NORMAL TEMPERATURE JOINING METHOD FOR WORKPIECE BY FEMTOSECOND LASER

摘要

PROBLEM TO BE SOLVED: To provide a normal temperature joining method of a workpiece where only the surface layer of the workpiece is easy to remove.

SOLUTION: This normal temperature joining method of a sapphire board is provided to adjust the wavelength of a femtosecond laser beam 4 by using a femtosecond laser in order to transmit the laser beam 4 through a surface 5a of the sapphire board 5, and to converge the laser beam 4 on a back face 5b of the sapphire board 5. Thus, the laser beam 4 of a super-short pulse is converged on the back face 5b of the sapphire board 5 so that a surface layer 5c such as an absorbing layer or an oxide layer existing on the back face can be removed.

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