Patent ID: 7822094

Claim:
A semiconductor laser element comprising a multi-layered reflection film formed on at least one facet of a resonator, wherein a phase difference between emitted laser light and reflected light from the multi-layered reflection film ranges from (1−0.45)·π to (1+0.45)·π at an emission facet, wherein an optical path length of each layer of second and subsequent layers except a last layer is determined by λ/4−r·n 1 ·d 1 , where λ is an oscillation wavelength, r is a correction factor of 0.5 to 2.5, and n 1 and d 1 are a refractive index and a thickness of the first layer adjacent to said semiconductor, respectively, and wherein a low refractive index layer and a high refractive index layer are alternately stacked starting from the first layer adjacent to said semiconductor.