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1. (WO2018182946) BEAM MULTIPLEXER FOR WRITING REFRACTIVE INDEX CHANGES IN OPTICAL MATERIALS

Pub. No.:    WO/2018/182946    International Application No.:    PCT/US2018/021601
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Fri Mar 09 00:59:59 CET 2018
IPC: A61F 9/008
B23K 26/00
B23K 26/067
B23K 26/082
Applicants: UNIVERSITY OF ROCHESTER
Inventors: KNOX, Wayne H.
Title: BEAM MULTIPLEXER FOR WRITING REFRACTIVE INDEX CHANGES IN OPTICAL MATERIALS
Abstract:
A refractive index writing system includes a pulsed laser source, an objective lens for focusing an output of the pulsed laser source to a focal spot in an optical material, and a scanner for relatively moving the focal spot with respect to the optical material along a scan region. A beam multiplexer divides the output of the laser source into at least two working beams that are focused to variously shaped focal spots within the optical material. A controller controls at least one of a temporal and a spatial offset between the focal spots of the working beams together with the relative speed and direction of the scanner for maintaining an energy profile within the optical material along the scan region above a nonlinear absorption threshold of the optical material and below a breakdown threshold of the optical materials.