Hybrid waveguide device in powerful laser systems

• US 8,554,037 B2
• Filed: 09/30/2010
• Issued: 10/08/2013
• Est. Priority Date: 09/30/2010
• Status: Expired due to Fees

• Current Assignee: Rayd LLC
• Original Assignee: Raydiance, Inc. (Coherent Corp.)
• Inventors: Peng, Xiang, Mielke, Michael, Booth, Timothy
• Primary Examiner(s): PAK, SUNG H
• Application Number:
  US12/895,834
• Publication Number:
  US 20120082410A1
• Time in Patent Office: 1,104 Days
• Field of Search: 385/125
• US Class Current: 385/125
• CPC Class Codes: G02B 6/02304 Core having lower refractive index than cladding, e.g. air filled, hollow core
• CPC Class Codes: G02B 6/024 with polarisation maintaining properties
• CPC Class Codes: G02B 6/32 having lens focusing means positioned between opposed fibre ends with lens being an integral part of the single fibre end G02B6/262
• CPC Class Codes: G02B 6/3624 Fibre head, e.g. fibre probe termination optical details of light guide terminations G02B6/241; reshaping of light guides G02B6/2552; optical details of coupling light into or out of fibre end G02B6/262
• CPC Class Codes: G02F 1/3528 for producing a supercontinuum
• CPC Class Codes: G02F 1/365 in an optical waveguide structure G02F1/377, G02F1/395 take precedence

Abstract

A hybrid waveguide device includes a hollow core fiber having a core formed by a combination of solid material and gases. The hybrid nature of the core allows the hybrid device to transport a high energy high power laser beam having an ultra-short pulse width without damage to the hybrid device due to a higher tolerance of irradiance than single-matter cores. A waveguide device having a core with gases in addition to solid matter is characterized by a lower nonlinear refractive index coefficient (n₂), lower numerical aperture, larger delivering laser beam size, and higher ionization potential of the gases. As a result, the hybrid waveguide fiber can transport ultra-short laser pulses having ablative energy levels and power levels, for example from a laser generating subassembly to a laser material-modification subassembly.

Claims

1. A hybrid waveguide device for providing an ultra-short duration optical pulse,

comprising:

a hybrid waveguide fiber;

a first core region comprising at least one of a gas, a gas mixture and a vacuum within the hybrid waveguide fiber and configured to transport a laser beam having an ultra-short pulse; and

a second core region surrounding the first core region, the second core region comprising a solid web structure having a plurality of hollow regions each filled with at least one of a gas, a gas mixture, and a vacuum within the hybrid waveguide fiber, wherein the second core region is configured such that gas characteristics within select hollow regions are adjusted to achieve specific light transport characteristics for the laser beam.

2. The waveguide device of claim 1, the waveguide fiber including a hollow core hybrid fiber, the first core region and the second core region contained within the hybrid fiber,

the first core region and the second core region forming a core of the hybrid waveguide fiber.

3. The waveguide device of claim 1, the first core region including a hollow region with a core diameter greater than 30 micrometers.

4. The waveguide device of claim 1, wherein the second core region includes Kagome-patterned web structure.

5. The waveguide device of claim 1, the second core region including at least one of a gas, a gas mixture, and a vacuum throughout the length of the waveguide fiber.

6. The waveguide device of claim 1, wherein the waveguide fiber is able to transport a laser beam having a pulse width duration of less than 10 picoseconds.

7. The waveguide device of claim 1, wherein the waveguide fiber is able to transport a laser beam having a pulse energy of greater than 10 microjoule.

8. The waveguide device of claim 1, wherein the waveguide fiber is able to transport a laser beam having an average optical power of greater than 1 watt.

9. The waveguide device of claim 1, wherein the waveguide fiber is able to transport a laser beam having a wavelength from 200 nanometers to 10,000 nanometers.

10. The waveguide device of claim 1, wherein the waveguide fiber is able to transport a laser beam having a pulse fluence of greater than 0.1 joules per square centimeter (J/cm2).

11. The waveguide device of claim 1, wherein at least one of the gases is a noble gas.

12. The waveguide device of claim 1, wherein the second core region is configured for polarization maintaining or polarizing functionality.

