Tantala-silica interference filters and lamps using same

Details Tantala-silica interference filters and lamps using same Tantala-silica interference filters and lamps using same

1988-11-14

1990-08-14

Wieder, Kenneth

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Polarizer or special ray transmission

313315, 427 10, 427107, 350 17, 350166, 428432, H01J 920, H01K 132

Patent

active

049490052

ABSTRACT:
Thin film interference filters consisting of alternating layers of tantala and silica suitable for high temperature use on electric lamps have been made by heat treating at 550.degree.-675.degree. C. before using the filters at high temperature. Tungsten halogen lamps made with such heat treated filters have been thermally cycled for thousands of cycles at 900.degree. C. with no film loss and with satisfactory optical performance.

REFERENCES:
patent: 4048347 (1977-09-01), Schrank et al.
patent: 4588923 (1986-05-01), Hoegler et al.
patent: 4663557 (1987-05-01), Martin, Jr. et al.
patent: 4689519 (1987-08-01), Ooms et al.
patent: 4701663 (1987-10-01), Kawakatsu et al.
patent: 4734614 (1988-03-01), Kuus
patent: 4769290 (1988-09-01), Hettich et al.
patent: 4775203 (1988-10-01), Vakil et al.

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