Method and apparatus for controlling photointensity and/or luminous flux density of a signal light


Ontology type: sgo:Patent     


Patent Info

DATE

2001-07-24T00:00

AUTHORS

Norio Tanaka , Shigeru Takarada , Hiromitsu Yanagimoto , Masakatsu Kai , Ichiro Ueno

ABSTRACT

The present invention provides a method of controlling light and an apparatus of controlling light capable of extracting sufficiently large and speedy optical responses from the photoresponsive photoelement with a high reproducibility, wherein the control light is emitted from the light source 1, and the signal light from the light source 2. The control light and signal light are converged by the converging lens 7, and illuminated to the film photoelement 8 filled in with the photoresponsive composition. Via the collimate lens 9 and the band-pass filter 20, only the signal light is detected with the photodetector 22. By turning the control light on and off, the transmittance and/or refractive index of the signal light are reversibly increased or decreased, realizing the modulation of photointencity. By setting the numerical aperture of the collimate lens at the value essentially smaller than the numerical aperture of the collimate lens, sufficiently large and speedy optical responses can be extracted from the photoelement comprised of photoresponsive composition containing dye. More... »

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