Patent ID: 7411151
Filing Date: 2008-08-12
Classification: B23K,C03C

Abstract:
1. A method of processing the inside of a transparent material, comprising the steps of: shaping a beam shape of a cross-section in a direction orthogonal to a beam advance direction of a femtosecond laser light in an approximately rectangular shape by passing said femtosecond laser light through a slit of the approximately rectangular shape; allowing the femtosecond laser light, whose beam shape of the cross-section in the direction orthogonal to said advance direction is shaped in the approximately rectangular shape, to enter a condenser lens and focusing the light so that a spatial intensity distribution in a direction parallel to the beam advance direction of the femtosecond laser light has a shape of a substantially perfect circle at a focal spot inside said transparent material by said condenser lens; and processing the inside of said transparent material by the operation at a focal spot of the femtosecond laser light focused inside said transparent material by said condenser lens.