Multi-laser arrangement, in particular an RGB laser module device

Patent metadata

Field	Value
Publication number	US-11862941-B2
Application number	US-202117235582-A
Country	US
Kind code	B2
Filing date	Apr 20, 2021
Priority date	Apr 20, 2020
Publication date	Jan 2, 2024
Grant date	Jan 2, 2024

Abstract

A multi-laser arrangement, in particular an RGB laser module, having a housing with a housing cap having at least one opening formed therein and a transparent element associated therewith for the passing of electromagnetic radiation. The housing cap coupled to a base plate. A first laser emitting in the red spectral range, a second laser emitting in the green spectral range, and a third laser emitting in the blue spectral range are arranged in the housing. An electrical connection line is routed through the housing to each respective laser. During operation of a laser, a majority of its emitted light passes through the transparent element. Each laser is arranged on a pedestal; spaced apart from the lower surface of the base plate; and is aligned with one another. The main direction of laser emission is substantially parallel to the base plate of the housing.

First claim

What is claimed is:

1. A multi-laser arrangement, in particular an RGB laser module, comprising:
a housing including:
a housing cap having at least one opening formed therein, and a transparent element associated therewith for passing electromagnetic radiation; and;
a base plate;

a first laser emitting light in the red spectral range of the visible spectrum;
a second laser emitting light in the green spectral range of the visible spectrum;
a third laser emitting in light in the blue spectral range of the visible spectrum, the first, second and third lasers being arranged within the housing;
an electrical connection line routed through the housing to each respective laser; and
wherein, during operation of the lasers, a majority of the laser's emitted light passes through the transparent element;
wherein each laser
(i) is arranged on a pedestal in the housing;
(ii) is arranged spaced apart from the lower surface of the base plate; and
(iii) is aligned with one another;

wherein a main direction of laser emission is substantially parallel to the base plate of the housing, wherein the housing has a protective means for the transparent element in the form of a portion laterally protruding beyond the transparent element.

2. The multi-laser arrangement of claim 1 , wherein the housing cap comprises metal or is made of metal and the base plate comprises metal or is made of metal, and the housing cap is joined to the base plate by welding.

3. The multi-laser arrangement of claim 1 , wherein the pedestal is formed integrally with the base plate.

4. The multi-laser arrangement of claim 1 , wherein the base plate comprises or is made of a metal including cold-rolled CRS1010 steel, and wherein the pedestal is made of or comprises a different material than the base plate, the different material including oxygen-free high conductivity (OFHC) copper; and wherein the pedestal is pressed, soldered or welded to the base plate.

5. The multi-laser arrangement of claim 1 , wherein a fast axis collimation (FAC) lens is arranged on the pedestal spaced apart from an end face of one of the lasers.

6. The multi-laser arrangement of claim 1 , wherein the transparent element comprises glass or sapphire or is made of glass or sapphire.

7. The multi-laser arrangement of claim 6 , wherein the transparent element is fixed on the housing cap or on a frame arranged on the housing cap by a glass solder.

8. The multi-laser arrangement of claim 6 , wherein the transparent element is fixed on the housing cap by AuSn.

9. The multi-laser arrangement of claim 6 , wherein the transparent element is welded to the housing cap.

10. The multi-laser arrangement of claim 1 , wherein the transparent element is in the form of a fast axis collimation (FAC) lens or comprises a fast axis collimation (FAC) lens.

11. The multi-laser arrangement of claim 1 , wherein the transparent element is in the form of a fiber board or comprises a fiber board.

12. The multi-laser arrangement of claim 1 , wherein at least that wall of the housing cap on which the transparent element is arranged is inclined relative to the base plate, with an angle of inclination of the wall of the housing cap relative to the normal direction of the lower surface of the base plate in a range from 35° to 60°, preferably from 40° to 50°, most preferably from 43° to 48°.

13. The multi-laser arrangement of claim 1 , further comprising a monitor diode is arranged below the transparent element so that laser light is reflected back from the transparent element and is incident on the monitor diode.

