Long wavelength quantum cascade laser and gas sensing application

Since the establishment of the theoretical concept of the Quantum Cascade Laser in the 1970s, this innovative new type of semiconductor laser has been through significant development. Different from traditional semiconductor lasers, beam generation of the quantum cascade laser is based on quantum me...

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Main Author: Li, Yishun
Other Authors: Wang Qijie
Format: Thesis-Master by Coursework
Language:English
Published: Nanyang Technological University 2023
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Online Access:https://hdl.handle.net/10356/171833
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1718332023-11-10T15:44:49Z Long wavelength quantum cascade laser and gas sensing application Li, Yishun Wang Qijie School of Electrical and Electronic Engineering qjwang@ntu.edu.sg Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics Engineering::Electrical and electronic engineering::Applications of electronics Since the establishment of the theoretical concept of the Quantum Cascade Laser in the 1970s, this innovative new type of semiconductor laser has been through significant development. Different from traditional semiconductor lasers, beam generation of the quantum cascade laser is based on quantum mechanical phenomena. A noticeable advantage of the quantum cascade laser is the high wavelength tunability. By manipulating the design in quantum wells and barriers, the Quantum Cascade Laser can achieve specific absorption spectrum that allows for a wide range of applications. Another benefit for the quantum cascade laser is its high output power with significantly improved power efficiency, allowing for highly focused beam facilitating its application in biological or material science. The major goal of this dissertation is to investigate the performance of mid-infrared laser upon gas sensing. First, we reviewed recent literature about the history of semiconductor lasers and discussed the advantages of quantum cascade lasers. To compare the performance of several different designs of quantum cascade lasers, we simulated distinct designs of laser structures and characterized the performance by measuring the light-current-voltage and spectral characteristics. We found that the waveguide structure of the laser is the major factor that determines quantum cascade laser performance. Factors that impact the waveguide structures include structure optimization as well as the device fabrication process. As a conclusion, based on our findings in the elements that are essential for laser performance, we discussed recent development tendency in this field and assess the further direction of the quantum cascade laser design. We emphasized that specific designs for the waveguide structure will be the most important aspect to consider when applying the quantum cascade laser in spectroscopy, environmental monitoring, or other applications. Master of Science (Electronics) 2023-11-09T08:19:41Z 2023-11-09T08:19:41Z 2023 Thesis-Master by Coursework Li, Y. (2023). Long wavelength quantum cascade laser and gas sensing application. Master's thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/171833 https://hdl.handle.net/10356/171833 en ISM-DISS-02691 application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics
Engineering::Electrical and electronic engineering::Applications of electronics
spellingShingle Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics
Engineering::Electrical and electronic engineering::Applications of electronics
Li, Yishun
Long wavelength quantum cascade laser and gas sensing application
description Since the establishment of the theoretical concept of the Quantum Cascade Laser in the 1970s, this innovative new type of semiconductor laser has been through significant development. Different from traditional semiconductor lasers, beam generation of the quantum cascade laser is based on quantum mechanical phenomena. A noticeable advantage of the quantum cascade laser is the high wavelength tunability. By manipulating the design in quantum wells and barriers, the Quantum Cascade Laser can achieve specific absorption spectrum that allows for a wide range of applications. Another benefit for the quantum cascade laser is its high output power with significantly improved power efficiency, allowing for highly focused beam facilitating its application in biological or material science. The major goal of this dissertation is to investigate the performance of mid-infrared laser upon gas sensing. First, we reviewed recent literature about the history of semiconductor lasers and discussed the advantages of quantum cascade lasers. To compare the performance of several different designs of quantum cascade lasers, we simulated distinct designs of laser structures and characterized the performance by measuring the light-current-voltage and spectral characteristics. We found that the waveguide structure of the laser is the major factor that determines quantum cascade laser performance. Factors that impact the waveguide structures include structure optimization as well as the device fabrication process. As a conclusion, based on our findings in the elements that are essential for laser performance, we discussed recent development tendency in this field and assess the further direction of the quantum cascade laser design. We emphasized that specific designs for the waveguide structure will be the most important aspect to consider when applying the quantum cascade laser in spectroscopy, environmental monitoring, or other applications.
author2 Wang Qijie
author_facet Wang Qijie
Li, Yishun
format Thesis-Master by Coursework
author Li, Yishun
author_sort Li, Yishun
title Long wavelength quantum cascade laser and gas sensing application
title_short Long wavelength quantum cascade laser and gas sensing application
title_full Long wavelength quantum cascade laser and gas sensing application
title_fullStr Long wavelength quantum cascade laser and gas sensing application
title_full_unstemmed Long wavelength quantum cascade laser and gas sensing application
title_sort long wavelength quantum cascade laser and gas sensing application
publisher Nanyang Technological University
publishDate 2023
url https://hdl.handle.net/10356/171833
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