Abstract
Intersubband systems exhibit nonlinearities that can be hundreds of times larger than that of conventional materials. This has made them attractive candidates for nonlinear frequency conversion and other applications. Early work on intersubband nonlinearities focused on GaAs/Al-GaAs quantum wells Because of the small conduction band offset of this material system, it is only suitable to resonantly enhance nonlinear interactions of 5 urn wavelength or longer. Thus most studies of the nonlinear optical properties of intersubband transitions (ISBT) have used CO2 lasers.
© 2001 Optical Society of America
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