Influence of scattering and two-photon absorption on the optical loss in GaAs/Al2O3 nonlinear waveguides measured using femtosecond pulses

S Venugopal Rao, K Moutzouris, Majid Ebrahimzadeh, A De Rossi, M Calligaro, V Ortiz, G Ginitz, V Berger

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

The influence of scattering and two-photon absorption on the optical loss in GaAs-Al2O3 semiconductor nonlinear waveguides has been studied using femtosecond pulses. By deploying a scattering technique, loss coefficients were evaluated over an extended wavelength range of 1.3-2.1 mum in the near-infrared. A systematic study involving intensity and wavelength dependence of the loss revealed the presence of two-photon absorption for wavelengths below 1.6 mum. A simple nonlinear transmission study enabled the separation of the two-photon absorption coefficient from scattering and linear absorption. The calculated two-photon absorption coefficients were similar to9-20 cm/GW.

Original languageEnglish
Pages (from-to)478-486
Number of pages9
JournalIEEE Journal of Quantum Electronics
Volume39
DOIs
Publication statusPublished - Mar 2003

Keywords

  • nonlinear frequency conversion
  • optical losses
  • scattering technique
  • semiconductor waveguides
  • two-photon absorption
  • GUIDE LOSS-MEASUREMENT
  • PLANAR WAVE-GUIDES
  • FABRY-PEROT METHOD
  • PROPAGATION LOSS
  • BAND-GAP
  • REFRACTIVE-INDEX
  • PARAMETRIC FLUORESCENCE
  • 2-PHOTON ABSORPTION
  • GAAS
  • ALGAAS

Fingerprint

Dive into the research topics of 'Influence of scattering and two-photon absorption on the optical loss in GaAs/Al2O3 nonlinear waveguides measured using femtosecond pulses'. Together they form a unique fingerprint.

Cite this