04931077 is referenced by 9 patents and cites 3 patents.

Grooves are etched in a glass substrate, using a metallic mask, after which the substrate is coated with a layer of glass having a refractive index which is higher than that of the substrate, the groove being filled completely. Excess glass is removed, the metallic mask being used as a stop layer and a protective layer being provided at the location of the filled grooves. Excess glass is removed at the location of the grooves by means of polishing so that a high accuracy as regards depth can be obtained.

Title
Method of manufacturing a planar optical component
Application Number
7/210058
Publication Number
4931077
Application Date
June 22, 1988
Publication Date
June 5, 1990
Inventor
Gijsbertus A C M Spierings
Eindhoven
NL
Maritza G J Heijman
Eindhoven
NL
Johannes H Angenent
Paris
FR
Agent
William L Botjer
Assignee
U S Philips
NY, US
IPC
C03C 17/245
C03C 15/00
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