Above- and below-band femtosecond nonlinearities in active AlGaAs waveguides
- 7 December 1992
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 61 (23), 2767-2769
- https://doi.org/10.1063/1.108084
Abstract
Femtosecond optical pulses were used to study the gain and refractive index dynamics in a bulk AlGaAs diode laser. Experiments were performed at wavelengths above and below the band gap of the diode-laser active region. The above-band gain dynamics exhibit an ultrafast transient that has not been seen before in AlGaAs devices. We attribute this dynamic to spectral-hole burning and a delay in carrier heating. The below-band refractive index measurements demonstrate that carrier heating by free-carrier absorption is important and that there is a delay in the onset of this heating of approximately 120 fs.Keywords
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