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Optical Engineering

Ridge-width dependence of midinfrared interband cascade laser characteristics
Author(s): William W. Bewley; Chadwick L. Canedy; Chul Soo Kim; Mijin Kim; J. Ryan Lindle; Joshua Abell; Igor Vurgaftman; Jerry R. Meyer
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Paper Abstract

We report an experimental study of how the light-current characteristics and lateral mode properties of interband cascade lasers depend on ridge width. Narrower ridges provide greater heat dissipation due to lateral flow, along with operation in a single lateral mode. However,sidewall imperfections increase the cw threshold current density somewhat, from Jth = 582 A/cm2 at 300 K for an 11-µm-wide ridge to 713 A/cm2 and 1.07 kA/cm2 for 5- and 3-µm-wide ridges, respectively. The narrowest ridges similarly display a degradation of the slope efficiency. A 13-µm- wide ridge produced 45 mW per facet of cw output power and maximum wall-plug efficiency of 3.5% per facet at T = 20°C. A 5-µm-wide ridge with 3-mm cavity length and no facet coatings operated cw at = 3.5-µm to a new record temperature of 345 K for the 3 to 4-µm spectral range.

Paper Details

Date Published: 1 November 2010
PDF: 5 pages
Opt. Eng. 49(11) 111116 doi: 10.1117/1.3498772
Published in: Optical Engineering Volume 49, Issue 11
Show Author Affiliations
William W. Bewley, U.S. Naval Research Lab. (United States)
Chadwick L. Canedy, U.S. Naval Research Lab. (United States)
Chul Soo Kim, U.S. Naval Research Lab. (United States)
Mijin Kim, U.S. Naval Research Lab. (United States)
J. Ryan Lindle, U.S. Naval Research Lab. (United States)
Joshua Abell, U.S. Naval Research Lab. (United States)
Igor Vurgaftman, U.S. Naval Research Lab. (United States)
Jerry R. Meyer, U.S. Naval Research Lab. (United States)


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