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Tsvid, Gene.

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Spectral gain measurements of quantum confined emitters, and design and fabrication of intersubband quantum box laser structures.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Spectral gain measurements of quantum confined emitters, and design and fabrication of intersubband quantum box laser structures./
Author:	Tsvid, Gene.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2008,
Description:	146 p.
Notes:	Source: Dissertations Abstracts International, Volume: 70-11, Section: B.
Contained By:	Dissertations Abstracts International70-11B.
Subject:	Electrical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3348942
ISBN:	9781109047790

Spectral gain measurements of quantum confined emitters, and design and fabrication of intersubband quantum box laser structures.
Tsvid, Gene.

Spectral gain measurements of quantum confined emitters, and design and fabrication of intersubband quantum box laser structures. - Ann Arbor : ProQuest Dissertations & Theses, 2008 - 146 p.

Source: Dissertations Abstracts International, Volume: 70-11, Section: B.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2008.

This item must not be sold to any third party vendors.

Semiconductor laser active regions are commonly characterized by photo- and electro-luminescence (PL, EL) and cavity length analysis. However quantitative spectral information is not readily extracted from PL and EL data and comparison of different active region materials can be difficult. More quantifiable spectral information is contained in the optical gain spectra. This work reports on spectral gain studies, using multi-segmented interband devices, of InGaAs quantum well and quantum dot active regions grown by metalorganic chemical vapor deposition (MOCVD). Using the fundamental connection between gain and spontaneous emission spectra, the spontaneous radiative current and spontaneous radiative efficiency is evaluated for these active regions. The spectral gain and spontaneous radiative efficiency measurements of 980 nm emitting InGaAs quantum well (QW) material provides a benchmark comparison to previous results obtained on highly-strained, 1200 nm emitting InGaAs QW material. These studies provide insight into carrier recombination and the role of the current injection efficiency in InGaAs QW lasers. The spectral gain of self-assembled MOCVD grown InGaAs quantum dots (QD) active regions are also investigated, allowing for comparison to InGaAs QW material. The second part of my talk will cover intersubband-transition QW and quantum-box (QB) lasers. Quantum cascade (QC) lasers have emerged as compact and technologically important light sources in the mid-infrared (IR) and far-IR wavelength ranges infringing on the near-IR and terahertz spectral regions respectively. However, the overall power conversion efficiency, so-called wallplug efficiency, of the best QC lasers, emitting around 5 microns, is ∼9% in CW operation and very unlikely to exceed 15%. In order to dramatically improve the wallplug efficiency of mid-IR lasers (i.e., to about 50%), intersubband QB (IQB) lasers have been proposed. The basic idea, the optimal design and the progress towards the fabrication of IQB lasers will be presented.

ISBN: 9781109047790Subjects--Topical Terms:

649834
Electrical engineering.
Subjects--Index Terms:

Confined emitters

Spectral gain measurements of quantum confined emitters, and design and fabrication of intersubband quantum box laser structures.
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245 1 0 $a Spectral gain measurements of quantum confined emitters, and design and fabrication of intersubband quantum box laser structures.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2008
300 $a 146 p.
500 $a Source: Dissertations Abstracts International, Volume: 70-11, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Botez, Dan;Mawst, Luke N.
502 $a Thesis (Ph.D.)--The University of Wisconsin - Madison, 2008.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a Semiconductor laser active regions are commonly characterized by photo- and electro-luminescence (PL, EL) and cavity length analysis. However quantitative spectral information is not readily extracted from PL and EL data and comparison of different active region materials can be difficult. More quantifiable spectral information is contained in the optical gain spectra. This work reports on spectral gain studies, using multi-segmented interband devices, of InGaAs quantum well and quantum dot active regions grown by metalorganic chemical vapor deposition (MOCVD). Using the fundamental connection between gain and spontaneous emission spectra, the spontaneous radiative current and spontaneous radiative efficiency is evaluated for these active regions. The spectral gain and spontaneous radiative efficiency measurements of 980 nm emitting InGaAs quantum well (QW) material provides a benchmark comparison to previous results obtained on highly-strained, 1200 nm emitting InGaAs QW material. These studies provide insight into carrier recombination and the role of the current injection efficiency in InGaAs QW lasers. The spectral gain of self-assembled MOCVD grown InGaAs quantum dots (QD) active regions are also investigated, allowing for comparison to InGaAs QW material. The second part of my talk will cover intersubband-transition QW and quantum-box (QB) lasers. Quantum cascade (QC) lasers have emerged as compact and technologically important light sources in the mid-infrared (IR) and far-IR wavelength ranges infringing on the near-IR and terahertz spectral regions respectively. However, the overall power conversion efficiency, so-called wallplug efficiency, of the best QC lasers, emitting around 5 microns, is ∼9% in CW operation and very unlikely to exceed 15%. In order to dramatically improve the wallplug efficiency of mid-IR lasers (i.e., to about 50%), intersubband QB (IQB) lasers have been proposed. The basic idea, the optimal design and the progress towards the fabrication of IQB lasers will be presented.
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650 4 $a Electrical engineering. $3 649834
650 4 $a Optics. $3 517925
650 4 $a Nuclear physics. $3 517741
653 $a Confined emitters
653 $a Quantum box lasers
653 $a Quantum dot lasers
653 $a Quantum well lasers
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710 2 $a The University of Wisconsin - Madison. $3 626640
773 0 $t Dissertations Abstracts International $g 70-11B.
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793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3348942