Abstract
Low-threshold semiconductor Raman lasers with a tapered waveguide structure with GaP core and AlxGa1-xP cladding layers have been operated in a quasi CW operation condition. It has been found that the first Stokes light output power nearly perfectly saturates when the pump power is increased, and this has been attributed to lasing of the second Stokes light. This effect will be useful for realising a low-noise light wave source.
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