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1 November 2010 Ridge-width dependence of midinfrared interband cascade laser characteristics
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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 = 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, Chadwick L. Canedy, Chul Soo Kim, Mijin Kim, J. Ryan Lindle, Joshua Abell, Igor Vurgaftman, and Jerry R. Meyer "Ridge-width dependence of midinfrared interband cascade laser characteristics," Optical Engineering 49(11), 111116 (1 November 2010).
Published: 1 November 2010

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