Accession Number:

ADA413526

Title:

Building Blocks for Time-Resolved Laser Emission in Mid-Infrared Quantum Well Lasers

Descriptive Note:

Master's thesis Aug 2002-Mar 2003

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT

Personal Author(s):

Report Date:

2003-03-01

Pagination or Media Count:

107.0

Abstract:

The objective of this research is to improve the performance of mid-infrared semiconductor quantum-well lasers. Lasers operating in the mid-infrared are useful for many Air Force applications which include infrared IR countermeasures in particular. Countermeasure applications require lasers that are compact, and able to emit at high powers while operating at room temperature. Limits to power increases are seen in the transverse modal development of laser oscillation. These modes typically form in the waveguiding active region contributing to the laser output. However, competing modes outside of this region also develop when the confining structural layers have the right characteristics. These competing modes may draw power away from the main lasing mode, causing efficiency to drop. Therefore, theoretical models indicate that these ghost modes should be extinguished. The goal of this work is to incorporate antimony-based semiconductor laser devices into a time-resolved photoluminescence TRPL experiment to examine modal development immediately after excitation. TRPL utilizes a non-linear wave mixing technique known as frequency upconversion to resolve sub-picosecond luminescence occurrences after excitation. Modification to the experiment is performed to produce laser emission from five mid-IR semiconductor laser samples. Both spontaneous and stimulated emission spectra are recorded. Alignment of the experiment is also carried out to produce upconversion of the PL signal to prepare for the incorporation of laser emission.

Subject Categories:

  • Lasers and Masers
  • Atomic and Molecular Physics and Spectroscopy
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE