Patent · US Active

Slab waveguide and projector with intermodal coupling

US11448815B2 · kind B2 · utility

1Cited by
2References
20Claims
0Family size

Assignee

Inventors

Key dates

Filing dateNov 6, 2020
Grant dateSep 20, 2022
Priority date—
Expiry dateApr 6, 2041

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG02B2027/0178
  • WIPO fieldOptics
  • WIPO sectorInstruments

Abstract

A compact collimator or projector includes a waveguide having a slab core structure supporting at least two lateral modes of propagation. A light beam coupled into a first mode propagates to an edge of the waveguide where it is reflected by a reflector to propagate back. Upon propagation back and forth, the light is converted into a second mode. An out-coupling region, such as an evanescent coupler, is provided to out-couple the light propagating in the second mode. The reflector may have focusing power to collimate the out-coupled light beam. The light beam may be converted from the first to the second mode without being reflected from a reflector.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.