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http://arks.princeton.edu/ark:/88435/dsp01gt54kr14w
Title: | A 3.4 μm Quantum Cascade Laser for Photocatalytic Decomposition of Methane |
Authors: | Kaplan, Alexander "Alex" |
Advisors: | Gmachl, Claire F |
Department: | Physics |
Certificate Program: | Sustainable Energy Program |
Class Year: | 2021 |
Abstract: | Quantum Cascade Lasers (QCLs) are quantum devices that generate mid- to far- infrared light at a specified wavelength via intersubband electronic transitions. In this thesis, we present a high optical power QCL at 3.4 μm, designed for the photocatalytic degradation of methane for hydrogen production, CH4 → C + 2H2. We review the photocatalytic degradation of methane as a promising, low greenhouse gas emission hydrogen production pathway in order to motivate the laser design. We also derive and present essential parameters governing electron physics in a QCL, including the semiconductor band structures and electronic states in multiple quantum wells. The QCL design presented has a calculated emission wavelength of 3.4 μm and period length 25-40% shorter than existing short wavelength QCLs, enabling up to 40% greater optical power. The design is based on the strained Al0.64In0.36As/In0.67Ga0.33As system, and it presents a novel technique for direct coupling of the lower laser level to the injector in order to increase the optical transition energy. |
URI: | http://arks.princeton.edu/ark:/88435/dsp01gt54kr14w |
Type of Material: | Princeton University Senior Theses |
Language: | en |
Appears in Collections: | Physics, 1936-2023 |
Files in This Item:
File | Description | Size | Format | |
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KAPLAN-ALEX-THESIS.pdf | 15.19 MB | Adobe PDF | Request a copy |
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