Methods for creating optical structures in dielectrics using...

Electric heating – Metal heating – By arc

Reexamination Certificate

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C219S121750

Reexamination Certificate

active

06884960

ABSTRACT:
The present invention relates to a method for writing an optical structure within a workpiece of a dielectric material using FLDM. In a first embodiment system parameters for the FLDM are determined in dependence upon the dielectric material, a predetermined volume element and a predetermined change of the refractive index of the dielectric material within the predetermined volume element. The system parameters are determined such that self-focusing of a pulsed femtosecond laser beam is inhibted by non-linear absorption of the energy of the pulsed femtosecond laser beam within the dielectric material. A pulsed femtosecond laser beam based on the determined system parameters is focused at a predetermined location within the workpiece for inducing a change of the refractive index through dielectric modification within the predetermined volume element, the volume element including the focus. Various embodiments enable writing of various different optical structures into a workpiece.

REFERENCES:
patent: 6642480 (2003-11-01), Amako et al.
patent: 6710901 (2004-03-01), Pastor
patent: WO 0109899 (2001-02-01), None
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