Patent ID: 8385377

Claim:
A semiconductor laser device comprising: a semiconductor laser element configured to emit a fundamental wave; a transducer configured to receive incident thereon the fundamental wave and convert a wavelength of the fundamental wave to emit wavelength converted light; a filter configured to selectively transmit wavelength range light having a desired wavelength range of the wavelength converted light; a sealing member, including a light-transmitting member, configured to enclose the semiconductor laser element, the light-transmitting member being configured to receive the wavelength range light transmitted through the filter and incident on the light-transmitting member, specularly reflect part of the wavelength range light, and substantially transmit the remaining part of the wavelength range light; and a photoreceptor configured to receive the specularly reflected light from the light-transmitting member; wherein: the fundamental wave emitted from the semiconductor laser element is partially converted by the transducer to the wavelength converted light, which is transmitted through the filter and reaches the light-transmitting member, which specularly reflects part of the wavelength range light transmitted through the filter as first reflected light and substantially transmits the remaining part of the wavelength range light, and the filter specularly reflects the first reflected light as second reflected light, which is received by the photoreceptor.