CPC G02B 5/32 (2013.01) [G02B 6/2931 (2013.01); G02F 1/292 (2013.01); G03H 1/26 (2013.01); G03H 1/2645 (2013.01); G03H 1/28 (2013.01); G03H 2001/0473 (2013.01); G03H 2001/266 (2013.01); G03H 2222/13 (2013.01); G03H 2222/14 (2013.01)] | 18 Claims |
1. A beam steering method comprising:
making first reference light, having a first characteristic, incident on a hologram recording medium on which signal light is holographically recorded, wherein the signal light comprises a first signal light group comprising a plurality of first signal light beams having first steering information and recorded using the first reference light and a second signal light group comprising a plurality of second signal light beams having second steering information, different from the first steering information and recorded using a second reference light, based on the first reference light incident on the hologram recording medium, outputting, to an external environment, the first signal light group comprising the plurality of first signal light beams, and determining a target region in the external environment within which an object exists using the output first signal light group; and
subsequent to the determining of the target region, making the second reference light, having a second characteristic different from the first characteristic, incident on the hologram recording medium, thereby outputting, to the target region, the second signal light group comprising the plurality of second signal light beams to obtain information about the object that exists in the target region.
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