Optical device

Details Optical device Optical device

1993-04-07

1995-04-11

Ben, Loha

Optical: systems and elements

Absorption filter

359888, 359578, 359583, 359589, 25022723, G02B 522

Patent

active

054064201

ABSTRACT:
An optical controlling device has a light transmitting medium showing a low transmittance for specific light wavelength .lambda..sub.1 and a high transmittance for light wavelength .lambda..sub.2 around the light wavelength .lambda..sub.1, and a light emitting device emitting a light of light wavelength .lambda..sub.1 or .lambda..sub.2, and controls light intensity in accordance with changes in a controlled light through light irradiation and light transmission. An optical functional device has a light transmitting medium showing a low transmittance for specific light wavelength .lambda..sub.1 and a high transmittance for light wavelengths .lambda..sub.2 and .lambda..sub.3 around the wavelength .lambda..sub.1 (.lambda..sub.2 <.lambda..sub.1 <.lambda..sub.3), and a light emitting device changing wavelength while accompanying a generation of hysteresis dependent upon the quantity of current injection or light irradiation, and emitting a light having light wavelength .lambda..sub.1, .lambda..sub.2 or .lambda..sub.3. A light intensity transmitting through the light transmitting medium is maintained at a low-intensity or high-intensity state under the effect of the hysteresis, thereby a memory function is obtained.

REFERENCES:
patent: 4590374 (1986-05-01), Brewster
patent: 4874223 (1989-10-01), O'Meara
patent: 4962503 (1990-10-01), Liu et al.
patent: 4962995 (1990-10-01), Andrews et al.
patent: 4995046 (1991-02-01), Fan et al.

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