Patent ID: 7317677

Claim:
An semiconductor laser light source apparatus comprising: a semiconductor laser oscillator for emitting a laser beam; and a lens for transmitting the laser beam emitted by the semiconductor laser oscillator, wherein the lens comprises a light transparent material in which microparticles are dispersed into a plastic resin and have sizes of the transmitting laser beam wavelength or below, wherein sizes and densities of the microparticles for dispersing into the plastic resin are regulated so that a temperature coefficient of a refractive index of the light transparent material has a predefined value, a focal point of the lens is shifted by a first factor which is heat deformation and refractive index variation caused by the lens temperature variation and a second factor which is an oscillating wavelength change of the semiconductor laser oscillator caused by a temperature variation thereof, and the temperature coefficient is regulated so that the focal point shift caused by the first factor is in an opposite direction to the focal point shift caused by the second factor.