期刊
OPTICS LETTERS
卷 40, 期 23, 页码 5459-5462出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.40.005459
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- Air Force Office of Scientific Research (AFOSR) [BRI FA9550-14-1-0062]
We utilize an asynchronous optical sampling technique to study the gain dynamics of vertical-external-cavity-surface-emitting lasers (VECSELs) under mode-locked operation. This allows for an in situ characterization of the gain depletion and recovery over nanoseconds with femtosecond-scale resolution. Our method allows for a more direct study of intracavity gain dynamics than traditional pump/probe measurements. We observe a rapid depletion of the gain on the timescale of the intracavity pulse. Afterward, a rapid recovery over a few picoseconds due to intraband scattering and carrier heating takes place, followed by a long recovery attributed to the continuous supply of carriers by the pump laser. (C) 2015 Optical Society of America
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