Illumination apparatus, hologram device, and vehicle control method

An illumination apparatus that illuminates an illumination zone having a first direction and a second direction crossing the first direction comprising:

• a light source to emit a plurality of coherent light beams having the same wavelength ranges;
• and
• a diffraction optical device to diffract the coherent light beam incident from the light source so that a width of the illumination zone in the second direction gradually becomes wider along the first direction of the illumination zone from a nearer side to the diffraction optical device,
• wherein the diffraction optical device comprises:
• a plurality of diffraction zones provided corresponding to the plurality of coherent light beams, respectively, the diffraction zones diffracting the corresponding coherent light beams to illuminate the illumination zone;
• and
• a light source controller.