Photonics Journal1943-06552016-01-018311710.1109/JPHOT.2016.25585047464820Recovery of Absorption Line Shapes With Correction for the Wavelength Modulation Characteristics of DFB LasersThomas Benoy0Michael Lengden1George Stewart2Walter Johnstone3Centre for Microsystems and Photonics, Department of Electronic and Electrical Engineering, University of Strathclyde, Glasgow, U.K.Centre for Microsystems and Photonics, Department of Electronic and Electrical Engineering, University of Strathclyde, Glasgow, U.K.Centre for Microsystems and Photonics, Department of Electronic and Electrical Engineering, University of Strathclyde, Glasgow, U.K.Centre for Microsystems and Photonics, Department of Electronic and Electrical Engineering, University of Strathclyde, Glasgow, U.K.Tunable diode laser spectroscopy combined with wavelength modulation spectroscopy (WMS) is an important technique for noninvasive measurements of gas parameters such as pressure, concentration, and temperature in high-noise harsh environments. A variety of laser types are used for these applications, and the modulation characteristics can have significant effects on line shape recovery. Here, we identify important characteristics of distributed feedback (DFB) lasers that need to be taken into account in the context of WMS and illustrate the effects with a 2- <inline-formula> <tex-math notation="LaTeX">$\mu\textrm{m}$</tex-math></inline-formula> wavelength multiquantum-well DFB laser used for CO<sub>2</sub> detection. The modulation response of the laser is measured, and we demonstrate how the phasor decomposition method (PDM) may be used to obtain accurate line shapes from the first harmonic WMS signals by correcting for phase variation across the laser's low-frequency current sweep. We also demonstrate how the PDM approach can be improved by removing the need to preset the orientation of the lock-in axis to isolate the residual amplitude modulation component, making it more suitable for field applications.https://ieeexplore.ieee.org/document/7464820/Diode laser spectroscopyabsorption line-shape recoverylaser modulationwavelength modulation spectroscopyoptical gas sensors |
| spellingShingle | Thomas Benoy Michael Lengden George Stewart Walter Johnstone Recovery of Absorption Line Shapes With Correction for the Wavelength Modulation Characteristics of DFB Lasers IEEE Photonics Journal Diode laser spectroscopy absorption line-shape recovery laser modulation wavelength modulation spectroscopy optical gas sensors |
| title | Recovery of Absorption Line Shapes With Correction for the Wavelength Modulation Characteristics of DFB Lasers |
| title_full | Recovery of Absorption Line Shapes With Correction for the Wavelength Modulation Characteristics of DFB Lasers |
| title_fullStr | Recovery of Absorption Line Shapes With Correction for the Wavelength Modulation Characteristics of DFB Lasers |
| title_full_unstemmed | Recovery of Absorption Line Shapes With Correction for the Wavelength Modulation Characteristics of DFB Lasers |
| title_short | Recovery of Absorption Line Shapes With Correction for the Wavelength Modulation Characteristics of DFB Lasers |
| title_sort | recovery of absorption line shapes with correction for the wavelength modulation characteristics of dfb lasers |
| topic | Diode laser spectroscopy absorption line-shape recovery laser modulation wavelength modulation spectroscopy optical gas sensors |
| url | https://ieeexplore.ieee.org/document/7464820/ |
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