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Browse Journals & Magazines > Applied Physics Letters ...> Volume:82 Issue:26 Help

Two-photon absorption and multiphoton-induced photoluminescence of bulk GaN excited below the middle of the band gap

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7 Author(s)
Toda, Y. ; Department of Applied Physics, Hokkaido University, Kita 13 Nishi 8 Kita-ku, Sapporo 060-8628, Japanand PRESTO, Japan Science and Technology Corporation, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan ; Matsubara, T. ; Morita, R. ; Yamashita, M.
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Optical nonlinearity in the yellow luminescence (YL) band of GaN was investigated using thick bulk samples. Transient pump–probe measurements revealed strong transmission changes due to two-photon absorption (TPA) even at the middle of the YL band. The TPA coefficient evaluated reaches ∼5 cm/GW at about 1.3 eV, which was as large as the mid-gap resonance. The TPA spectrum clearly showed that the observed large nonlinearity originated from the YL band. On the basis of efficient TPA in the YL band, relaxation processes in the multiphoton-induced photoluminescence excitation spectrum were also investigated. © 2003 American Institute of Physics.

Published in:
Applied Physics Letters  (Volume:82 ,  Issue: 26 )

Date of Publication: Jun 2003

Page(s):
4714 - 4716
ISSN :
0003-6951
Digital Object Identifier :
10.1063/1.1587260
Date of Current Version :
18 June 2009
Issue Date :
Jun 2003

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