High brightness dense wavelength multiplexing laser

Patent metadata

Field	Value
Publication number	US-9596034-B2
Application number	US-201615172166-A
Country	US
Kind code	B2
Filing date	Jun 3, 2016
Priority date	Oct 14, 2013
Publication date	Mar 14, 2017
Grant date	Mar 14, 2017

Abstract

The present disclosure describes systems and methods for beam wavelength stabilization and output beam combining in dense wavelength multiplexing (DWM) systems. Systems and methods are described for performing beam wavelength stabilization and output beam combining in DWM systems while achieving increased wall-plug efficiency and enhanced beam quality. Interferometric external resonator configurations can be used to greatly increase the brightness of DWM system output beams by stabilizing the wavelengths of the beams emitted by the emitters of the DWM laser source. The resonant cavities described by the present disclosure provide advantages over the prior art in the form of decreased cost, increased wall plug efficiency and increased output beam quality. Particular implementations of the disclosure achieve increased wall plug efficiency and increased output beam quality through a combination of innovative cavity designs and the utilization of reflection diffraction elements for beam combining.

First claim

The invention claimed is:

1. A system for stabilizing the wavelength of beams emitted by a plurality of beam emitters, the system comprising:
the plurality of beam emitters, each beam emitter emitting a beam;
a first reflection diffraction element; and
a feedback branch comprising a spatial filtering system;
wherein the first reflection diffraction element directs a portion of the beams originating at the array into the feedback branch as feedback branch input,
wherein the feedback branch directs a portion of the feedback branch input back into the plurality of beam emitters, and
wherein the spatial filtering system is configured to perform spatial mode blocking.

2. The beam stabilization system of claim 1 , wherein the first reflection diffraction element receives the beams originating from the plurality of beam emitters and directs, into the feedback branch as a feedback branch input, a reflection of the beams originating from the plurality of beam emitters.

3. The system of claim 2 , wherein the first reflection diffraction element receives the beams originating from the plurality of beam emitters and directs, as a system output, a diffraction of the beams originating from the plurality of beam emitters.

4. The system of claim 1 , wherein the plurality of beam emitters is an array of diode beam emitters.

5. The system of claim 4 , wherein each beam emitter in the array of diode beam emitters emits a beam with an asymmetric profile, wherein each beam has a fast axis and a slow axis.

6. The system of claim 1 , wherein each emitter in the plurality of beam emitters comprises a waveguide, and
wherein at least thirty percent of the optical power of the portion of the feedback branch input directed back into the plurality of beam emitters is coupled into the plurality of waveguides.

7. The system of claim 1 , wherein the spatial filtering system comprises one of the group consisting of: an aperture, a diaphragm, a waveguide structure, and a set of mirrors that include a gradient layer.

8. A system for stabilizing the wavelength of beams emitted by a plurality of beam emitters, the system comprising:
the plurality of beam emitters, each beam emitter configured to emit a beam;
a first reflection diffraction element configured to receive the beams emitted by the plurality of beam emitters via front facets of the beam emitters; and
a feedback branch comprising a spatial filtering system;
wherein the first reflection diffraction element directs a portion of the beams originating at the array into the feedback branch as feedback branch input, and
wherein the feedback branch directs a portion of the feedback branch input back into the plurality of beam emitters.

9. The beam stabilization system of claim 8 , wherein the first reflection diffraction element receives the beams originating from the plurality of beam emitters and directs, into the feedback branch as a feedback branch input, a reflection of the beams originating from the plurality of beam emitters.

10. The system of claim 9 , wherein the first reflection diffraction element receives the beams originating from the plurality of beam emitters and directs, as a system output, a diffraction of the beams originating from the plurality of beam emitters.

11. The system of claim 8 , wherein the plurality of beam emitters is an array of diode beam emitters.

12. The system of claim 11 , wherein each beam emitter in the array of diode beam emitters emits a beam with an asymmetric profile, wherein each beam has a fast axis and a slow axis.

13. The system of claim 8 , wherein each emitter in the plurality of beam emitters comprises a waveguide, and
wherein at least thirty percent of the optical power of the portion of the feedback branch input directed back into the plurality of beam emitters is coupled into the plurality of waveguides.

14. The system of claim 8 , wherein the spatial filtering system comprises one of the group consisting of: an aperture, a diaphragm, a waveguide structure, and a set of mirrors that include a gradient layer.

15. A system for stabilizing the wavelength of beams emitted by a plurality of beam emitters, the system comprising:
the plurality of beam emitters, each beam emitter emitting a beam;
a first reflection diffraction element;
a second reflection diffraction element; and
a feedback branch comprising a spatial filtering system;
wherein the feedback branch directs a portion of the feedback branch input back into the plurality of beam emitters,
wherein the first reflection diffraction element receives the beams originating from the plurality of beam emitters and directs, into the feedback branch as a feedback branch input, a diffraction of the beams originating from the array, and
wherein the second reflection diffraction element receives a reflection of the beams originating from the plurality of beam emitters from the first reflection diffraction element without the reflection passing through any of the plurality of beam emitters.

16. The beam stabilization system of claim 15 , wherein the first reflection diffraction element receives a reflection of the feedback branch input as a first feedback branch output and directs, into a second feedback branch a reflection of the first feedback branch output.

17. The system of claim 16 , wherein the second reflection diffraction element receives the beams originating from the plurality of beam emitters and directs, as a system output, a diffraction of the beams originating from the plurality of beam emitters.

18. The system of claim 15 , wherein the plurality of beam emitters is an array of diode beam emitters.

19. The system of claim 18 wherein each beam emitter in the array of diode beam emitters emits a beam with an asymmetric profile, wherein each beam has a fast axis and a slow axis.

20. The system of claim 1 , wherein each emitter in the plurality of beam emitters comprises a waveguide, and
wherein at least thirty percent of the optical power of the portion of the feedback branch input directed back into the plurality of beam emitters is coupled into the plurality of waveguides.

Assignees

• Trumpf Laser Gmbh

Inventors

• Zimer Hagen
• Killi Alexander
• Tillkorn Christoph
• Ried Steffen

Classifications

• G02B7/1815

  with cooling or heating systems (cooling arrangements for laser mirrors H01S3/0401) · CPC title

• H01S3/0401

  of optical elements being part of laser resonator, e.g. windows, mirrors, lenses · CPC title

• H01S3/0805

  by apertures, e.g. pin-holes or knife-edges · CPC title

• H04J14/02

  Wavelength-division multiplex systems · CPC title

• H01S5/4087

  emitting more than one wavelength · CPC title