LIGHT SOURCE

摘要

To provide a light source capable of generating a fundamental wave of a desired wavelength from a spontaneous emission light and tuning the wavelength of the fundamental wave in a bandwidth of 1060 nm to 1200 nm in the order of 1 nm, a light source 100 includes a semiconductor laser 1, a first optical waveguide 2, a second optical waveguide 3 that absorbs a pumping light emitted from the first optical waveguide 2 and emits a spontaneous emission light of a wavelength longer than a wavelength of the pumping light, a third optical waveguide 4, and a wavelength selecting element 6 provided between the second optical waveguide 3 and the third optical waveguide 4, wherein a resonator k is formed between the semiconductor laser 1 side and an output side to outside sandwiching the wavelength selecting element 6. The laser light is output with a wavelength tuned in the order of 1 nm by controlling length of the second optical waveguide 3.