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

Claim 14:
15. The method of claim 13,
wherein 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:
adjusting at least one of a wavelength of the input beam, an incidence angle of the input beam with respect to the PVH mask, or a relative position or a relative orientation between the recording medium layer and the input beam;
forwardly diffracting, by the PVH mask, the input beam as a third set of two 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 the 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.