Accession Number : ADB160617

Title :   Rugate Laser Filter. Phase 1.

Descriptive Note : Final rept. 15 Aug 88-15 Feb 89,

Corporate Author : BROWN (JOHN A) ASSOCIATES INC BERKELEY HEIGHTS NJ

Personal Author(s) : Brown, John A.

Report Date : 15 FEB 1989

Pagination or Media Count : 34

Abstract : There is a growing need to provide eye protection to military personnel at risk from laser beams, and rugate interference filters have great promise as protective devices. This program explored a new approach to rugates: fabricating them from thin films of cross-linked organic polymers of two different refractive indices, blended at the interfaces so as to result in a smooth transition from one refractive index to the other. Such a structure is a tough, flexible, monolithic sheet of plastic, with no planes of weakness for water attack or delamination. Fabrication could be done on web-coating machinery akin to printing presses. This program developed a high-refractive-index (1.59) acrylic and demonstrated its deposition in thin films onto glass substrates. It also demonstrated the fabrication of an elementary optical interference filter - in laboratory glassware - with that acrylic. Suitable cross-linkable low-refractive-index (1.50-1.54) acrylics are commercially available. The initial application of organic rugate filters is military eye protection, but their inherent ruggedness and potential low cost make them attractive for many other light filtering applications ranging from scientific instruments to decorative purposes. Commercial production is planned after military needs are met.

Descriptors :   *LASERS, ACRYLIC RESINS, ATTACK, COMMERCE, CROSSLINKING(CHEMISTRY), DEPOSITION, EYE, FLEXIBLE MATERIALS, GLASS, GRATINGS(SPECTRA), INSTRUMENTATION, INTERFERENCE, LABORATORIES, LASER BEAMS, LOW COSTS, MILITARY PERSONNEL, MILITARY REQUIREMENTS, MONOLITHIC STRUCTURES(ELECTRONICS), OPTICAL FILTERS, ORGANIC COMPOUNDS, POLYMERS, PRESSES(MACHINERY), PRINTING, PRODUCTION, PROTECTION, REFRACTIVE INDEX, RISK, RUGGEDIZED EQUIPMENT, SHEETS, SUBSTRATES, THIN FILMS, TOUGHNESS, TRANSITIONS, WATER.

Subject Categories : Safety Engineering
      Lasers and Masers
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE