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  • Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference
  • Technical Digest (Optica Publishing Group, 2003),
  • paper QTuJ1

Observation of huge nonlinear absorption enhancement near exciton resonance in GaN

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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.

© 2003 Optical Society of America

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