Semiconductor light source apparatus and lighting unit

A semiconductor light source apparatus, comprising:

• a substrate having a mounting surface;
• at least one phosphor layer having a refraction index n2 disposed on the mounting surface of the substrate via an adhesive material, and the at least one phosphor layer having at least one of, a glass phosphor and a phosphor ceramic, which includes substantially no resin component;
• a semiconductor light source configured to emit a blue laser light having a field vector, an optical axis, a light-emitting area and an incident angle with respect to the at least one phosphor layer, the semiconductor light source located adjacent to the at least one phosphor layer so that the optical axis of the semiconductor light source intersects with the mounting surface of the substrate at an angle between 0 degrees and 90 degrees, the light-emitting area of the semiconductor light source being located on the at least one phosphor layer to wavelength-convert the blue laser light emitted from the semiconductor light source by the at least one phosphor layer, and the semiconductor light source being configured such that the blue laser light emitted from the semiconductor light source travelling along the optical axis changes direction toward the at least one phosphor layer after being reflected from at least one of the substrate and the adhesive material, wherein the field vector of the blue laser light is substantially parallel with an imaginary plane which connects an incident direction of the blue laser light directed toward the at least one phosphor layer to a normal line of an incident surface on the at least one phosphor layer.