US 12,306,585 B2
Methods for fabricating optical waveguides
Jonathan David Waldern, Diablo, CA (US); Milan Momcilo Popovich, Leicester (GB); and Alastair John Grant, San Jose, CA (US)
Assigned to DigiLens Inc., Sunnyvale, CA (US)
Filed by DigiLens Inc., Sunnyvale, CA (US)
Filed on May 3, 2023, as Appl. No. 18/311,844.
Application 18/311,844 is a continuation of application No. 17/107,442, filed on Nov. 30, 2020, abandoned.
Application 17/107,442 is a continuation of application No. 16/242,966, filed on Jan. 8, 2019, abandoned.
Claims priority of provisional application 62/614,932, filed on Jan. 8, 2018.
Prior Publication US 2023/0359146 A1, Nov. 9, 2023
Int. Cl. G03H 1/20 (2006.01); G02B 6/00 (2006.01); G02B 27/00 (2006.01); G02B 27/01 (2006.01); G03H 1/02 (2006.01); G03H 1/04 (2006.01)
CPC G03H 1/20 (2013.01) [G02B 6/00 (2013.01); G02B 27/0081 (2013.01); G02B 27/0172 (2013.01); G03H 1/0248 (2013.01); G03H 1/0408 (2013.01); G02B 27/0093 (2013.01); G03H 2223/16 (2013.01); G03H 2260/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for recording holograms, the method comprising:
providing a waveguide cell comprising a layer of polymer dispersed liquid crystal mixture sandwiched between two substrates;
providing a master grating comprising a chirped grating;
providing a focusing element;
emitting at least one recording beam toward the master grating, wherein upon interaction with the master grating, a portion of the at least one recording beam is diffracted towards the waveguide cell, wherein the chirped grating diffracts light into diffracted light directions varying across the master grating, and wherein the focusing element focuses light into a multiplicity of zero order light directions; and
interfering the diffracted light and the focused light to form a rolled K-vector grating within the waveguide cell, wherein each interfered diffracted light having a diffracted light direction and focused light having a zero order light direction corresponds to a different K-vector.