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 language | English |
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Pages (from-to) | 478-486 |
Number of pages | 9 |
Journal | IEEE Journal of Quantum Electronics |
Volume | 39 |
DOIs | |
Publication status | Published - 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