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Paramétrages

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1. WO1999004317 - LASER UV SOLIDE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:

1. A method for ablating material including:
(a) directing a laser beam through a frequency
doubling compound;
(b) then directing said beam through plurality of frequency converting compounds;
(c) then directing said beam through a beam separating system; and
(d) directing said beam or a portion of said beam onto an area of said material to ablate said material,
wherein said frequency converting compounds include at least one Caesium Lithium Borate (CsLiB60 or CLBO)
crystal .

2. A method as claimed in claim 1, including directing said beam or portion of said beam to a laser delivery system and then onto said area of said material by means of said laser delivery system.

3. A method as claimed in claim 2, wherein said laser delivery system includes a large beam delivery system, a scanning system or a fibre optic delivery system.

4. A method as claimed in any one of the preceding claims, including performing said method by means of at least one CLBO crystal, is in a sealed dry, inert atmosphere.

5. A method as claimed in any one of the preceding claims, wherein said at least one CLBO crystal is maintained at a temperature of between 40°C and 200°C.

6. A method as claimed in claim 5, wherein said at least one CLBO crystal is maintained at a temperature of
approximately 80°C.

7. A method as claimed in any of the preceding claims where said laser beam has a fundamental wavelength of between 0.5 and 2.5 micron.

8. A method as claimed in claim 7, wherein said laser beam has a fundamental wavelength of approximately 1 micron.

9. A method as claimed in any one of the preceding claims, including providing said laser beam by means of a Nd:YAG laser source or a Nd:YLF laser source.

10. A method as claimed in any one of the preceding claims, wherein said beam separating system is a dispersing prism or a dichroic mirror.

11. A method as claimed in any one of the preceding claims, wherein said material is human or animal tissue.

12. A method as claimed in claim 11, wherein said material is tooth.

13. A method as claimed in any one of claims 1 to 11, wherein said tissue is corneal tissue.

14. A method as claimed in claim 13, wherein said method is for refractive surgery of the cornea by PRK or LASIK.

15. A method as claimed in any one of claims 11 to 14, wherein said method includes pulsing said beam with a low pulse rate and a high energy per pulse.

16. A method as claimed in claim 15, wherein said pulse rate is between 5 and 30 Hz.

17. A method as claimed in either claim 15 or 16, wherein said an UV energy of between 3 and 50 mJ per pulse is applied to said material.

18. An apparatus for laser ablation of material including: a laser source for providing a laser beam of infra-red light;
first frequency doubling means for doubling the frequency of said infra-red beam;
beam conversion means for converting said infra-red beam into an ultra-violet beam including:
a second frequency doubling means for redoubling said frequency to produce a twice doubled frequency beam and
a fifth harmonic frequency mixing means for
mixing said twice frequency doubled beam with said
infra-red beam to produce an ultra-violet fifth
harmonic of said infra-red beam;
a beam separating system for separating said ultraviolet harmonic; and
a laser delivery system for delivering said ultraviolet harmonic to said material,
wherein said apparatus is arranged to direct said infra-red beam through said first frequency doubling means and said beam conversion means, and to direct light from said beam conversion means to said beam separating system and then to said laser delivery system, and said fifth harmonic frequency mixing means or said second frequency doubling means includes a Caesium Lithium Borate (CsLiB60 or CLBO) crystal.

19. An apparatus as claimed in claim 18, wherein said laser source provides said beam with a wavelength in the range 0.5 to 2.5 micron.

20. An apparatus as claimed in either claim 18 or 19, wherein said beam has a fundamental wavelength of
approximately 1 micron.

21. An apparatus as claimed in any one of claims 18 to 20, wherein said apparatus includes a heating means for
maintaining said CLBO crystal at one or more temperatures between 40°C and 200°C.

22. An apparatus as claimed in claim 21, wherein said heating means is controllable to maintain said CLBO crystal at a temperature of approximately 80°C.

23. An apparatus as claimed in any one of claims 18 to 22, wherein said apparatus includes a sealable housing for sealing said CLBO crystal in a sealed dry, inert
atmosphere.

24. An apparatus as claimed in claim 23, wherein said housing is transparent to fundamental and harmonically generated laser beams.

25. An apparatus as claimed in any one of claims 18 to 20, wherein both said fifth harmonic frequency mixing means and said second frequency doubling means each include a
separate CLBO crystal for generating fourth and fifth harmonics of said beam respectively.

26. An apparatus as claimed in claim 25, including either a heating means for heating both of said separate crystals or separate heating means for each of said crystals.

27. An apparatus as claimed in either claim 25 or 26, including either a sealable housing for sealing both of said separate CLBO crystals in a sealed dry/ inert
atmosphere, or separate sealable housings for sealing each of said separate CLBO crystals in a sealed dry, inert atmosphere.

28. An apparatus as claimed in any one of claims 18 to 27, wherein said beam separating system is a dispersing prism or a dichroic mirror.

29. An apparatus as claimed in any one of claims 18 to 28, wherein said laser delivery system includes a large beam delivery system, a scanning system or a fibre optic
delivery system.

30. An apparatus as claimed in any one of claims 18 to 29, wherein said apparatus is for laser ablation of animal or human tissue.

31. An apparatus as claimed in any one of claims 18 to 30, wherein said material is tooth.

32. An apparatus as claimed in any one of claims 18 to 30, wherein said material is corneal tissue.

33. An apparatus as claimed in claim 32, wherein said apparatus is for refractive surgery of the cornea by PRK or LASIK.

34. An apparatus as claimed in any one of claims 30 to 32, including beam pulsing means for pulsing said beam with a low pulse rate and a high energy per pulse.

35. An apparatus as claimed in claim 34, wherein said pulse rate is between 5 and 30 Hz.

36. An apparatus as claimed in either claim 34 or 35, wherein an UV energy of between 3 and 50 mJ per pulse is applied to said material.

37. An apparatus as claimed in any one of claims 18 to 36, wherein said laser source is a Nd3+ doped laser medium.

38. An apparatus as claimed in any one of claims 18 to 36, wherein said laser source is a Nd:YAG, Nd:YLF, Nd:glass or Nd:YV04 laser source.

39. An apparatus as claimed in any one of claims 18 to 38, further including a casing, wherein said laser source includes a optic fibre or optic fibre input, and said CLBO crystal is located within said casing.

40. An apparatus as claimed in claim 39, wherein said apparatus constitutes a laser ablation handpiece or probe.