Methods of and systems for processing using adjustable beam characteristics

1. A method comprising:

perturbing an optical beam propagating within a first section of fiber to adjust one or more beam characteristics in the first section of fiber or a second section of fiber or a combination thereof;

guiding the perturbed optical beam into the second section of fiber;

maintaining at least a portion of one or more adjusted beam characteristics within the second section of fiber having two or more confinement regions, wherein the first section of fiber and the second section of fiber form at least a portion of a continuous length of fiber; and

generating an output beam from the second length of fiber.

2. The method of claim 1 , further comprising:

adjusting a beam parameter product (BPP) of the output beam for one or more of ablating, cladding, cutting, drilling, engraving, glazing, heat-treating, marking, patterning, roughening, smoothing, surface texturing, trepanning, or welding, or any combination thereof, one or more parts of a product.

3. The method of claim 1 , further comprising:

adjusting a beam quality factor (M 2 factor) of the output beam for one or more of ablating, cladding, cutting, drilling, engraving, glazing, heat-treating, marking, patterning, roughening, smoothing, surface texturing, trepanning, or welding, or any combination thereof, one or more parts of a product.

4. The method of claim 1 , further comprising:

modulating the output beam while one or more of ablating, cladding, cutting, drilling, engraving, glazing, heat-treating, marking, patterning, roughening, smoothing, surface texturing, trepanning, or welding, or any combination thereof, one or more parts of a product.

5. The method of claim 4 , wherein the output beam is generated as a series of pulses, one or more characteristics of the output beam are modified in a series of pulses, or the output beam is generated as a series of pulses and the one or more characteristics of the output beam are modified in a series of pulses.

6. The method of claim 4 , wherein the output beam is modulated at a selected frequency, one or more characteristics of the output beam are modulated at a selected frequency, or the output beam and the one or more characteristics of the output beam are modulated at a selected frequency.

7. The method of claim 4 , wherein the output beam is modulated at a selected duty cycle, one or more characteristics of the output beam are modulated at a selected duty cycle, or the output beam and the one or more characteristics of the output beam are modulated at a selected duty cycle.

8. The method of claim 1 , further comprising:

using the output beam for one or more of ablating, cladding, cutting, drilling, engraving, glazing, heat-treating, marking, patterning, roughening, smoothing, surface texturing, trepanning, or welding, or any combination thereof, one or more parts of a product.

9. The method of claim 1 , further comprising:

increasing power density of the output beam for one or more of ablating, cladding, cutting, drilling, engraving, glazing, marking, patterning, roughening, surface texturing, trepanning, or welding, or any combination thereof, one or more parts of a product.

10. The method of claim 1 , further comprising:

decreasing power density of the output beam for one or more of cladding, cutting, engraving, glazing, heat-treating, marking, patterning, smoothing, surface texturing, or trepanning, or any combination thereof, one or more parts of a product.

11. The method of claim 1 , further comprising:

increasing beam diameter of the output beam for heat-treating, smoothing, or heat-treating and smoothing one or more parts of a product.

12. The method of claim 1 , further comprising:

in additive processing, alternately using the output beam to pre-heat powder prior to fusing the powder and using the output beam to fuse the powder.

13. The method of claim 1 , further comprising:

in additive processing, alternately using the output beam to pre-heat powder prior to fusing the powder and using the output beam to post-heat the fused powder.

14. The method of claim 1 , further comprising:

in additive processing, alternately using the output beam to fuse powder and using the output beam to post-heat the fused powder.

15. The method of claim 1 , further comprising:

in additive processing, alternately using the output beam to pre-heat powder prior to fusing the powder, using the output beam to fuse the powder, and using the output beam to post-heat the fused powder.

16. The method of claim 1 , further comprising:

in additive processing, using a first portion of the output beam to pre-heat powder prior to fusing the powder, and simultaneously using a second portion of the output beam to fuse the powder.

17. The method of claim 1 , further comprising:

in additive processing, using a first portion of the output beam to fuse powder, and simultaneously using a second portion of the output beam to post-heat the fused powder.

18. The method of claim 1 , further comprising:

in additive processing, using a first portion of the output beam to pre-heat powder prior to fusing the powder, and simultaneously using the first portion of the output beam to post-heat the fused powder.

19. The method of claim 1 , further comprising:

in additive processing, using a first portion of the output beam to pre-heat powder prior to fusing the powder, simultaneously using a second portion of the output beam to fuse the powder, and simultaneously using the first portion of the output beam to post-heat the fused powder.

20. The method of claim 1 , wherein:

the first section of fiber has a first refractive-index profile (RIP); and

the second section of fiber has a second RIP;

wherein the first RIP differs from the second RIP.

21. The method of claim 1 , wherein:

the first section of fiber has a first refractive-index profile (RIP); and

the second section of fiber has a second RIP;

wherein the first RIP is the same as the second RIP.