2026-09-19T08:28:05Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/930732021-07-05T14:03:20Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023
Qing Hu.
Cai, Xiaowei, Ph.D. Massachusetts Institute of Technology
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science.
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
2015-01-20T18:00:17Z
2015-01-20T18:00:17Z
2014
2014
http://hdl.handle.net/1721.1/93073
900011415
Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 105-110).
One of the most important applications for Terahertz (THz) quantum cascade (QC) lasers is to provide compact and powerful frequency-stabilized solid-state sources as local oscillators in heterodyne receivers for astronomical studies. The first part of the thesis is dedicated to the device cavity design, fabrication and characterization of the microstrip antenna coupled third-order distributed feedback QC lasers aimed for 2.060 THz atomic oxygen line. THz travelling-wave QC amplifiers are highly desired to achieve broadband amplification of THz radiation in free space. The second part of the thesis focuses on the development of 4.3 THz travelling-wave QC amplifier by monolithically integrating horn antennas and attaching silicon lenses at the metal-metal waveguide facets.
by Xiaowei Cai.
S.M.
110 pages
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.
http://dspace.mit.edu/handle/1721.1/7582
Electrical Engineering and Computer Science.
Efficient THz lasers and broadband amplifiers based on quantum cascade gain media
Efficient Terahertz lasers and broadband amplifiers based on QC gain media
Thesis
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<Abstract>One of the most important applications for Terahertz (THz) quantum cascade (QC) lasers is to provide compact and powerful frequency-stabilized solid-state sources as local oscillators in heterodyne receivers for astronomical studies. The first part of the thesis is dedicated to the device cavity design, fabrication and characterization of the microstrip antenna coupled third-order distributed feedback QC lasers aimed for 2.060 THz atomic oxygen line. THz travelling-wave QC amplifiers are highly desired to achieve broadband amplification of THz radiation in free space. The second part of the thesis focuses on the development of 4.3 THz travelling-wave QC amplifier by monolithically integrating horn antennas and attaching silicon lenses at the metal-metal waveguide facets.</Abstract>
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