I will discuss our progress towards developing the first room-temperature electrically-pumped THz semiconductor laser sources that are similar in appearance, operating simplicity, and mass-producibility potential to diode lasers. Our devices are designed as dual-wavelength mid-infrared quantum cascade lasers with active regions engineered to have giant optical nonlinearity associated with intersubband transitions, in addition to the laser gain. THz radiation is produced via intra-cavity difference-frequency generation. Non-collinear phase-matching scheme is used to effectively extract THz radiation along the whole length of the laser waveguide. The latest designs provide over 100μW of directional terahertz emission with up to 0.5 mW/W2 mid-infrared-to-terahertz conversion efficiency at selected THz frequencies at room temperature. We also demonstrate external cavity devices with tunable THz output in nearly entire 1-5 THz spectral range.
Mikhail Belkin received BS degrees in Physics and Mathematics from Moscow Institute of Physics and Technology in 1998 and PhD in Physics in from the University of California at Berkeley in 2004. In 2004-2008 he did his postdoctoral work in Prof. Federico Capasso group in the School of Engineering and Applied Sciences. In Fall 2008, he joined the faculty of the Electrical and Computer Engineering Department of the University of Texas at Austin as an Assistant Professor.
His current research interests include nonlinear optical phenomena in quantum cascade lasers and other devices based on intersubband transitions, sub-wavelength resolution microscopy in mid- and far-infrared, THz radiation sources, optical metamaterials, and plasmonic devices.
Dr. Belkin’s recent awards include the NSF CAREER Award (2012), the DARPA Young Faculty Award (2012), the Norman Hackerman Advanced Research Program Award for Early Career Investigators from the state of Texas (2012), and the AFOSR Young Investigator Program Award (2009). He has authored or co-authored over 100 journal and conference papers.