	US 12,422,778 B2
	Optical scanning holography system
Tae Geun Kim, Seoul (KR)
Assigned to CUBIXEL CO., LTD, Seoul (KR)
Filed by CUBIXEL CO., LTD., Seoul (KR)
Filed on Jul. 3, 2023, as Appl. No. 18/217,626.
Application 18/217,626 is a division of application No. 17/272,669, granted, now 11,977,353, previously published as PCT/KR2019/010807, filed on Aug. 23, 2019.
Claims priority of application No. 10-2018-0104634 (KR), filed on Sep. 3, 2018; application No. 10-2018-0136475 (KR), filed on Nov. 8, 2018; and application No. 10-2019-0035836 (KR), filed on Mar. 28, 2019.
Prior Publication US 2023/0341814 A1, Oct. 26, 2023
Int. Cl. G03H 1/22 (2006.01); G02B 26/10 (2006.01); G02B 27/28 (2006.01); G03H 1/04 (2006.01)

CPC G03H 1/0443 (2013.01) [G02B 26/101 (2013.01); G02B 27/283 (2013.01); G02B 27/286 (2013.01); G03H 2001/0447 (2013.01); G03H 2001/0463 (2013.01); G03H 2222/31 (2013.01); G03H 2222/45 (2013.01); G03H 2223/20 (2013.01); G03H 2223/22 (2013.01); G03H 2223/24 (2013.01); G03H 2225/32 (2013.01); G03H 2226/02 (2013.01)]

4 Claims

1. A geometric phase in-line scanning holography system, comprising:

a polarizer configured to convert an input beam into a linearly polarized beam;

a collimator configured to receive the linearly polarized beam from the polarizer and expand the linearly polarized beam;

a single polarization-sensitive lens configured to simultaneously generate, from the expanded linearly polarized beam, a first spherical wave of right-handed circular polarization having a negative focal length located on a source side of the single polarization-sensitive lens, and a second spherical wave of left-handed circular polarization having a positive focal length located on an object side of the single polarization-sensitive lens;

wherein the negative focal length and the positive focal length are formed along a single optical path;

a scanning unit configured to scan an object by using an interference beam formed by superposition of the first spherical wave and the second spherical wave along the single optical path;

a light integrator configured to spatially integrate light reflected from the object scanned by the interference beam;

a first beam splitter configured to receive the spatially integrated light from the light integrator and to split the spatially integrated light into a first output beam and a second output beam;

a second beam splitter configured to split the first output beam into a 1a^thoutput beam and a 1b^thoutput beam;

a third beam splitter configured to split the second output beam into a 2a^thoutput beam and a 2b^thoutput beam;

first, second, third, and fourth polarizers respectively arranged to polarize the 1a^th, 1b^th, 2a^th, and 2b^thoutput beams, wherein polarization directions of the first to fourth polarizers are rotated 0°, 45°, 90°, and 135°, respectively, relative to one another; and

first, second, third, and fourth photodetectors configured to respectively detect the 1a^th, 1b^th, 2a^th, and 2b^thoutput beams passing through the first to fourth polarizers and generate corresponding detection signals,

wherein an electronic processor is configured to combine the detection signals to obtain a complex hologram of the object based on geometric-phase interference of the first spherical wave and the second spherical wave.