13. The waveguide device of claim 1, further comprising one or more gas fittings coupled to the waveguide fiber and configured to introduce the gas into the waveguide fiber from fiber ends, along the fiber, or a combination of fiber ends and along the fiber.

14. The waveguide device of claim 1, the waveguide fiber configured to convert input photons at one wavelength into output photons at a different wavelengths.

15. The waveguide device of claim 1, the waveguide fiber configured to induce enhanced temporal or spatial confinement of the laser pulse energy.

16. The waveguide device of claim 1, the waveguide fiber configured to perform linear-optical-effect chromatic dispersion to modify a propagating laser pulse.

17. The waveguide device of claim 1, the waveguide fiber configured to perform as an index guiding mechanism within the core.

18. The waveguide device of claim 1, the waveguide fiber configured to perform as a photonic bandgap guiding mechanism in the core.

39. The waveguide device of claim 13, wherein the one or more gas fittings and the hybrid waveguide fiber are configured to adjust the at least one of the gas, the gas mixture, and the vacuum within the select hollow regions.

19. A method for transporting a laser beam using a waveguide device, comprising:

receiving a laser beam having an ultra-short pulse width by an input portion of a hybrid waveguide device;

transporting the laser beam through a core of the hybrid waveguide device, the core of the hybrid waveguide device comprising a first portion and a second portion, the first portion containing at least one of a gas, a gas mixture, and a vacuum, the second portion comprising a solid web structure having a plurality of hollow regions each filled with at least one of a gas, a gas mixture, and a vacuum within the hybrid waveguide fiber, wherein gas characteristics within select hollow regions are adjusted to achieve specific light transport characteristics for the laser beam; and

providing the laser beam through an output portion of the hybrid waveguide device.

20. The method of claim 19, further comprising receiving the gas into a portion of a waveguide device fiber.

21. The method of claim 19, further comprising adjusting the amount of gas, gases, gas mixture, and vacuum in the core of the waveguide device.

22. The method of claim 19, wherein at least one of the gases is a noble gas.

23. The method of claim 19, wherein the gas is helium or argon.

24. The method of claim 19, wherein the solid web structure is comprised of silica web structure.

25. The method of claim 19, wherein the first core portion is a hollow core.

26. The method of claim 19, wherein the plurality of hollow regions are formed along the length of the waveguide.

27. The method of claim 19, wherein the second core portion is configured in a Kagome pattern.

28. The method of claim 19, further comprising converting the signal from a first wavelength to a second wavelength, the provided laser beam having the second wavelength, or a combination of wavelengths.

29. The method of claim 19, further comprising performing temporal compression of the laser bean within the waveguide, the provided laser beam being temporally compressed.

30. The method of claim 19, wherein the waveguide device and output portion have a cross-section diameter less than ten millimeters (<

10 mm).

31. The method of claim 19, wherein the waveguide device and output portion are integrated to form a micro-optical medical catheter assembly.

32. A hybrid waveguide device subassembly, comprising:

a housing;

a fiber connector within the housing and configured to connect to a hybrid waveguide fiber including a first core region comprising at least one of a gas, a gas mixture and a vacuum, and a second core region surrounding the first core region and comprising a solid web structure having a plurality of hollow regions each filled with at least one of a gas, a gas mixture, and a vacuum; and

one or more gas fittings configured to receive and release gas into the housing,

the hybrid waveguide device subassembly configured to provide gas received through the gas fitting to the hybrid waveguide fiber through the fiber connector, wherein gas is provided such that gas characteristics within select hollow regions are adjusted to achieve specific light transport characteristics for the laser beam.

33. The waveguide device subassembly of claim 32, further comprising a focusing lens for focusing a laser beam.

34. The waveguide device subassembly of claim 32, wherein a laser beam is provided to the hybrid waveguide fiber by the fiber connector.

35. The waveguide device subassembly of claim 32, wherein a laser beam is received from the hybrid waveguide fiber by the fiber connector.

36. The waveguide device subassembly of claim 32, the fiber connector configured to transport a laser beam having an ultra-short pulse width.

37. The waveguide device subassembly of claim 32, wherein the subassembly diameter is less than ten millimeters (<

10 mm).

38. The waveguide device subassembly of claim 32, wherein the subassembly is integrated in a medical catheter assembly.