Beam deflection apparatus and holographic display apparatus including the same

A beam deflection apparatus comprising:

• a first beam deflector comprising a first region that deflects light of a first wavelength in a first direction and a second region that deflects light of a second wavelength in the first direction;
• and
• a second beam deflector comprising a third region that deflects the light of the first wavelength in a second direction and a fourth region that deflects the light of the second wavelength in the second direction, the second direction being perpendicular to the first direction,
• wherein the first beam deflector comprises a plurality of first drive electrodes and a plurality of second drive electrodes in the first region and the second region, respectively, and
• wherein a ratio of a spatial period of a signal applied to the plurality of first drive electrodes to the first wavelength is the same as a ratio of a spatial period of a signal applied to the plurality of second drive electrodes to the second wavelength.