Method and system for multispectral beam combiner

1. A spectral beam combining system comprising:

a plurality of individual lasers, wherein each of the plurality of individual lasers are operable to emit one of a plurality of laser beams;

a prism having a curved input surface, wherein the curved input surface is operable to collimate the plurality of laser beams received from the plurality of individual lasers and to produce a plurality of collimated laser beams, a second surface, and an output surface, wherein the prism is operable to receive the plurality of laser beams emitted by each of the plurality of individual lasers; and

an immersion grating defined on the second surface, wherein the immersion grating is operable to receive the plurality of collimated laser beams and to produce a plurality of collimated output beams.

2. The spectral beam combining system of claim 1 wherein each of the plurality of laser beams is characterized by a different wavelength.

3. The spectral beam combining system of claim 1 wherein the curved input surface is a first surface of the prism and the output surface is a third surface of the prism.

4. The spectral beam combining system of claim 1 wherein the curved input surface implements a transform lens.

5. The spectral beam combining system of claim 1 wherein the output surface is a third surface of the prism.

6. The spectral beam combining system of claim 1 wherein the prism comprises glass.

7. The spectral beam combining system of claim 1 wherein the prism comprises fused silica.

8. The spectral beam combining system of claim 1 wherein the plurality of laser beams are incident on the curved input surface at different angles such that the plurality of laser beams are collimated and collinear after diffraction from the immersion grating.

9. The spectral beam combining system of claim 1 further comprising a protective cap attached over the immersion grating.

10. The spectral beam combining system of claim 9 further comprising a gas-filled gap disposed between the immersion grating and the protective cap.

11. A monolithic spectral beam combiner comprising:

a structure comprising:

a refractive input element operable to receive a plurality of laser beams, each of the plurality of laser beams being emitted by one of a plurality of individual lasers, wherein the refractive input element is operable to collimate the plurality of laser beams emitted by the plurality of individual lasers and to produce a plurality of collimated laser beams;

a propagation volume; and

an output surface comprising a diffraction grating, wherein the diffraction grating is operable to receive the plurality of collimated laser beams and to produce a plurality of collimated output beams.

12. The monolithic spectral beam combiner of claim 11 wherein the diffraction grating comprises an immersion grating.

13. The monolithic spectral beam combiner of claim 11 wherein the propagation volume comprises an optically transparent material.

14. The monolithic spectral beam combiner of claim 13 wherein the optically transparent material comprises glass.

15. The monolithic spectral beam combiner of claim 13 wherein the optically transparent material comprises fused silica.

16. The monolithic spectral beam combiner of claim 11 wherein the refractive input element comprises a curved surface of a prism.

17. The monolithic spectral beam combiner of claim 16 wherein the plurality of laser beams are incident on the curved surface of the prism at different angles such that the plurality of laser beams are collimated and collinear after diffraction from the diffraction grating.

18. The monolithic spectral beam combiner of claim 17 wherein each of the plurality of laser beams are characterized by a different wavelength.

19. The monolithic spectral beam combiner of claim 11 wherein the diffraction grating comprises a reflective diffraction grating.