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Proceedings Paper

Intersubband-transition-induced interband two-photon absorption by femtosecond optical excitation
Author(s): Arup Neogi; Haruhiko Yoshida; Teruo Mozume; Nikolai Georgiev; Tomoyuki Akiyama; Osamu Wada
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Paper Abstract

We report the near-infrared intersubband absorption characteristics in In (formula available in paper) heterostructures lattice matched in InP substrate. We have investigated for the first time the excitation power dependence of the intersubband transitions in Sb based quantum wells using a femtosecond optical parametric amplifier tuned over wavelength ranging from 1.8 micrometers - 2.4 micrometers . The bandgap of the InGaAs material system in the regime of 1.0 eV facilitates nonlinear interband optical absorption effects in the presence of strong near-infrared intersubband resonant optical excitation. We have observed a novel nonlinear optical phenomenon,- an intersubband transition induced interband absorption due to the two- photon interband excitation after the onset of the intersubband absorption saturation. The excitation wavelength-dependence of the absorption saturation characteristics has also been studied. The absorption saturation measurements have been performed in quantum wells with various well widths.

Paper Details

Date Published: 28 March 2000
PDF: 7 pages
Proc. SPIE 3940, Ultrafast Phenomena in Semiconductors IV, (28 March 2000); doi: 10.1117/12.381470
Show Author Affiliations
Arup Neogi, Femtosecond Technology Research Association and New Energy and Industrial Research Develop (United States)
Haruhiko Yoshida, Femtosecond Technology Research Association (Japan)
Teruo Mozume, Femtosecond Technology Research Association (Japan)
Nikolai Georgiev, Femtosecond Technology Research Association and New Energy and Industrial Research Develop (Japan)
Tomoyuki Akiyama, Femtosecond Technology Research Association (Japan)
Osamu Wada, Femtosecond Technology Research Association (Japan)

Published in SPIE Proceedings Vol. 3940:
Ultrafast Phenomena in Semiconductors IV
Kong-Thon F. Tsen; Jin-Joo Song, Editor(s)

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