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AMO/QO PHYSICS SEMINAR


"Broadly-tunable Room-temperature THz Quantum Cascade Laser Sources"


Dr. Mikhail Belkin
Department of Electrical and Computer Engineering
University of Texas, Austin


ABSTRACT 

I will discuss our progress towards developing the first room-temperature electrically-pumped THz semiconductor laser sources that are similar in appearance and operating simplicity 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 range with up to 0.5 mW/W2 mid-infrared-to-terahertz conversion efficiency at selected THz frequencies at room temperature. We also demonstrate their wide spectral tunability in nearly entire 1-5 THz spectral range.



Friday, April 26, 2013
IQSE 578, 2:00 p.m.
Mitchell Physics Building


Institute for Quantum Science and Engineering
Texas A&M University