David J. Hagan
Himansu S. Pattanaik
Eric W. Van Stryland
University of Central Florida, United States
Princeton University, United States
Nonlinear Optics, Semiconductors, Infrared Detectors, Semiconductor Lasers.
Photonics, Optics and Laser Technology
Quantum Electronics and Laser Science
Direct-gap semiconductors show enhanced two-photon absorption and nonlinear refraction for the extremely
non-degenerate case, i.e. for two light waves of very different wavelength, as compared to the degenerate
case. We have verified this through measurements of non-degenerate two-photon absorption and nonlinear
refraction in several direct-gap semiconductors. We have demonstrated application towards mid-infrared
detection and imaging, as well as 2-photon gain in the mid infrared. We also show how semiconductor
quantum wells may be employed to engineer even larger enhancements of these effects.