Patent ID: 11860573
Assignee: META PLATFORMS TECHNOLOGIES, LLC
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 13:
14. The method of claim 13,
wherein the PVH mask is a first PVH mask, the polarization interference pattern is a first polarization interference pattern, and the first polarization interference pattern is recorded in a first portion of the recording medium layer, and
wherein the method further comprises:
replacing the first PVH mask with a second PVH mask;
forwardly diffracting, by the second PVH mask, the input beam as a third set of two collimated circularly polarized beams;
converting, by the polarization conversion element, the third set of two collimated circularly polarized beams into a fourth set of two collimated circularly polarized beams having opposite handednesses, the two collimated circularly polarized beams in the fourth set interfering with one another to generate a second polarization interference pattern; and
recording the second polarization interference pattern in a second portion of the recording medium layer.