Observation of huge nonlinear absorption enhancement near exciton resonance in GaN
Journal
Optics InfoBase Conference Papers
ISBN
1557527490
Date Issued
2003-01-01
Author(s)
Lin, Kung Hsuan
Chern, Gia Wei
Huang, Yin Chieh
Keller, Stacia
Mishra, Umesh
DenBaars, Steven P.
Abstract
Huge nonlinear-absorption enhancement was observed in GaN system at the excitonic transition wavelength. This excitonic enhancement is attributed to four-wave-mixing type nonlinear processes. The peak nonlinear coefficient is at least 3000 cm/GW corresponding to an enhancement factor of >200. The dephasing time of the exciton was also observed to be 60-160 fs in GaN thin film at room temperature.
Type
conference paper