Time-bandwidth product of gain-switched In0.2Ga0.8As/GaAs microcavity lasers
- 4 September 1995
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 67 (10) , 1363-1365
- https://doi.org/10.1063/1.115534
Abstract
We present the temporal and spectral evolution of stimulated emission from In0.2Ga0.8As/GaAs microcavity laser samples at 20 K after femtosecond optical excitation. Both, linewidth and chirp become smaller when the cavity resonance is at shorter wavelengths within the gain spectrum of the quantum well: The linewidth is reduced from Δλ=0.41 nm at 923 nm, where the threshold is lowest, to Δλ=0.26 nm at 884 nm. Comparison with a phenomenological model yields linewidth enhancement factors α of 2 and 5 for emission wavelengths of 884 and 925 nm, respectively. A time‐bandwidth product of 0.68 is obtained at the shorter wavelength.Keywords
This publication has 0 references indexed in Scilit: