Structure for collimating a light source

Patent metadata

Field	Value
Publication number	US-11774774-B2
Application number	US-202117408622-A
Country	US
Kind code	B2
Filing date	Aug 23, 2021
Priority date	Aug 23, 2021
Publication date	Oct 3, 2023
Grant date	Oct 3, 2023

Abstract

A structure can be provided for collimating light from a light source (e.g., vertical cavity surface emitting diodes). The structure can include at least one light source, a pit formed at an output of the at least one light source and a microbead formed in the pit. Microbeads can function as a lens to collimate light emitting from the at least one light source. The structure can provide by forming an array of VCSELs on a substrate, forming a pit in front of each VCSEL of the array of VCSELs, and assembling a microbead in each pit formed in front of each VCSEL. The microbeads can thereby function as lenses to collimate light emitted from the VCSELs.

First claim

What is claimed is:

1. A structure for collimating light, comprising:
at least one light source;
a pit formed at an output of the at least one light source; and
a microbead formed in the pit, wherein the microbead is assembled in the pit by becoming trapped in the pit by settlement out of a suspension;
wherein the microbead functions as a lens to collimate light emitting from the at least one light source.

2. The structure for collimating light of claim 1 , wherein the at least one light source is at least one of: a vertical cavity surface emitting laser (VCSEL), and LED, and edge-emitting laser, a fiberoptic tip.

3. The structure for collimating light of claim 1 , wherein the at least one light source is an array of vertical cavity surface emitting lasers (VCSELs) densely formed on a substrate.

4. The structure for collimating light of claim 1 , wherein the microbead is formed in the pit by self-assembly.

5. The structure for collimating light of claim 1 , wherein the microbead formed in the pit includes slumping of the microbead in the pit.

6. The structure for collimating light of claim 1 , wherein the at least one light source comprises an array of vertical cavity surface emitting lasers (VCSELs) densely packed on a substrate, wherein microbeads are formed in pits formed at outputs of the VCSELS forming the array by self-assembly.

7. The structure for collimating light of claim 6 , wherein the microbeads are formed in the pits in a manner that include slumping of the microbeads in the pits.

8. The structure of claim 1 , wherein:
the at least one light source further comprises an array of vertical cavity surface emitting lasers (VCSELs) densely packed on a substrate;
the pit formed at an output of the at least one light source further comprises pits formed at an output of each of the VCSELs; and
a microbead formed in each of the pits;
wherein the microbeads function as lenses for each of the VCSELs to collimate light emitting from them.

9. A structure for collimating light emitting from an array of vertical cavity surface emitting lasers (VCSELs), comprising:
a pit formed at an output of each VCSEL of the array of VCSELs; and
a microbead formed in each pit, wherein the microbead is assembled in the each pit by becoming trapped in the each pit by settlement out of a suspension;
wherein the microbead functions as a lens to collimate light emitting from each VCSEL.

10. The structure for collimating light of claim 9 , wherein the microbead is formed in each pit by self-assembly.

11. The structure for collimating light of claim 9 , wherein the microbead formed in each pit includes slumping of the microbead in the pit.

12. The structure for collimating light of claim 9 , wherein the array of VCSELs are densely packed on the substrate.

13. The structure for collimating light of claim 9 , wherein the microbead is assembled in each pit formed in front of the each VCSEL of the array of VCSELs.

14. The structure of claim 13 , wherein the microbead assembled in the each pit is slumped into the each pit via at least one of: a thermal or chemical influence to thereby aspherize the microbead to at least one of reduce spherical aberration, improve surface quality, or close an air gap between the microbead and each VCSEL.

15. A method for collimating light emitting from an array of vertical cavity surface emitting lasers (VCSELs), comprising:
forming an array of VCSELs on a substrate;
forming a pit in front of each VCSEL of the array of VCSELs;
assembling a microbead in each pit formed in front of each VCSEL;
slumping the microbead assembled in the each pit via at least one of a thermal or chemical influence to aspherize the microbead, wherein microbeads thereby function as lenses to collimate light emitted from the VCSELs among the array of VCSELs.

16. The method of claim 15 , wherein the pit is part of a die associated with the each VCSEL.

17. The method of claim 15 , wherein the pit comprises a material that is deposited on top of a die associated with the each VCSEL.

18. The method of claim 15 , wherein the microbead is assembled in the each pit by settlement out of a suspension.

19. The method of claim 15 , wherein the microbead is assembled in the each pit by becoming trapped in each pit by settlement out of a suspension.

20. The method of claim 15 , wherein the microbead assembled in the each pit is slumped via at least one of the thermal or chemical influence to thereby aspherize the microbead to at least one of; reduce spherical aberration, improve surface quality, or close an air gap between the microbead and the each VCSEL.

Assignees

• Palo Alto Res Ct Inc
• Xerox Corp

Inventors

• Chamoun Jacob
• Maeda Patrick Y
• Martini Joerg
• Chua Christopher L

Classifications

• G02B27/30 Primary

  Collimators · CPC title

• H01S5/423

  having a vertical cavity · CPC title

• G02B19/0052 Primary

  the light source comprising a laser diode (coupling into light guides using intermediate optical elements G02B6/4204; semiconductor lasers having optical devices external to the laser cavity H01S5/005) · CPC title

• G02B19/0014

  at least one surface having optical power · CPC title

• G02B2003/0093

  characterised by the shape · CPC title