Title:
YAG LASER, LENS FOR FIBER LASER AND LASER PROCESSING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2007/119838
Kind Code:
A1
Abstract:
A glass lens or a quartz lens is employed for refracting and condensing the beam
of a YAG laser or a fiber laser. The lens made of these material often cannot provide
an appropriate front and back curved surfaces when the specific function of a
single lens is performed. Furthermore, aberration may increase in glass and
quartz lenses. In the case of a single fθ lens, when the beam from a YAG or
fiber laser having a circular cross-section is provided to the lens while scanning,
the cross-section of a beam refracted to the peripheral portion may be deformed
in an elliptical form. As a means for solving the problem, the lens is made of ZnSe.
Since ZnSe has a refractive index higher by about 1 than that of glass or quartz,
curvature of the curved surface in front and back of the lens can be decreased and
thereby aberration can be decreased. In the case of an fθ lens, elliptical
deformation of the cross-section of a beam refracted to the periphery can be reduced.
Inventors:
ARAKI TAKASHI (JP)
Application Number:
PCT/JP2007/058222
Publication Date:
October 25, 2007
Filing Date:
April 09, 2007
Export Citation:
Assignee:
SUMITOMO ELEC HARDMETAL CORP (JP)
ARAKI TAKASHI (JP)
ARAKI TAKASHI (JP)
International Classes:
G02B13/00
Foreign References:
| JP2001051191A | 2001-02-23 | |||
| JPH11316338A | 1999-11-16 | |||
| JP2000052073A | 2000-02-22 | |||
| JP2003279702A | 2003-10-02 | |||
| JP2001066402A | 2001-03-16 |
Attorney, Agent or Firm:
KAWASE, Shigeki (705 Mainichihigashi-Bldg.15-16, Nakamichi 3-chome,Higashinari-ku, Osaka-shi, Osaka 25, JP)
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