Stefan Hausser, Christoph S. Harder, et al.
Applied Physics Letters
Paper
Threshold reduction through photon recycling in semiconductor lasers
Abstract
The threshold pump power of an AlGaAs-GaAs ridge quantum well laser diode has been reduced by 42% by recycling the spontaneous emission. An integrated photodiode absorbs the spontaneous radiation emitted by the laser diode and converts it back into electrical power. The recycling of this power results in a reduction of the electrical power required to reach the lasing threshold.
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