12 May 2016 Distributed-feedback interband cascade lasers with reduced contact duty cycles
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We report the single-mode operation of mid-infrared distributed-feedback (DFB) interband cascade lasers (ICLs) with contacts that cover only a fraction of the top surface of the laser ridge. This reduces the optical loss from the metal for the GaSb-relevant device configuration in which the grating is fabricated in the top layer of the DFB laser. Continuous wave (cw) room-temperature operation in a single spectral mode is observed for contact duty cycles as small as 14% when the width of the contact is fixed at 10 μm. The reduced contact duty cycle results in a factor of 2 decrease in the threshold current. The highest slope efficiency is observed for a contact duty cycle of 33%, for which the cw single-mode output power is as high as 6.8 mW.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
C. D. Merritt, C. D. Merritt, W. W. Bewley, W. W. Bewley, C. L. Canedy, C. L. Canedy, C. S. Kim, C. S. Kim, M. Kim, M. Kim, M. V. Warren, M. V. Warren, I. Vurgaftman, I. Vurgaftman, J. R. Meyer, J. R. Meyer, "Distributed-feedback interband cascade lasers with reduced contact duty cycles", Proc. SPIE 9855, Next-Generation Spectroscopic Technologies IX, 98550C (12 May 2016); doi: 10.1117/12.2223178; https://doi.org/10.1117/12.2223178

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