A light source apparatus equipped with a GaN type semiconductor laser, wherein
deformation of the shape of the light spot due to fluctuations in the drive current
of the light emitting element is prevented, is provided. A light source apparatus
equipped with a GaN type semiconductor laser is provided with a slit panel or other
spatial filter for eliminating stray light, which amounts to 20% or less of the
total output occurring when the GaN type semiconductor laser is driven at maximum
output, from the light emitted from the GaN type semiconductor laser.
