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Opt Express. 2010 Sep 27;18(20):21330-41. doi: 10.1364/OE.18.021330.

Gain bandwidth characterization of surface-emitting quantum well laser gain structures for femtosecond operation.

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  • 1School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UK.


We present a method to experimentally characterize the gain filter and calculate a corresponding parabolic gain bandwidth of lasers that are described by "class A" dynamics by solving the master equation of spectral condensation for Gaussian spectra. We experimentally determine the gain filter, with an equivalent parabolic gain bandwidth of up to 51 nm, for broad-band InGaAs/GaAs quantum well gain surface-emitting semiconductor laser structures capable of producing pulses down to 60 fs width when mode-locked with an optical Stark saturable absorber mirror.

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