Spectroscopic Applications of Terahertz Quantum-Cascade Lasers

Language: English

Published by Cuvillier, Cuvillier Okt 2020, 2020

3736972970 / 9783736972971

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This item is printed on demand - Print on Demand Titel. Neuware -Quantum cascade lasers (QCLs) are attractive for high-resolution spectroscopy because they can provide high power and a narrow linewidth. They are particularly promising in the terahertz (THz) range since they can be used as local oscillators for heterodyne detection as well as transmitters for direct detection. However, THz QCL-based technologies are still under development and are limited by the lack of frequency tunability as well as the frequency and output power stability for free-running operation. In this dissertation, frequency tuning and linewidth of THz QCLs are studied in detail by using rotational spectroscopic features of molecular species. In molecular spectroscopy, the Doppler eff ect broadens the spectral lines of molecules in the gas phase at thermal equilibrium. Saturated absorption spectroscopy has been performed that allows for sub-Doppler resolution of the spectral features. One possible application is QCL frequency stabilization based on the Lamb dip. Since the tunability of the emission frequency is an essential requirement to use THz QCL for high-resolution spectroscopy, a new method has been developed that relies on near-infrared (NIR) optical excitation of the QCL rear-facet. A wide tuning range has been achieved by using this approach. The scheme is straightforward to implement, and the approach can be readily applied to a large class of THz QCLs. The frequency and output stability of the local oscillator has a direct impact on the performance and consistency of the heterodyne spectroscopy. A technique has been developed for a simultaneous stabilization of the frequency and output power by taking advantage of the frequency and power regulation by NIR excitation. The results presented in this thesis will enable the routine use of THz QCLs for spectroscopic applications in the near future.Cuvillier Verlag, Nonnenstieg 8, 37075 Göttingen 142 pp. Englisch.

Seller Inventory # 9783736972971

Title
Spectroscopic Applications of Terahertz Quantum-Cascade Lasers
Author
Tasmim Alam
Publisher
Cuvillier, Cuvillier Okt 2020
Publication year
2020
Condition
Neu
Binding
Taschenbuch
Language
English
ISBN 10
3736972970
ISBN 13
9783736972971
Item weight
194 grams
Dimensions
210x148x9 mm

buchversandmimpf2000

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