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Development of a terahertz gas laser optically pumped by a mid-infrared quantum cascade laser

Zubairova, Alsu (2019) Development of a terahertz gas laser optically pumped by a mid-infrared quantum cascade laser. Master's.

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Abstract

A compact continuous-wave terahertz laser was realized by optically pumping 15NH3 with a mid-infrared Quantum cascade laser operating at room temperature. Three methods for the mid-infrared spectroscopy were studied in order to identify and characterize suitable gain media and pump transitions. Transmission spectroscopy with a microbolometer camera proved to be the best suited method for this purpose. Three molecular species that could be used as a gain media were studied. Saturation was detected for 15NH3 and several molecular resonances that could be used to get THz lasing were identified. A measurement routine that would allow to search for terahertz lasing was developed. As a result, laser emission was found for five transitions of 15NH3 producing radiation at 4.52 THz with up to 8 µW optical power and optical conversion efficiency of 4.2E-5 . The dependence of the acquired results on several important operating parameters (such as pressure, cavity length and pump power) was studied and possible ways for further improvements were suggested.

Item URL in elib:https://elib.dlr.de/132917/
Document Type:Thesis (Master's)
Title:Development of a terahertz gas laser optically pumped by a mid-infrared quantum cascade laser
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Zubairova, AlsuHumboldt Universität zu BerlinUNSPECIFIED
Date:2019
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:54
Status:Published
Keywords:Terahertz-Gaslaser, Quantenkaskadenlaser
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:other
DLR - Research area:Raumfahrt
DLR - Program:R - no assignment
DLR - Research theme (Project):R - no assignment
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy
Deposited By: Wienold, Martin
Deposited On:18 Dec 2019 08:39
Last Modified:18 Dec 2019 08:39

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