Compact interdependent optical element wavelength beam combining laser system and method

• US 8,724,222 B2
• Filed: 10/31/2011
• Issued: 05/13/2014
• Est. Priority Date: 10/31/2010
• 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): Jones, James
• Application Number:
  US13/286,027
• Publication Number:
  US 20120105968A1
• Time in Patent Office: 925 Days
• Field of Search: 359/621, 359/341.1, 359/556
• US Class Current: 359/621
• 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 2301/03 Suppression of nonlinear conversion, e.g. specific design to suppress for example stimulated brillouin scattering [SBS], mainly in optical fibres in combination with multimode pumping
• 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 3/0941 of a laser diode
• 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 5/0057 for temporal shaping, e.g. pulse compression, frequency chirping
• CPC Class Codes: H01S 5/02325 Mechanically integrated components on mount members or optical micro-benches
• CPC Class Codes: H01S 5/4012 Beam combining, e.g. by the use of fibres, gratings, polarisers, prisms
• CPC Class Codes: H01S 5/405 Two-dimensional arrays
• CPC Class Codes: H01S 5/4056 emitting light in more than one direction
• 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 Compact Interdependent Optical Laser System and Method is designed for use with wavelength beam combining (WBC) systems that utilize both slow-axis and fast-axis WBC. Multiple optical elements having individual and interdependent functionality allow for the system to compact reducing the overall footprint of the system. Additional, configurations incorporating the compact system described herein allow for high-power and brightness scaling.

Claims

1. A laser system comprising:

A plurality of electromagnetic radiation sources each configured to produce a unique wavelength emission beam;

a first and second optical element configured to collectively reduce the image size of the array of emission beams along a first dimension;

a third optical element configured to receive the reduced-in-image size emission beams and overlap the beams along the first dimension;

a dispersive element positioned at a region of overlap to receive and transmit the overlapped beams as a multi-wavelength beam; and

a partially-reflective output coupler arranged to receive the multi-wavelength beam, to reflect a portion of the multi-wavelength beam back to the dispersive element, and to transmit the multi-wavelength beam,

wherein the first and third optical elements collectively are configured to image the array of emission beams along a second dimension.

2. The laser system of claim 1, wherein the second dimension is orthogonal to the first dimension.

3. The laser system of claim 1, wherein each of optical elements may be comprised of a reflective mirror.

4. The laser system of claim 1, wherein the plurality of electromagnetic radiation sources are aligned along the slow-diverging axis of each emission beam.

5. The laser system of claim 4, wherein the first dimension is along the slow-diverging axis of the aligned electromagnetic radiation sources.

6. The laser system of claim 1, further including at least one turning mirror positioned between at least one electromagnetic radiation source and the first optical element, wherein the turning mirror is configured to align the at least one radiation source to form an array with the other electromagnetic radiation source(s).

7. The laser system of claim 1, further including an optical rotator positioned between the electromagnetic radiation sources and the first optical element, wherein the optical rotator is configured to optically rotate each of the emission beams about their respective slow-diverging axis.

8. The laser system of claim 1, further including a spatial repositioning element positioned between the electromagnetic radiation sources and the first optical element, wherein the spatial repositioning element is configured to optically arrange the emission beams in an array.

9. The laser system of claim 8, wherein the array is two-dimensional.

10. The laser system of claim 1, wherein the overall footprint is configured to fit within an 8.5″

×

11″

area.

11. The laser system of claim 1, wherein the power output is 500 watts.

12. The laser system of claim 1, having a BPP less than 20.

13. A scalable laser system comprising:

a plurality of laser modules, wherein each including;

a plurality of electromagnetic radiation sources each configured to produce a unique wavelength emission beam,

a first and second optical element configured to collectively reduce the image size of the array of emission beams along a first dimension,

a third optical element configured to receive the reduced-in-image size emission beams and overlap the beams along the first dimension,

a dispersive element positioned at a region of overlap to receive and transmit the overlapped beams as a multi-wavelength beam, and

a partially-reflective output coupler arranged to receive the multi-wavelength beam, to reflect a portion of the multi-wavelength beam back to the dispersive element, and to transmit the multi-wavelength beam,

wherein the first and third optical elements collectively are configured to image the array of emission beams along a second dimension, and

wherein each module is optically combined using an optical fiber bundle.

14. The scalable laser system of claim 13, wherein each laser module produces at least 500 Watts of power.