PROBLEM TO BE SOLVED: To provide a planar emitting type semiconductor laser, which sets a beam diameter into one approximating type circle on a projection surface, can deepen the depth of a focal point, can lessen the restriction on the accuracy which is required to an alignment, and can stably maintain the plane of polarization, while a transverse mode is stabilized, without exerting special effects on the light output characteristics, which are provided by the planar emitting type semiconductor laser which can reduce the fluctuations of the beam diameter, which is projected on the surface of a photosensitive material by the eccentricity of a photosensitive material drum. ;SOLUTION: When a vertical resonator planar emitting type semiconductor laser element is constituted into such a structure that an active layer 3 is held between upper and lower semiconductor multilayer reflective films 2 and 5 on a semiconductor substrate 1, and light is emitted in the vertical direction to the substrate, at least either of the films 2 and 5 is formed so as to make the length in one direction within the surface of the substrate longer than the lengths in the other directions within the surface of the substrate, and the intensity pattern of a luminous beam is formed so as to have a directional property.;COPYRIGHT: (C)1998,JPO
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