Two-dimensional multi-beam stabilizer and combining systems and methods

• US 9,843,154 B2
• Filed: 03/16/2016
• Issued: 12/12/2017
• Est. Priority Date: 02/14/2012
• Status: Active Grant

• Current Assignee: Panasonic Corporation Of North America (Panasonic Holdings Corporation)
• Original Assignee: TeraDiode, Inc. (Panasonic Holdings Corporation)
• Inventors: Tayebati, Parviz, Chann, Bien
• Primary Examiner(s): Alexander, William R
• Application Number:
  US15/071,554
• Publication Number:
  US 20160268761A1
• Time in Patent Office: 636 Days
• Field of Search: 35948704, 359639, 372 25, 372 30, 372 2902
• CPC Class Codes: G02B 27/1006 for splitting or combining different wavelengths G02B27/1086, G02B27/141 take precedence
• CPC Class Codes: H01S 3/08 Construction or shape of optical resonators or components thereof
• CPC Class Codes: H01S 3/0805 by apertures, e.g. pin-holes or knife-edges
• CPC Class Codes: H01S 3/08054 Passive cavity elements acting on the polarization, e.g. a polarizer for branching or walk-off compensation quarter-wave plates in a Q-switch laser H01S3/1124, H01S3/115
• CPC Class Codes: H01S 3/0826 using a diffraction grating
• CPC Class Codes: H01S 3/139 by controlling the mutual position or the reflecting properties of the reflectors of the cavity , e.g. by controlling the cavity length
• CPC Class Codes: H01S 3/2391 emitting at different wavelengths
• CPC Class Codes: H01S 5/141 using a wavelength selective device, e.g. a grating or etalon H01S5/146 takes precedence
• CPC Class Codes: H01S 5/143 Littman-Metcalf configuration, e.g. laser - grating - mirror
• CPC Class Codes: H01S 5/4012 Beam combining, e.g. by the use of fibres, gratings, polarisers, prisms
• CPC Class Codes: H01S 5/4068 with lateral coupling by axially offset or by merging waveguides, e.g. Y-couplers
• CPC Class Codes: H01S 5/4087 emitting more than one wavelength

Abstract

A system and method for stabilizing and combining multiple emitted beams into a single system using both WBC and WDM techniques.

Claims

1. A multi-beam stabilizer and combining system comprising:

a wavelength stabilizer having a dispersive dimension and a non-dispersive dimension, the wavelength stabilizer comprising;

an array of beam emitters each (i) having front and back facets and (ii) emitting a beam from the front facet,

one or more first optical elements (i) having power along the dispersive dimension of the wavelength stabilizer and (ii) arranged to receive the emitted beams and parallelize chief rays of the emitted beams, and

a first dispersive element arranged to receive the beams from the one or more first optical elements and disperse the beams into at least two orders, wherein one of the orders is reflected back to the array of beam emitters by a feedback element, thereby forming a resonator between the back facet of each beam emitter and the feedback element that stabilizes the beam emitted by each beam emitter to a unique wavelength; and

a wavelength combiner having a dispersive dimension and a non-dispersive dimension, the wavelength combiner comprising;

one or more second optical elements, different from the one or more first optical elements, arranged to receive the wavelength-stabilized beams and cause the beams to converge along a beam-combining dimension, and

a second dispersive element, different from the first dispersive element, positioned along a beam-combining dimension, to receive the plurality of converging beams, and transmit the beams as a multi-wavelength output.

2. The system of claim 1, wherein the first dispersive element comprises a grating, a chirped grating, a surface grating, a volume grating, a transmission grating, or a prism.

3. The system of claim 1, wherein the one or more first optical elements are telecentric.

4. The system of claim 1, further comprising collimating optics for collimating the beams emitted by the array of beam emitters.

5. The system of claim 1, wherein the array of beam emitters is one-dimensional or two-dimensional.

6. The system of claim 1, wherein the feedback element is the first dispersive element.

7. The system of claim 1, wherein the feedback element comprises a mirror arranged to receive one of the orders from the first dispersive element and reflect the received order back to the first dispersive element.

8. The system of claim 1, wherein the feedback element comprises (i) a first mirror arranged to receive one of the orders from the first dispersive element and reflect the received order back to the first dispersive element, and (ii) a second mirror arranged to receive a different one of the orders from the first dispersive element and reflect the received order back to the first dispersive element.

9. The system of claim 8, wherein the feedback element comprises one or more optical elements for imaging the beams onto the first mirror and/or the second mirror.

10. The system of claim 8, wherein the feedback element comprises one or more quarter wave plates.

11. The system of claim 8, wherein the feedback element comprises one or more slits for reduction of cross-talk between emitters.

12. The system of claim 1, further comprising one or more third optical elements (i) having power along the non-dispersive dimension of the wavelength stabilizer and (ii) arranged to receive one or more orders from the first dispersive element and image the received one or more orders onto the feedback element.

13. The system of claim 1, further comprising one or more third optical elements (i) having power along the non-dispersive dimension of the wavelength stabilizer and (ii) arranged to receive the wavelength-stabilized beams and cause chief rays thereof to be parallel in the non-dispersive dimension of the wavelength stabilizer.

14. The system of claim 1, further comprising a beam splitter for transmitting wavelength-stabilized beams to the wavelength combiner.

15. The system of claim 1, wherein the wavelength-stabilized beams are received by the wavelength combiner via the back facets of the beam emitters.

16. A multi-beam stabilizer and combining system comprising:

a wavelength stabilizer having a dispersive dimension and a non-dispersive dimension, the wavelength stabilizer comprising;

an array of beam emitters each (i) having front and back facets and (ii) emitting a beam,

one or more first optical elements (i) having power along the dispersive dimension of the wavelength stabilizer and (ii) arranged to receive the emitted beams and converge chief rays of the emitted beams, and

a first dispersive element arranged to receive the beams from the one or more first optical elements and disperse the beams into at least two orders, wherein one of the orders is reflected back to the array of beam emitters by a feedback element, thereby forming a resonator between the back facet of each beam emitter and the feedback element that stabilizes the beam emitted by each beam emitter to a unique wavelength; and

a wavelength combiner having a dispersive dimension and a non-dispersive dimension, the wavelength combiner comprising;

a second dispersive element, different from the first dispersive element, (i) having power along a beam-combining dimension, and (ii) arranged to receive the wavelength-stabilized beams and combine the beams into a multi-wavelength output.

17. The system of claim 16, wherein the wavelength combiner comprises one or more second optical elements, different from the one or more first optical elements, arranged to receive the wavelength-stabilized beams and cause the beams to converge to the second dispersive element.

18. The system of claim 16, wherein at least one of the first or second dispersive elements comprises at least one of a grating, a chirped grating, a surface grating, a volume grating, a transmission grating, or a prism.

19. The system of claim 16, further comprising collimating optics for collimating the beams emitted by the array of beam emitters.

20. The system of claim 16, wherein the array of beam emitters is one-dimensional or two-dimensional.

21. The system of claim 16, wherein the feedback element is the first dispersive element.

22. The system of claim 16, wherein the feedback element comprises a mirror arranged to receive one of the orders from the first dispersive element and reflect the received order back to the first dispersive element.

23. The system of claim 16, wherein the feedback element comprises (i) a first mirror arranged to receive one of the orders from the first dispersive element and reflect the received order back to the first dispersive element, and (ii) a second mirror arranged to receive a different one of the orders from the first dispersive element and reflect the received order back to the first dispersive element.

24. The system of claim 23, wherein the feedback element comprises one or more optical elements for imaging the beams onto the first mirror and/or the second mirror.

25. The system of claim 23, wherein the feedback element comprises one or more quarter wave plates.

26. The system of claim 23, wherein the feedback element comprises one or more slits for reduction of cross-talk between emitters.

27. The system of claim 16, further comprising one or more third optical elements (i) having power along the non-dispersive dimension of the wavelength stabilizer and (ii) arranged to receive one or more orders from the first dispersive element and image the received one or more orders onto the feedback element.

28. The system of claim 16, further comprising one or more third optical elements (i) having power along the non-dispersive dimension of the wavelength stabilizer and (ii) arranged to receive the wavelength-stabilized beams and cause chief rays thereof to be parallel in the non-dispersive dimension of the wavelength stabilizer.

29. The system of claim 16, further comprising a beam splitter for transmitting wavelength-stabilized beams to the wavelength combiner.

30. The system of claim 16, wherein the wavelength-stabilized beams are received by the wavelength combiner via the back facets of the beam emitters.

31. A method of stabilizing and combining an array of emitters each emitting a beam, the method comprising:

forming a stabilizer cavity wherein each emitter forms a resonator with an external reflective surface to thereby stabilize the beam emitted by each emitter to a unique wavelength, wherein each beam emitted by the array of emitters is introduced to a first dispersive element disposed within the resonator;

transmitting the beams of the stabilizer from the first dispersive element into a wavelength combiner comprising (i) at least one combining optical element and (ii) a second dispersive element; and

combining the beams along one dimension to form a multi-wavelength beam output that is transmitted away from the array of emitters.

32. The method of claim 31, wherein the first dispersive element comprises a grating, a chirped grating, a surface grating, a volume grating, a transmission grating, or a prism.

33. The method of claim 31, wherein the second dispersive element comprises a grating, a chirped grating, a surface grating, a volume grating, a transmission grating, or a prism.

34. The method of claim 31, wherein the beams of the stabilizer are transmitted into the wavelength combiner through back facets of the emitters.