JPH06167732A - Optical logic gate - Google Patents

Abstract

PURPOSE:To provide an optical logic gate which can make high-speed response at nanosecond order and operates distinctly. CONSTITUTION:This optical logic gate has a saturable dyestuff absorption layer 6 which is operated by a laser beam of a level above a saturation point and does not operate at a level hollow said points, a laser beam synthesizing means 5 which is disposed to synthesize the laser beams from two directions and direct the synthesized laser beam toward this saturable dyestuff absorption layer 6, two space modulating means 3, 4 which are provided to face the two directions of the laser beam synthesizing means 5 and make space modulation of the laser beams and input means 1, 2 for making the two laser beams synthesized by the laser beam synthesizing means 5 and the level of which at the time of incidence on the saturable dyestuff absorption layer 6 is >=65kW and below the saturation point to the saturable dyestuff absorption layer 6 incident on the two space modulating means 3, 4.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to optical logic gates.

[0002]

2. Description of the Related Art Conventionally, a method of using a spatial modulation recorder using a light guide and a liquid crystal, such as a liquid crystal light valve logic gate devised by the present inventor, has been used for an engineering logic gate of this type, or a NASA optical computer. , N
OVA system is known, but all are NAN
The feasibility of optical logic operation by realizing the D gate has been examined.

[0003]

The above-mentioned conventional optical logic gates combine a photoconductive conductor active with respect to light and a passive optical element such as a liquid crystal. Only the element has been put to practical use. If the response and the input read timing are deviated as shown in FIG. 2, β and γ are obtained in addition to the required logical output α.
However, it is difficult to discriminate them.

Accordingly, the present invention seeks to provide a logic gate which is capable of high speed response on the order of nanoseconds and which operates in a very clear manner.

[0005]

The present invention uses a saturable dye absorber, such as copper-phthalocyanine or rhodamine B, which is known as a Q-switch element of a laser, and does not output at an input level below a threshold value and has a clear binary value. The object of the present invention is to provide an optical logic gate that does not have the above-mentioned drawbacks by applying a material that can be converted into a logic gate.

That is, according to the present invention, the saturable dye absorbing layer that operates with a laser beam at a level above the saturation point and does not operate at a level below that and a laser beam from two directions are combined to form the saturable dye absorption layer. Laser beam synthesizing means arranged so as to face the dye absorbing layer, two spatial modulation means for spatially modulating the laser beam, which are provided so as to face the two directions of the laser beam synthesizing means, and 2 The level when the light is synthesized by the laser beam synthesizing means and is incident on the saturable dye absorbing layer is at least 6 in one spatial modulating means.
An optical logic gate having a peak power of 5 kW and an input means for injecting two laser beams which are below the saturation point with respect to the saturated dye absorbing layer is obtained.

In the optical logic gate of the present invention, if the threshold value for the saturable dye absorber is a logically negative level, and the level exceeding the threshold value is interpreted as a positive level, the negative value is obtained for the dye absorber. A laser beam active at a level is defined as an active carrier (that is, a light at a logic-realizable level) for performing logic. This active carrier is a trigger beam that opens the gate for implementing the logic. Although the type of laser beam may be practically any wavelength characteristic, a high-output laser beam capable of exhibiting saturable characteristics is required as an input beam. However, it is not always necessary to satisfy this condition when reading.

[0008]

1 is a sectional view of an embodiment of the present invention, in which 1
Is a laser beam as the first input information (referred to as a first input beam), and 2 is a laser beam (second input beam) as the second input information. Reference numerals 3 and 4 are first and second spatial modulation elements such as a liquid crystal light valve, PLZT, BSO, etc., through which the first and second input beams pass, respectively. 5 is a laser beam synthesizing unit, which is the first
And the second input beam are combined in the same space at the same time. Reference numeral 6 denotes a saturable dye absorption layer, which has a negative logic "0" at a synthetic input level below a threshold value and a peak output of 65 kW or more, and has a positive logic "1" at a synthetic input level above the threshold value. An output beam 7 is obtained.

The logic gate of FIG. 1 can act as an AND gate, and since the gate itself is active, no unnecessary logic output is generated even if there is a timing difference between the first and second input beams.

[0010]

As described above in detail, according to the present invention, the binary value of the saturable dye absorbing layer is set to the level of logically transparent and opaque.
By reading at the so-called second harmonic level, which is realized by digitizing and easily obtains the light transmission and the light non-transmission at the inversion level with respect to the dye, that is, at the input level below the threshold value. When it is inactive and exceeds the threshold value, a logical "1" is read and given to the beam.
By obtaining the gate, it became possible to construct a logic gate with a nanosecond-order fast response of the saturable dye absorbing layer.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a first embodiment of the present invention.

FIG. 2 is a diagram showing that an unnecessary calculation output is generated when there is a difference in responsiveness and input read timing in the conventional device.

[Explanation of symbols]

 1 First Input Beam 2 Second Input Beam 3 First Spatial Modulator 4 Second Spatial Modulator 5 Laser Beam Synthesizer 6 Saturable Dye Absorption Layer 7 Output Beam

Claims (1)

[Claims] 1. A saturable dye absorbing layer that operates with a laser beam at a level above the saturation point and does not operate at a level below that,
Laser beam synthesizing means arranged so as to synthesize laser beams from two directions to face the saturable dye absorbing layer, and a laser provided to face the two directions of the laser beam synthesizing means. Two spatial modulation means for spatially modulating the beam and a peak output of at least 65 kW when combined with the two spatial modulation means by the laser beam combining means and incident on the saturable dye absorbing layer. And an input means for injecting two laser beams having a saturation point or less with respect to the saturable dye absorbing layer.