Semiconductor light emitter

A semiconductor light emitter comprising:

• a substrate;
• a semiconductor multilayer structure including a light emission unit that emits light in an oblique direction with respect to the substrate in an emission region in a longitudinal direction and a lateral direction orthogonal to the longitudinal direction, wherein the semiconductor multilayer structure extends in the longitudinal direction;
• and
• a shaping optical system that shapes a luminous flux emitted from the light emission unit,
• wherein a lens closest to the light emission unit in the shaping optical system is a cylindrical lens having positive power in the lateral direction,
• a front major plane of the cylindrical lens is parallel to the light emission unit and a generatrix direction of the cylindrical lens is parallel to the longitudinal direction, and
• the following conditional equation (1) is satisfied in a case where
• a distance from the light emission unit to a light incident surface of the cylindrical lens is D,
• a distance from the light incident surface to the front major plane of the cylindrical lens is HA, and
• a focal length of the cylindrical lens is f,
• D<f−HA (1).