Development of an external cavity quantum cascade laser spectrometer at 7.5 μm for gas detection

Mammez, Dominique; Vallon, R.; Parvitte, B.; Mammez, Marie-Hélène; Carras, Mathieu; Zéninari, V.

doi:10.1007/s00340-014-5782-5

Cited by 7 publications

(3 citation statements)

References 14 publications

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“…Further suppressing the inherent longitudinal modes inside the laser cavity by depositing an anti-reflected (AR) coating on the single aperture facet to increase external feedback can then increase the frequency tuning range. [14][15][16]…”

Section: Frequency Tunable Phase-locked Array Based On External Cavitymentioning

confidence: 99%

Tunable characteristic of phase-locked quantum cascade laser arrays*

Zhang

Wang

et al. 2021

Chinese Phys. B

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A multimode interference (MMI) structure is designed to simplify the fabrication of quantum cascade laser (QCL) phase-locked arrays. The MMI geometry is optimized with a sufficient output channel distance to accommodate conventional photolithography and wet etching process by which power amplifier array is fabricated without using the complicated two-step etching-regrowth or dry etching technique. The far-field pattern with periodically modulated peaks reveals that the beams from the arrays are phase-locked. Furthermore, the frequency tuning performance of the MMI-based phase-locked arrays is studied using the Littrow-configuration external cavity structure. A wavelength tuning range of more than 60 cm −1 is demonstrated, which will eventually realize the high power, frequency tunable, large-scale phase-locked arrays, and their application in spectroscopy.

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Section: Frequency Tunable Phase-locked Array Based On External Cavitymentioning

confidence: 99%

Tunable characteristic of phase-locked quantum cascade laser arrays*

Zhang

Wang

et al. 2021

Chinese Phys. B

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“…The continuous rotation method provided good results for a shorter acquisition time. A continuous wave emission from 1293 up to 1350 cm −1 was demonstrated, and measurements on acetone (C 3 H 6 O) and phosphoryl chloride (POCl 3 ) were realized [ 53 ]. The use of an EC system also allows to perform Intra-Cavity Laser Absorption Spectroscopy (ICLAS) where the gas sample is placed within the laser resonator (see Figure 8 b).…”

Section: External-cavity Quantum Cascade Laser (Ec Qcl)mentioning

confidence: 99%

“…Based on the same principle, an EC QCL spectrometer was designed in the lab at 7.5 μm. The QCL and its anti-reflection coating were specially developed for this application [ 53 ]. A continuous wave emission from 1293 up to 1350 cm −1 was demonstrated, and measurements on acetone (C 3 H 6 O) and phosphoryl chloride (POCl 3 ) were realized.…”

Section: Introductionmentioning

confidence: 99%

Widely-Tunable Quantum Cascade-Based Sources for the Development of Optical Gas Sensors

Zéninari

Vallon

Bizet

et al. 2020

Sensors

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Spectroscopic techniques based on Distributed FeedBack (DFB) Quantum Cascade Lasers (QCL) provide good results for gas detection in the mid-infrared region in terms of sensibility and selectivity. The main limitation is the QCL relatively low tuning range (~10 cm−1) that prevents from monitoring complex species with broad absorption spectra in the infrared region or performing multi-gas sensing. To obtain a wider tuning range, the first solution presented in this paper consists of the use of a DFB QCL array. Tuning ranges from 1335 to 1387 cm−1 and from 2190 to 2220 cm−1 have been demonstrated. A more common technique that will be presented in a second part is to implement a Fabry–Perot QCL chip in an external-cavity (EC) system so that the laser could be tuned on its whole gain curve. The use of an EC system also allows to perform Intra-Cavity Laser Absorption Spectroscopy, where the gas sample is placed within the laser resonator. Moreover, a technique only using the QCL compliance voltage technique can be used to retrieve the spectrum of the gas inside the cavity, thus no detector outside the cavity is needed. Finally, a specific scheme using an EC coherent QCL array can be developed. All these widely-tunable Quantum Cascade-based sources can be used to demonstrate the development of optical gas sensors.

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