Author : Afusat Olayinka Dirisu
Publisher :
ISBN 13 : 9780549967583
Total Pages : 468 pages
Book Rating : 4.9/5 (675 download)
Book Synopsis Design, Fabrication, and Optimization of Quantum Cascade Laser Cavities and Spectroscopy of the Intersubband Gain by : Afusat Olayinka Dirisu
Download or read book Design, Fabrication, and Optimization of Quantum Cascade Laser Cavities and Spectroscopy of the Intersubband Gain written by Afusat Olayinka Dirisu and published by . This book was released on 2009 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis was focused on the improvement of QC lasers through the design and optimization of the laser cavity and characterization of the laser gain medium. The optimization of the laser cavity included, (1) the design and fabrication of high reflection Bragg gratings and subwavelength antireflection gratings, by focused ion beam milling, to achieve tunable, single mode and high power QC lasers, and (2) modeling of slab-coupled optical waveguide QC lasers for high brightness output beams. The characterization of the QC laser gain medium was carried out using the single-pass transmission experiment, a sensitive measurement technique, for probing the intersubband transitions and the electron distribution of QC lasers under different temperatures and applied bias conditions, unlike typical infrared measurement techniques that are restricted to non-functional devices. With the single-pass technique, basic understanding of the physics behind the workings of the QC laser gain can be achieved, which is invaluable in the design of QC lasers with high output power and high operating temperatures.