US 11,886,022 B2
Beam expander and beam expansion method
Aleksander V. Morozov, Moscow (RU); Sergey E. Dubynin, Moscow (RU); German B. Dubinin, Moscow (RU); Chilsung Choi, Suwon-si (KR); Hongseok Lee, Seoul (KR); and Hoon Song, Yongin-si (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed on Nov. 5, 2021, as Appl. No. 17/520,251.
Claims priority of application No. 2020136544 (RU), filed on Nov. 6, 2020; and application No. 10-2021-0061636 (KR), filed on May 12, 2021.
Prior Publication US 2022/0146764 A1, May 12, 2022
Int. Cl. G02B 6/42 (2006.01); G02B 6/34 (2006.01); G02B 6/13 (2006.01)
CPC G02B 6/4214 (2013.01) [G02B 6/13 (2013.01); G02B 6/34 (2013.01); G02B 6/4206 (2013.01); G02B 6/4207 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A beam expander comprising:
a first optical element;
a second optical element;
a composite waveguide including a plurality of waveguide elements each having a form of a substrate; and
a dichroic coating provided between the plurality of waveguide elements,
wherein the first optical element is configured to input a collimated incident beam from outside the beam expander into the composite waveguide, and the second optical element is configured to output, from the composite waveguide, the collimated incident beam, input to the composite waveguide,
wherein the collimated incident beam input into the composite waveguide is divided into a plurality of wavefronts by the dichroic coating, and the plurality of wavefronts are mixed by total internal reflection in the composite waveguide.