Buckminsterfullerenes for optical limiters

Details Buckminsterfullerenes for optical limiters Buckminsterfullerenes for optical limiters

1991-10-24

1992-12-15

Moskowitz, Nelson

Optical: systems and elements

Absorption filter

359241, 359361, G02B 524, G02F 136, H01S 3113

Patent

active

051722780

ABSTRACT:
Optically sensitive materials (18) such as sensors or the human eye are passively protected against overexposure to high intensity light (20) in the visible region using a reverse saturable absorber (14) comprising one of a class of organic compounds known as buckminsterfullerene, such as C.sub.60. As the intensity of incident light increases, the intensity of transmitted light also increases up to a saturation level, but above the saturation level, the transmitted light intensity remains substantially constant even with increasing intensity of incident light. C.sub.60 has an unexpectedly low threshold for optical limiting action, is thermally stable, and is easily manufacturable into devices.

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