Shorter wavelength light generating apparatus in which coherent light is converted into shorter wavelength light

摘要

A shorter wavelength light generating apparatus consists of a semiconductor laser for initially radiating various modes of coherent light including a required mode of coherent light, a reflection type of diffraction grating for diffracting and reflecting the various modes of coherent light to selectively feed back the required mode of coherent light to the semiconductor laser which is induced by the coherent light fed back to dominantly radiate the required mode of coherent light, and an optical wavelength type of wavelength converting device for converting a part of the required mode of coherent light radiated from the semiconductor laser into shorter wavelength light. The required mode of coherent light not converted is radiated to the diffraction grating. Accordingly, even though the various modes of coherent light are initially radiated from the semiconductor laser, the required mode of coherent light is dominantly radiated from the semiconductor laser after a short time. Therefore, the shorter wavelength light is stably output while stabilizing the wavelength of the shorter wavelength light.