MULTIFOCAL SYSTEM WITH POLARIZATION-INDEPENDENT FOCUSING

WIPO Patent Application WO/2021/147131

A1

A multifocal system (900) has a polarization beam splitter (PBS) (910) to split an unpolarized light beam (905) into two orthogonally linearly-polarized (LP) light beams (911, 912). The two LP light beams (911, 912) are reflected by mirrors (951, 952) to travel in opposite directions and enter into a variable-focusing module (920) at two ends (921, 922) thereof, respectively. The module (920, 700) includes waveplates (720, 730) to convert the LP light beams into two circularly-polarized (CP) light beams at both ends of an optical assembly (724, 200). The optical assembly (724, 200) is formed with a stack of birefringent optical elements including at least one geometric phase lens and one polarization selector that may be electrically modulated to select the optical power in focusing the two CP light beams. Followed by the waveplates (720, 730) converting two focused CP light beams to two focused LP light beams (971, 972) and upon mirror reflection, the beams (971, 972) are finally recombined by the PBS (910) to form one focused light beam (906). Polarization-independent focusing is achieved by the multifocal system (900).

TAM MING WAI ALWIN (CN)
WANG XIAOHAN (CN)
ZHANG ZHUANYUN (CN)
ZHU XIULING (CN)
CHAN KIN LUNG KENNY (CN)

PCT/CN2020/076324

July 29, 2021

February 24, 2020

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HONG KONG APPLIED SCIENCE & TECH RESEARCH INST CO LTD (CN)

G02B27/14; G02B3/10

JP2011221395A	2011-11-04
JP2011221395A	2011-11-04
CN109100866A	2018-12-28
US20180284464A1	2018-10-04
US10379419B1	2019-08-13
US10120193B2	2018-11-06
CN108347597A	2018-07-31

BEIJING PAT SF INTELLECTUAL PROPERTY AGENCY CO., LTD (CN)

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