Special Section on Quantum and Interband Cascade Lasers

Ridge-width dependence of midinfrared interband cascade laser characteristics

[+] Author Affiliations
William Bewley, Chadwick Canedy, Chul Soo Kim, Mijin Kim, J. Ryan Lindle, Joshua Abell, Igor Vurgaftman, Jerry Meyer

Naval Research Laboratory, Code 5613, 4555 Overlook Avenue Southwest, Washington D.C. 20375

Opt. Eng. 49(11), 111116 (November 22, 2010). doi:10.1117/1.3498772
History: Received March 31, 2010; Revised July 07, 2010; Accepted July 09, 2010; Published November 22, 2010; Online November 22, 2010
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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 λ = 3.5-μm to a new record temperature of 345 K for the 3 to 4-μm spectral range.

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© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

William Bewley ; Chadwick Canedy ; Chul Soo Kim ; Mijin Kim ; J. Ryan Lindle, et al.
"Ridge-width dependence of midinfrared interband cascade laser characteristics", Opt. Eng. 49(11), 111116 (November 22, 2010). ; http://dx.doi.org/10.1117/1.3498772


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