14. The multi-laser arrangement of claim 1 , wherein a normal direction of at least that wall of the housing cap on which the transparent element is arranged is inclined relative to a main emission direction of at least one of the lasers, with an inclination relative to the main emission direction in an angular range from 3° to 15°, preferably from 5° to 10°, most preferably from 6° to 8°.

15. The multi-laser arrangement of claim 1 , further comprising monitor diodes positioned behind the lasers on a carrier associated therewith.

16. The multi-laser arrangement of claim 15 , wherein the monitor diodes are arranged on the carrier which preferably comprises ceramics or is made of ceramics, and wherein a normal direction of the surface of the carrier on which the monitor diodes are arranged is inclined relative to a main emission direction of at least one of the lasers, with an inclination relative to the main emission direction in an angular range from 3° to 15°, preferably from 5° to 10°, most preferably from 6° to 8°.

17. The multi-laser arrangement of claim 16 , wherein the monitor diodes include color filters.

18. The multi-laser arrangement of claim 1 , wherein the housing cap has a plurality of openings, wherein each of these openings has a respective transparent element associated therewith, or wherein all of these openings share one common transparent element associated therewith.

19. The multi-laser arrangement of claim 1 , wherein the housing cap has a plurality of openings, with a respective transparent element arranged at each one of the openings, the transparent element being in the form of a beam-shaping optical element selected from the group of optical elements consisting of: spherical plano-convex and concavo-convex lenses, spherical lenses, hemispherical lenses, aspherical plano-convex and concavo-convex lenses.

20. The multi-laser arrangement of claim 1 , further comprising an optical fiber connected to the housing cap by a fiber connector, the fiber connector being a releasably mateable fiber connector or a permanently mateable fiber connector.

21. The multi-laser arrangement of claim 20 , wherein each laser has an optical fiber associated therewith, and wherein the fibers associated to the lasers are combined in a fiber bundle in which they are packed close to one another with their respective fiber cores and share a common fiber cladding surrounding the fiber cores.

22. The multi-laser arrangement of claim 1 , further comprising monitor diodes and glass-metal feedthroughs for connection lines to the lasers and/or to the monitor diodes.

23. The multi-laser arrangement of claim 1 , wherein the housing is fluid-tight and hermetically sealed and the atmosphere within the housing has an H 2 O content of less than 5000 ppm.

24. The multi-laser arrangement of claim 1 , wherein the base plate of the housing is designed as a reference potential and is current-carrying.

25. The multi-laser arrangement of claim 1 , wherein the base plate serves as a carrier for optical assemblies and the base plate protrudes from below the housing cap.

26. The multi-laser arrangement of claim 1 , wherein an inner surface of the housing cap is blackened with a matt finish.

27. The multi-laser arrangement of claim 1 , wherein the housing has housing dimensions with a height from 1.0 mm to 3.5 mm and/or a width from 4 mm to 10 mm and/or a length from 4 to 10 mm.

28. The multi-laser arrangement of claim 1 , wherein an interior of the housing is free of mirrors, is free of at least partially reflecting mirrors, and/or free of dichroic elements.

29. The multi-laser arrangement of claim 1 , wherein the base plate has a ratio V of L to W (V=L/W),
from 2 to 4, preferably from 3.4 to 4.5 when the transparent element is arranged perpendicular relat

Assignees

• Schott Ag

Inventors

• Hettler Robert
• Ping Amy Soon Li
• Wai Li Ong
• Aowudomsuk Artit

Classifications

• H01S5/4093 Primary

  Red, green and blue [RGB] generated directly by laser action or by a combination of laser action with nonlinear frequency conversion · CPC title

• H01S5/0014

  Measuring characteristics or properties thereof (measuring techniques per se G01J, G01K, G01N, G01R) · CPC title

• H01S5/02218

  Material of the housings; Filling of the housings · CPC title

• H01S5/02251

  using optical fibres · CPC title

• H01S5/02253

  using lenses · CPC title