Tuesday, June 28, 2011, 2:00 pm — Large Conference Room, Bldg 703
Quantum cascade lasers (QCLs) are semiconductor lasers based on intersubband transitions, resonant tunneling and phonon scattering, emitting Mid- to far-IR light. In order to understand the ultrafast carrier dynamics in QCLs, pump-probe technique has been extensively employed to investigate the electron transport dynamics and coupled light-matter interactions. Moreover, people have observed giant optical nonlinearity in quantum well structures and QCLs by taking advantage of the large dipole-matrix elements of intersubband transition.
The talk will focus on studying the carrier dynamics of ultrastrong-coupling designed QCLs using degenerate Mid-IR pump-probe technique. Second harmonic generated pulses were also obtained from the QCLs pumped by femtosecond Mid-IR pulses through front facet illumination. Furthermore, other experiments related to Mid-IR such as supercontinuum generation in chalcogenide fiber, photoluminescence of type-II detector will be briefly discussed.
Hosted by: Dr. G. Larry Carr
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