Patent ID: 8502695

Claim:
A light emitting device, comprising: a semiconductor laser element for emitting laser light, which is coherent laser light; an optical conversion member for converting the coherent laser light which is emitted from the semiconductor laser element into incoherent light, and for emitting the incoherent light; and a safety device for preventing the coherent laser light from exiting to an outside of the light emitting device, wherein the safety device includes a photo sensor for detecting intensity of at least one of the incoherent light and the coherent laser light exiting to the outside, the photo sensor includes, a first optical filter for blocking one of light that has substantially the same wavelength as a wavelength of the laser light and the incoherent light and for transmitting at least a portion of other of the light that has substantially the same wavelength as the wavelength of the laser light and the incoherent light, and a light receiving element for detecting intensity of light transmitted through the first optical filter, and the laser light to be converted by the optical conversion member is a single-wavelength laser light.