US 12,306,300 B2
System for observing object by using hologram optical element
Dae Han Seo, Daejeon (KR); Bu Gon Shin, Daejeon (KR); Chang Yoon Lim, Daejeon (KR); Soyoung Choo, Daejeon (KR); and Hyunjoo Son, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 18/008,751
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Oct. 19, 2021, PCT No. PCT/KR2021/014600
§ 371(c)(1), (2) Date Dec. 7, 2022,
PCT Pub. No. WO2022/086130, PCT Pub. Date Apr. 28, 2022.
Claims priority of application No. 10-2020-0135094 (KR), filed on Oct. 19, 2020; and application No. 10-2021-0139197 (KR), filed on Oct. 19, 2021.
Prior Publication US 2023/0213650 A1, Jul. 6, 2023
Int. Cl. G01S 17/04 (2020.01); G02B 5/32 (2006.01)
CPC G01S 17/04 (2020.01) [G02B 5/32 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A system for observing an object, the system comprising:
an infrared (IR) light source for emitting infrared light;
a hologram optical element (HOE) including an optical element film, wherein the optical element film is for reflecting and diffracting the emitted infrared light, wherein infrared light of a specific wavelength from among the emitted infrared light is reflected towards the object; and
an IR light detector for detecting the infrared light of a specific wavelength reflected from the object,
wherein the optical element film comprises: a base layer, an HOE record layer disposed on the base layer, the HOE record layer is for reflecting and diffracting the infrared light of a specific wavelength from among the emitted infrared light incident on the HOE record layer through the base layer, and a protection layer disposed on the HOE record layer.