Laser head for irradiation and removal of material from a surface of a structure

• US 8,258,425 B2
• Filed: 02/28/2006
• Issued: 09/04/2012
• Est. Priority Date: 03/18/2003
• Status: Expired due to Fees

• Current Assignee: LOMA Linda University Medical Center (Mission Healthcare Services LLC)
• Original Assignee: LOMA Linda University Medical Center (Mission Healthcare Services LLC)
• Inventors: Denney, Paul E., Eastman, Jay R., Fallara, Paul M.
• Primary Examiner(s): ELVE, MARIA ALEXANDRA
• Application Number:
  US11/363,647
• Publication Number:
  US 20060144833A1
• Time in Patent Office: 2,380 Days
• Field of Search: 219/121.67, 219/121.68, 219/121.86, 219/121.69, 219/121.85
• US Class Current: 219/121.67
• CPC Class Codes: B23K 2103/50 Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
• CPC Class Codes: B23K 26/032 using optical means
• CPC Class Codes: B23K 26/0622 by shaping pulses
• CPC Class Codes: B23K 26/0643 comprising mirrors
• CPC Class Codes: B23K 26/08 Devices involving relative movement between laser beam and workpiece
• CPC Class Codes: B23K 26/0884 in at least in three axial directions, e.g. manipulators, robots
• CPC Class Codes: B23K 26/12 in a special atmosphere, e.g. in an enclosure
• CPC Class Codes: B23K 26/123 in an atmosphere of particular gases
• CPC Class Codes: B23K 26/127 in an enclosure
• CPC Class Codes: B23K 26/128 Laser beam path enclosures
• CPC Class Codes: B23K 26/1476 Features inside the nozzle for feeding the fluid stream through the nozzle
• CPC Class Codes: B23K 26/16 Removal of by-products, e.g. particles or vapours produced during treatment of a workpiece by a fluid stream B23K26/142
• CPC Class Codes: B23K 26/206 Laser sealing
• CPC Class Codes: B23K 26/40 taking account of the properties of the material involved
• CPC Class Codes: B23K 37/0217 the guide member being fixed to the workpiece

Abstract

A laser head for irradiating an interaction region of a structure with laser light to remove material from the structure. The laser head includes a housing, an anchoring mechanism, and a connector coupled to the housing and optically coupled to a laser generator. The anchoring mechanism is reversably coupled to the housing and releasably affixed to the structure by vacuum pressure. The anchoring mechanism releasably holds the laser head at a selected position in relation to the structure. The connector transmits laser light from the laser generator. The laser head further includes a plurality of optical elements contained in the housing. The laser head further includes a containment plenum coupled to the housing. The containment plenum is optically coupled to the plurality of optical elements to receive the laser light. The containment plenum confines the material and removes the material from the interaction region resulting from irradiating the structure with the laser light.

Claims

1. A laser head for irradiating an interaction region of a structure with laser light to remove material from the structure, the laser head comprising:

a housing;

an anchoring mechanism reversably coupled to the housing and releasably affixed to the structure by vacuum pressure, the anchoring mechanism releasably holding the laser head at a selected position in relation to the structure;

a connector coupled to the housing and optically coupled to a laser generator, the connector transmitting laser light from the laser generator;

a plurality of optical elements contained in the housing and optically coupled to the connector to receive laser light from the connector; and

a containment plenum coupled to the housing, the containment plenum optically coupled to the plurality of optical elements to receive the laser light from the plurality of optical elements, the containment plenum confining the material and removing the material from the interaction region resulting from irradiating the structure with the laser light.

2. The laser head of claim 1, wherein the plurality of optical elements comprises a first mirror and a second mirror.

3. The laser head of claim 2, wherein the first mirror is mounted on a first adjustable assembly in the housing, wherein alignment of the laser light can be optimized by adjusting the first adjustable assembly.

4. The laser head of claim 2, wherein the second mirror is mounted on a second adjustable assembly in the housing, wherein alignment of the laser light can be optimized by adjusting the second adjustable assembly.

5. The laser head of claim 2, wherein the first mirror has a curvature adapted to modify a beam profile of the laser light.

6. The laser head of claim 2, wherein the second mirror has a curvature adapted to modify a beam profile of the laser light.

7. The laser head of claim 2, wherein the first mirror reflects the laser light by a first non-zero angle and the second mirror reflects the laser light by a second non-zero angle, wherein the first non-zero angle is approximately equal to the negative of the second non-zero angle.

8. The laser head of claim 1, wherein the plurality of optical elements comprises a lens in the housing through which the laser light propagates.

9. The laser head of claim 7, wherein the lens is mounted in an adjustable assembly in the housing, wherein alignment and focus of the laser light can be optimized by adjusting the assembly.

10. The laser head of claim 1, wherein the connector comprises a lens mounted in the connector, the lens collimating the laser light.

11. The laser head of claim 1, wherein the connector is optically coupled to the laser generator via an optical fiber.

12. The laser head of claim 1, wherein the laser head further comprises a handle that facilitates transporting and positioning the laser head at a selected location.

13. The laser head of claim 1, wherein the laser head further comprises a coupler to releasably couple the housing to the anchoring mechanism.

14. The laser head of claim 13, wherein the coupler comprises at least one recess that releasably couples to a corresponding protrusion of the anchoring mechanism.

15. The laser head of claim 13, wherein the coupler comprises at least one protrusion that releasably couples to a corresponding recess of the anchoring mechanism.

16. The laser head of claim 13, wherein the coupler comprises at least one collar that releasably couples to a corresponding rod of the anchoring mechanism at a plurality of locations along the rod.

17. The laser head of claim 13, wherein the coupler comprises:

a first collar that releasably couples to a first rod of the anchoring mechanism; and

a second collar that releasably couples to a second rod of the anchoring mechanism.

18. The laser head of claim 17, wherein the first collar detaches from the first rod and the second collar rotatably couples to the second rod.