Wavelength beam combining laser with multiple outputs

• US 8,670,180 B2
• Filed: 08/25/2011
• Issued: 03/11/2014
• Est. Priority Date: 03/05/2010
• Status: Active Grant

• Current Assignee: Panasonic Corporation Of North America (Panasonic Holdings Corporation)
• Original Assignee: TeraDiode, Inc. (Panasonic Holdings Corporation)
• Inventors: Chann, Bien, Huang, Robin
• Primary Examiner(s): PINKNEY, DAWAYNE
• Application Number:
  US13/218,327
• Publication Number:
  US 20110310921A1
• Time in Patent Office: 929 Days
• Field of Search: 359/618, 359/299, 359/624, 359/245, 359/241, 359/244, 359/288, 359/305, 359/285, 359/308, 359311-312, 359290-292, 359/872, 359/263, 359223-224, 359/318, 359/649, 359/846, 359/129, 359/496, 359/631, 359/629, 359/634, 359/636, 359638-640, 359/831, 359833-834, 359/630, 359/341.3, 359/341.33, 359/337.21, 451/28, 451/41, 372/25, 372/92, 372/98, 372/102, 353/31, 353/34, 353/81
• US Class Current: 359/556
• CPC Class Codes: G02B 19/0014 at least one surface having optical power
• CPC Class Codes: G02B 19/0028 refractive and reflective surfaces, e.g. non-imaging catadioptric systems
• CPC Class Codes: G02B 19/0057 in the form of a laser diode array, e.g. laser diode bar semiconductor laser arrays with beam combining arrangement H01S5/4012
• CPC Class Codes: G02B 27/0905 Dividing and/or superposing multiple light beams
• CPC Class Codes: H01S 3/094053 Fibre coupled pump, e.g. delivering pump light using a fibre or a fibre bundle
• CPC Class Codes: H01S 3/09408 Pump redundancy
• CPC Class Codes: H01S 3/094096 Multi-wavelength pumping
• CPC Class Codes: H01S 3/09415 the pumping beam being parallel to the lasing mode of the pumped medium, e.g. end-pumping
• CPC Class Codes: H01S 5/005 Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping H01S5/026, H01S5/18388 take precedence
• CPC Class Codes: H01S 5/4012 Beam combining, e.g. by the use of fibres, gratings, polarisers, prisms
• CPC Class Codes: H01S 5/4031 Edge-emitting structures
• CPC Class Codes: H01S 5/405 Two-dimensional arrays
• CPC Class Codes: H01S 5/4062 with an external cavity or using internal filters, e.g. Talbot filters
• CPC Class Codes: H01S 5/4087 emitting more than one wavelength

Abstract

A system and method for producing a multi-output laser by reconfiguring and apportioning a plurality of electromagnetic beams produced by various wavelength beam combining techniques. The reconfiguring of beams includes individual rotation and selective repositioning of one or more beams with respect to beam'"'"'s original input position.

Claims

1. A multi-output laser system comprising:

a wavelength beam combiner configured to produce a multi-wavelength asymmetrical beam profile, comprising;

a plurality of beam emitters each configured to generate optical radiation having a unique wavelength;

an optical focusing element arranged to intercept optical radiation from each of the plurality of beam emitters and combine the optical radiation along a beam combining dimension to form a multi-wavelength asymmetrical beam profile;

a diffraction element positioned at a region of overlap of the optical radiation to receive and transmit the multi-wavelength asymmetrical beam profile; and

a partially-reflecting output coupler arranged to receive the combined beams from the dispersive element, to reflect a portion of the combined beams toward the dispersive element, and to transmit the combined beams as a multi-wavelength beam comprising optical radiation having a plurality of wavelengths;

an optical symmetrizing element configured to symmetrize the multi-wavelength asymmetrical beam profile; and

an optical apportioning element configured to apportion the symmetrized beam and direct each portion to a distinct location.

2. The multi-output laser system of claim 1, wherein the plurality of beam emitters are arranged in a two-dimensional array, and wherein the wavelength beam combiner further includes:

an optical imaging element configured to image each of the plurality of beam emitters along a slow axis of the beam emitters,

wherein the optical imaging element is configured to image each of the plurality of beam emitters onto the diffraction element.

3. The multi-output laser system of claim 1, wherein the optical apportioning element is a plurality of reflective mirrors.

4. The multi-output laser system of claim 1, wherein the optical apportioning element is configured to focus at least one apportioned profile.

