Patent ID: 7949021

Claim:
A light source apparatus, comprising: a seed light source outputting pulse light; a first optical amplifier inputting the pulse light outputted from said seed light source and outputting the amplified pulse light, said first optical amplifier including: an optical amplification waveguide with an optical amplification function obtained by doping its optical waveguide region with an optical amplification element for amplifying light; and pumping light supply means for continuously supplying pumping light for pumping the amplification element to said optical amplification waveguide; and a control section for controlling said seed light source so that the output cycle of the pulse light is longer than the fluorescence time constant of the amplification element and so that the ratio of a peak value of the pulse light from said seed light source with respect to an optical power outputted from said seed light source in an inter-pulse time region is 1000 times or more.