Marking method and marking apparatus using multiple photon...

Details Marking method and marking apparatus using multiple photon... Marking method and marking apparatus using multiple photon...

2005-11-29

2005-11-29

Elve, M. Alexandra (Department: 1725)

Electric heating

Metal heating

By arc

C219S121680, C219S121850

Reexamination Certificate

active

06969820

ABSTRACT:
A marking method is provided which permits an easy detecting of the presence of a mark without using a specific reading apparatus, and is capable of avoiding a damage as well as a strength deterioration of an object material. The marking method comprises: preparing a marking object; converging, into the marking object, a laser beam having a wave length range so chosen that the laser beam can transmit through a material forming the marking object, and then effecting a multiple photon absorption; and moving a converging position of the laser beam, in a manner such that an area, whose refractive index is changed due to the multiple photon absorption, can form a diffraction pattern capable of diffracting a visible light.

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