1 November 2010 Ridge-width dependence of midinfrared interband cascade laser characteristics
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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.
© (2010) Society of Photo-Optical Instrumentation Engineers (SPIE)
William W. Bewley, William W. Bewley, Chadwick L. Canedy, Chadwick L. Canedy, Chul Soo Kim, Chul Soo Kim, Mijin Kim, Mijin Kim, J. Ryan Lindle, J. Ryan Lindle, Joshua Abell, Joshua Abell, Igor Vurgaftman, Igor Vurgaftman, Jerry R. Meyer, Jerry R. Meyer, } "Ridge-width dependence of midinfrared interband cascade laser characteristics," Optical Engineering 49(11), 111116 (1 November 2010). https://doi.org/10.1117/1.3498772 . Submission:
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