Non-telecentric light guide elements

Patent metadata

Field	Value
Publication number	US-11868050-B2
Application number	US-202218053255-A
Country	US
Kind code	B2
Filing date	Nov 7, 2022
Priority date	Oct 29, 2019
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

The present disclosure relates to systems and methods relating to the fabrication of light guide elements. An example system includes an optical component configured to direct light emitted by a light source to illuminate a photoresist material at one or more desired angles so as to expose an angled structure in the photoresist material. The photoresist material overlays at least a portion of a first surface of a substrate. The optical component includes a container containing a light-coupling material that is selected based in part on the one or more desired angles. The system also includes a reflective surface arranged to reflect at least a first portion of the emitted light to illuminate the photoresist material at the one or more desired angles.

First claim

What is claimed is:

1. An optical system comprising:
a substrate, wherein the substrate is optically transparent;
at least one optical waveguide disposed on the substrate;
a plurality of mirror surfaces coupled to the at least one optical waveguide, the plurality of mirror surfaces including at least a first mirror surface and a second mirror surface; and
a lens, wherein the lens is configured to couple light into the at least one optical waveguide, wherein the at least one optical waveguide is configured to guide the light to each of the plurality of mirror surfaces, wherein a first portion of the guided light interacts with the first mirror surface so as to direct first reflected light out of the at least one optical waveguide and through the substrate, wherein a second portion of the guided light interacts with the second mirror surface so as to direct second reflected light out of the at least one optical waveguide and through the substrate.

2. The optical system of claim 1 , wherein the substrate comprises glass.

3. The optical system of claim 1 , wherein the optical waveguide comprises a photoresist material.

4. The optical system of claim 3 , wherein the photoresist material comprises a polymeric photo-patternable material.

5. The optical system of claim 3 , wherein the photoresist material comprises at least one of: SU-8 polymer, Kloe K-Cl negative photoresist, PHOTOPOSIT negative photoresist, or JSR negative tone THB photoresist.

6. The optical system of claim 1 , wherein the lens is a cylindrical lens.

7. The optical system of claim 6 , wherein the cylindrical lens comprises an optical fiber.

8. The optical system of claim 1 , further comprising:
a light-emitter device configured to emit light toward the lens.

9. The optical system of claim 8 , wherein the lens is configured to perform at least one of: focusing the emitted light, defocusing the emitted light, or directing the emitted light into the at least one optical waveguide.

10. The optical system of claim 8 , wherein the light-emitter device comprises a laser assembly having one or more laser bars.

11. The optical system of claim 1 , wherein the first mirror surface is arranged at a first angle with respect to the substrate and the second mirror surface is arranged at a second angle with respect to the substrate.

12. The optical system of claim 11 , wherein the first angle and the second angle are each between 30 degrees and 60 degrees with respect to the substrate.

13. The optical system of claim 11 , wherein the second angle is different than the first angle.

14. The optical system of claim 1 , wherein the plurality of mirror surfaces comprises a reflective material, wherein the reflective material comprises a metallic coating.

15. The optical system of claim 14 , wherein the metallic coating comprises at least one of: titanium, platinum, gold, silver, or aluminum.

16. The optical system of claim 1 , wherein the plurality of mirror surfaces comprises a reflective material, wherein the reflective material comprises a dielectric coating or a dielectric stack.

17. The optical system of claim 1 , wherein the substrate comprises a first surface and a second surface opposite the first surface, wherein the optical waveguide is arranged along the first surface, wherein the first reflected light and the second reflected light are transmitted through the second surface and thereafter into an environment of the optical system.

18. A light detection and ranging (LIDAR) system comprising:
an optical system, wherein the optical system comprises:
a substrate, wherein the substrate is optically transparent;
at least one optical waveguide disposed on the substrate;
a plurality of mirror surfaces coupled to the at least one optical waveguide, the plurality of mirror surfaces including at least a first mirror surface and a second mirror surface; and
a lens, wherein the lens is configured to couple light into the at least one optical waveguide, wherein the at least one optical waveguide is configured to guide the light to each of the plurality of mirror surfaces, wherein a first portion of the guided light interacts with the first mirror surface so as to direct first reflected light out of the at least one optical waveguide and through the substrate, wherein a second portion of the guided light interacts with the second mirror surface so as to direct second reflected light out of the at least one optical waveguide and through the substrate,
wherein the lidar system is configured to obtain information about one or more objects in a given environment.

19. The LIDAR system of claim 18 , wherein the first mirror surface is arranged at a first angle with respect to the substrate and the second mirror surface is arranged at a second angle with respect to the substrate, and wherein the first angle and the second angle are each between 30 degrees and 60 degrees with respect to the substrate.

20. The LIDAR system of claim 19 , wherein the second angle is different than the first angle.

Assignees

• Waymo Llc

Inventors

• Dunphy James
• Hutchison David

Classifications

• G03F7/702 Primary

  Reflective illumination, i.e. reflective optical elements other than folding mirrors, e.g. extreme ultraviolet [EUV] illumination systems · CPC title

• G02B6/4214 Primary

  the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device (G02B6/4246 takes precedence) · CPC title

• G02B6/138

  by using polymerisation · CPC title

• G02B2006/12173

  Masking · CPC title

• G01S7/4818

  using optical fibres · CPC title