MIOMD-XI Speakers    
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1.  Dr. Igor Vurgaftman, Naval Research Labs, USA
Invited Talk: Interband Cascade Lasers: Physical Principles and Operating Characteristics
Speaker Biography: Igor Vurgaftman received the B. S. degree summa cum laude in Computer Engineering from Boston University in 1991, and the M. S. and Ph. D. degrees in Electrical Engineering from the University of Michigan in 1993 and 1995, respectively. Since 1995, Dr. Vurgaftman has been with the Optical Sciences Division of the Naval Research Laboratory, Washington, DC, where he has investigated mid-infrared lasers based on interband and intersubband transitions, methods of maintaining optical coherence in large-area semiconductor lasers, type-II superlattice photodetectors, coherent sources of surface plasmons, and spintronic optical and electronic devices, among other topics. He is the author of more than 220 refereed articles in technical journals, numerous contributed and invited talks at professional conferences, as well as 16 patents. Dr. Vurgaftman is a Fellow of the Optical Society of America and American Physical Society.

Summary: The interband cascade laser (ICL) is an extremely promising midwave-infrared (mid-IR) coherent semiconductor source, which for the entire 3-6 μm spectral range has demonstrated room-temperature threshold power densities more than an order of magnitude lower than the best available results for quantum cascade lasers (QCLs). The ICL operation differs from both conventional diode lasers and QCLs, in that with the proper design a significant fraction of the carriers needed for lasing originate at a semimetallic interface located in each stage of the ICL structure. If an electron injector is employed to reduce the average electric field over the stage and inject electrons into the active region, it must be heavily n-doped since most of the electrons originating at the semimetallic interface populate states in the injector. While almost all of the demonstrated ICLs have employed type-II InAs/GaInSb active regions, the ICL concept can be extended straightforwardly to conventional type-I quantum wells as well as, possibly, other material systems. The presentation will review the rich physics of the ICL operation and deduce the main design principles from the existing physical constraints.
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