TRANSPARENT MEDIA CAPABLE OF PHOTOINDUCED REFRACTIVE INDEX CHANGES AND THEIR APPLICATION TO LIGHT GUIDES AND THE LIKE

• US 3,809,686 A
• Filed: 03/01/1972
• Issued: 05/07/1974
• Est. Priority Date: 03/19/1970
• Status: Expired due to Term

• Current Assignee: Chandross E, Fork R, Kaminow I, Tomlinson W
• Original Assignee: Chandross E, Fork R, Kaminow I, Tomlinson W
• Inventors: CHANDROSS E, TOMLINSON W, FORK R, KAMINOW I
• Application Number:
  US05/230,714
• Time in Patent Office: 797 Days
• US Class Current: 522/60
• CPC Class Codes: G02B 6/02114 characterised by enhanced photosensitivity characteristics of the fibre, e.g. hydrogen loading, heat treatment treatment of glass fibres by ion diffusion, implantation, radiation, C03C25/60, C03C25/62
• CPC Class Codes: G02B 6/02123 characterised by the method of manufacture of the grating photolithography G03F7/0005
• CPC Class Codes: G02B 6/1221 made from organic materials
• CPC Class Codes: G02B 6/13 Integrated optical circuits characterised by the manufacturing method
• CPC Class Codes: G02B 6/138 by using polymerisation
• CPC Class Codes: G03F 7/038 Macromolecular compounds which are rendered insoluble or differentially wettable G03F7/075 takes precedence; macromolecular azides G03F7/012; macromolecular diazonium compounds G03F7/021

Abstract

THERE ARE DISCLOSED A VARIETY OF METHODS FOR PRODUCING LIGHT GUIDES INSUITABLE SENSITIZED SAMPLES UPON IRRADIATION WITH FOCUSED ULTRAVIOLET LIGHT AND SUBSEQUENT AGING. THESE METHODS ARE BASED UPON THE RECOVERY THAT ULTRAVIOLET RADIATION FROM A MERCURY ARC AT 3650 A. OR FROM AN ULTRAVIOLET HELIUM-CADMIUM ION LASER AT 3250 A. PRODUCES READILY OBSERVABLE IRREVVERSIBLE INDEX OF REFRACTION CHANGES IN POLY(METHYL METHACRYLATE) POLYMERIZED AT LOW TEMPERATURES OF AROUND 40-50 DEGRESS CENTIGRADE. UPON SUBSEQUENT AGING THE AMOUNT AND GRADIENT OF THE INDEX CHANGE SUBSTANTIALLY INCREASE.

Claims