J. A. Gupta, X. Wu, G. C. Aers, Y. Li, L. Li, W. Huang, R. Q. Yang, “Low-threshold InAs-based interband cascade lasers with room-temperature emission at 6.3 μm” (Invited), talk 10939-33 at Novel In-Plane Semiconductor Lasers XVIII at Photonics West, San Francisco, CA, Feb.2-7, 2019.