COMPOSITE SUBSTRATE FOR ELECTRO-OPTICAL ELEMENT AND PRODUCTION METHOD THEREFOR

Title:

COMPOSITE SUBSTRATE FOR ELECTRO-OPTICAL ELEMENT AND PRODUCTION METHOD THEREFOR

Document Type and Number:

WIPO Patent Application WO/2020/095478

Kind Code:

A1

Abstract:

Disclosed is a composite substrate for an electro-optical element. This composite substrate is provided with: an electro-optical crystal substrate having an electro-optical effect; a low-refractive-index layer which abuts the electro-optical crystal substrate and has a lower refractive index than the electro-optical crystal substrate; and a support substrate which is bonded, at least via a bonding layer, to the low-refractive-index layer. In the composite substrate, at least one of a plurality of interfaces present between the low-refractive-index layer and the support substrate has a surface roughness greater than that of an interface between the electro-optical crystal substrate and the low-refractive-index layer.

Inventors:

UNO YUDAI (JP)
TAI TOMOYOSHI (JP)
KONDO JUNGO (JP)

Application Number:

PCT/JP2019/027570

Publication Date:

May 14, 2020

Filing Date:

July 11, 2019

Export Citation:

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Assignee:

NGK INSULATORS LTD (JP)

International Classes:

G02B6/12; G02F1/03; G02F1/035

Foreign References:

JP2006284963A	2006-10-19
JP2007264548A	2007-10-11
JP2004145261A	2004-05-20
JP2018093329A	2018-06-14
JPH09211404A	1997-08-15
JP2000275455A	2000-10-06
JP2016191823A	2016-11-10
US20070297732A1	2007-12-27
JP2010085789A	2010-04-15

Other References: