Investigation of weak absorption and gain lines of some gases by the method of selective losses in a laser resonator

Belikova, T. P.; Sviridenkov, E. A.; Suchkov, A. F.

doi:10.1070/qe1974v004n04abeh006781

Cited by 8 publications

(1 citation statement)

References 4 publications

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“…The cavity output light can be detected to perform spectroscopy. This method, already well known in the visible [ 54 , 55 , 56 ] and the near infrared [ 57 , 58 , 59 , 60 ], is developing in the mid-infrared [ 61 , 62 ]. With a carefully optimized system, the effective pathlength can reach hundreds of kilometers, thus making it an appropriate technique for low absorption gases detection.…”

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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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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Applications of the Theory to Experimental Plasma Diagnostics

Oks

1995

Plasma Spectroscopy

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A comprehensive guide to intracavity absorption spectroscopy

Fjodorow

2024

Appl. Phys. B

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The enormous sensitivity of intracavity absorption spectroscopy (ICAS), as well as its unique ability to tolerate high broadband losses caused by, e.g., optical windows and light scattering, is being exploited by only a few research groups worldwide. The reason seems to be the lack of comprehensive literature, such that the field remains difficult to access for non-experts, in particular for engineers and chemists, who might derive the most benefits from applying ICAS. In particular, the missing connection to this target audience appears to be two-fold: (i) the seeming complexity of the theory, and (ii) the necessity to setup homemade laser systems. However, once some basic understanding and knowledge is obtained, both aspects appear to be of similar complexity as with other spectroscopic techniques. Therefore, the current work is aiming at (i) providing a comprehensive review of the theoretical basics of ICAS, and (ii) describing the most important practical aspects that need to be considered for a successful realization of ICAS measurements. To ensure maximum clarity, illustrative practical examples of recent work are used throughout the paper.

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Investigation of weak absorption and gain lines of some gases by the method of selective losses in a laser resonator

Cited by 8 publications

References 4 publications

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

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

Applications of the Theory to Experimental Plasma Diagnostics

A comprehensive guide to intracavity absorption spectroscopy

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