LIGHT SOURCE DEVICE AND WAVELENGTH CONVERSION METHOD

摘要

A light source (10) emits first incidence light to a first polarization-reversed structure (22). The first polarization-reversed structure (22) converts the wavelength of the first incidence light and emits a higher harmonic wave. A fiber coupler (30) branches the higher harmonic wave emitted from the first polarization-reversed structure (22) into the output light from the light source device and feedback light. The feedback light is incident to a second polarization-reversed structure (42). The second polarization-reversed structure (42) converts the wavelength of the feedback light and emits a second incidence light. The second incidence light has the same wavelength as the first incidence light. The second incidence light is incident to a first wavelength conversion unit.