Optical: systems and elements – Optical modulator – Light wave directional modulation
Patent
1996-08-27
1998-06-16
Font, Frank G.
Optical: systems and elements
Optical modulator
Light wave directional modulation
359315, 359318, 359289, G02F 133
Patent
active
057680108
ABSTRACT:
The disclosed acousto-optic scanning device includes a thin film waveguide of piezoelectric material (2), a transducer (3) for generating surface elastic waves, and a high frequency signal generator (4) for generating high frequency signals to be applied to the transducer. Additionally, the device includes a light source (10), light source driver (11) for driving the light source, a prism or grating input and output light couplers (7, 8 or 27, 28) for introducing light emitted from the light source into the thin film waveguide and for outputting light transmitted through the thin film waveguide therefrom. Further, the device includes non-coupled light photodiode detector array (14) for detecting the position and intensity of light which is not coupled by the output light coupling means, and a signal processor for processing information detected by the non-coupled light detector array and generating control signals to correct the position and intensity of coupled light.
REFERENCES:
patent: 4696551 (1987-09-01), Amano et al.
patent: 4798449 (1989-01-01), Vichon et al.
patent: 5576880 (1996-11-01), Chang
Font Frank G.
Minolta Co. , Ltd.
Ratliff Reginald A.
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