Abstract

Quantum Cascade Lasers have recently gained considerable attention for their capability to emit infrared radiation in a broad infrared spectral region, very compact dimensions, and high optical power/efficiency. Increasing continuous wave optical power is one of the main research directions in the field. A straightforward approach to increasing optical power in the pulsed regime is to increase number of stages in the cascade structure. However, due to a low active region thermal conductivity, the increase in number of stages leads to active region overheating in continuous wave operation. In this work, an alternative approach to power scaling with device dimensions is explored: number of stages is reduced to reduce active region thermal resistance, while active region lateral size is increased for reaching high optical power level. Using this approach, power scaling for active region width increase from 10µm to 20µm is demonstrated for the first time. An analysis based on a simple semi-empirical model suggests that laser power can be significantly improved by increasing characteristic temperature T0 that describes temperature dependence of laser threshold current density.

Notes

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Graduation Date

2017

Semester

Summer

Advisor

Lyakh, Arkadiy

Degree

Master of Science (M.S.)

College

College of Graduate Studies

Department

Nanoscience Technology Center

Degree Program

Nanotechnology

Format

application/pdf

Identifier

CFE0007137

URL

http://purl.fcla.edu/fcla/etd/CFE0007137

Language

English

Release Date

February 2023

Length of Campus-only Access

5 years

Access Status

Masters Thesis (Open Access)

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