5. The multi-output laser system of claim 1, wherein at least one portion of the symmetrized beam is directed into an optical fiber.

6. The multi-output laser system of claim 1, wherein each apportionment is equal to or more symmetrized than the symmetrized beam it was apportioned from.

7. The multi-output laser system of claim 1, wherein the optical symmetrization element is an optical rotator configured to selectively rotate one or more beams within the multi-wavelength asymmetrical beam.

8. The multi-output laser system of claim 1, wherein the optical radiation from at least one beam emitter is apportioned and directed into more than one distinct location.

9. The multi-output laser system of claim 1, further including a plurality of optical fibers each configured to receive one of the apportioned symmetrized multi-wavelength beam profiles.

10. The multi-output laser system of claim 1, wherein symmetrizing the asymmetric multi-wavelength beam profile comprises rotating each beam of the profile in a range of 80 to 90 degrees.

11. The multi-output laser system of claim 9, wherein each optical fiber is coupled into a fiber laser system comprising a source laser and an optical gain medium.

12. A multi-output laser system comprising:

a wavelength beam combiner configured to produce a multi-wavelength asymmetrical beam profile, comprising;

an optical rotator configured to selectively rotate beams emitted by a plurality of beam emitters,

an optical element configured to receive and deliver the selectively rotated beams onto a dispersive element, wherein the dispersive element transmits the selectively rotated beams as a combined beam profile, and

a partially-reflecting output coupler arranged to receive the combined beams from the dispersive element, to reflect a portion of the combined beams toward the dispersive element, and to transmit the combined beams as an asymmetrical multi-wavelength beam comprising optical radiation having a plurality of wavelengths;

an optical symmetrizing element configured to symmetrize the multi-wavelength asymmetrical beam; and

an optical apportioning element configured to apportion the symmetrized beam and direct each portion to a distinct location.

13. The multi-output laser system of claim 12, wherein at least two of the beam emitters have a fixed-position relationship.

14. The wavelength beam combiner of claim 12, wherein the beam emitters include a first reflective surface and an optical gain medium.

15. The wavelength beam combiner of claim 12, further including a collimation optic configured to receive beams from the beam emitters and collimate one or more beams along a dimension of the beam.

16. The wavelength beam combiner of claim 12, further including a spatial repositioning element configured to spatially-reposition one or more beams prior to being received by the optical element.

17. The multi-output laser system of claim 12, wherein the optical symmetrization element is a spatial repositioner configured to spatially reposition one or more beams with respect to other beams of the asymmetrical multi-wavelength beam profile.

18. A multi-output laser system comprising:

a wavelength beam combiner configured to produce a multi-wavelength asymmetrical beam profile, comprising;

a spatial repositioning element configured to selectively reposition beams emitted by a plurality of beam emitters;

an optical element configured to receive and deliver the selectively repositioned beams onto a dispersive element, wherein the dispersive element transmits the selectively repositioned beams as a combined beam profile, and

a dispersive element positioned to receive and transmit the combined beams, wherein an asymmetric output profile is formed, and

a partially-reflecting output coupler arranged to receive the combined beams from the dispersive element, to reflect a portion of the combined beams toward the dispersive element, and to transmit the combined beams as an asymmetrical multi-wavelength beam comprising a plurality of wavelengths;

an optical symmetrizing element configured to symmetrize the multi-wavelength asymmetrical beam; and

an optical apportioning element configured to apportion the symmetrized beam and direct each portion to a distinct location.

19. The multi-output laser system of claim 18, wherein the plurality of beam emitters produces a two-dimensional profile and the spatial-repositioning element reduces the number of beams along a first dimension while increasing the number of beams across a second dimension.

20. The multi-output laser system of claim 18, wherein at least two of the beam emitters have a fixed-position relationship.

21. The multi-output laser system of claim 18, wherein the optical apportioning element is further comprised of:

a first optical element configured to focus the asymmetric beam profile to a focal plane; and

a plurality of reflective elements placed in the focal path of the first optical element, wherein the reflective elements are configured to apportion and individually direct a portion of the asymmetric beam profile to a distinct location.

22. The wavelength beam combiner of claim 18, wherein the plurality of beam emitters produces a two-dimensional profile and the spatial-repositioning element reduces the number of beams along a first dimension while increasing the number of beams across a second dimension.

23. The wavelength beam combiner of claim 18, wherein at least two of the beam emitters have a fixed-position relationship.

24. The wavelength beam combiner of claim 18, further including an optical rotator configured to selectively rotate beams prior to being received by the optical element.