skip to main content

Title: Features of simultaneous ground- and excited-state lasing in quantum dot lasers

The lasing spectra and light-current (L-I) characteristics of an InAs/InGaAs quantum dot laser emitting in the simultaneous lasing mode at the ground- and excited-state optical transitions are studied. Lasing and spontaneous emission spectra are compared. It is shown that ground-state quenching of lasing is observed even in the absence of active region self-heating or an increase in homogeneous broadening with growth in the current density. It is found that the intensities of both lasing and spontaneous emission at the ground-state transition begin to decrease at a pump intensity that significantly exceeds the two-level lasing threshold. It is also found that different groups of quantum dots are involved in ground- and excited-state lasing.
Authors:
; ;  [1] ;  [2] ; ; ;  [1]
  1. Russian Academy of Sciences, St. Petersburg Academic University-Nanotechnology Research and Education Center (Russian Federation)
  2. Innolume GmbH (Germany)
Publication Date:
OSTI Identifier:
22039033
Resource Type:
Journal Article
Resource Relation:
Journal Name: Semiconductors; Journal Volume: 46; Journal Issue: 2; Other Information: Copyright (c) 2012 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CURRENT DENSITY; EMISSION; EMISSION SPECTRA; EXCITED STATES; GALLIUM ARSENIDES; GROUND STATES; INDIUM ARSENIDES; LASERS; QUANTUM DOTS; QUENCHING