US 12,468,257 B2
Method and apparatus for holographic recording
Seung Hyun Lee, Namyangju-si (KR); Lee Hwan Hwang, Incheon (KR); Soon Chul Kwon, Seoul (KR); Jungho Kim, Uijeongbu-si (KR); and Philippe Gentet, Seoul (KR)
Assigned to KWANGWOON UNIVERSITY INDUSTRY-ACADEMIC COLLABORATION FOUNDATION, Seoul (KR)
Filed by KWANGWOON UNIVERSITY INDUSTRY-ACADEMIC COLLABORATION FOUNDATION, Seoul (KR)
Filed on Dec. 7, 2022, as Appl. No. 18/062,965.
Claims priority of application No. 10-2022-0165766 (KR), filed on Dec. 1, 2022.
Prior Publication US 2024/0184246 A1, Jun. 6, 2024
Int. Cl. G03H 1/22 (2006.01)
CPC G03H 1/2294 (2013.01) 8 Claims
OG exemplary drawing
 
1. A method of hologram recording, in which holograms are recorded in a method of tiling an entire recording surface of a holographic recording medium by interfering with an object beam and a reference beam for each divided hogel on the holographic recording medium divided in units of hogels and recording the holograms using holographic printing technology,
analyzing, by a control computer, deviations in diffraction efficiency for each hogel according to a recording angle for each hogel when holograms are recorded on the holographic recording medium for each hogel, wherein the recording angle refers to a crossing angle formed by the object beam and the reference beam when the holograms are recorded by interference of the object beam and the reference beam on the holographic recording medium;
pre-compensating, by the control computer, the deviations in diffraction efficiency by varying an intensity of the object beam for each hogel according to the deviations in diffraction efficiency; and
recording, by an object beam optical unit, holograms by varying the intensity of the object beam for each hogel in accordance with the pre-compensated intensity and allowing the varied object beam to be incident on the holographic recording medium.