Method and apparatus for obtaining modulated light indicative of an image operationally formed by projecting an inputted image on the flat plate of an optical induction reflective index crystal

DETAILED DESCRIPTION An object of the present invention is to provide an optical logic operation apparatus which is easy to fabricate and is reliable in executing the even with a low-intensity light used for the image projection by making a further improvement of the conventional apparatus using the above-mentioned optical induction index crystal, and to provide an a logic operation method using the above apparatus.
The above-mentioned object of the present invention can be achieved by providing an optical logic operation apparatus comprising: an optical induction refractive index crystal having first and second planes parallel to each other; means for inputting a coherent probe light from the first plane of the aforesaid crystal; means for taking out at least one of the first light output from the first plane of the aforesaid crystal and the second light output from the second plane thereof,, wherein one of the first and second lights is amplified by the two-wave coupling of the probe light reflected by the second plane and the probe, light inputted from the first plane, and the other is attenuated likewise by the two-wave coupling; and means for projecting the inputted image onto the crystal by using an incoherent light to the probe light, and with the incidence of this incoherent light, the gain distribution corresponding to the inputted image being generated in the crystal to modulate the aforesaid first and second lights spatially.
Also, a method for obtaining a modulated light showing the image operated by the above-mentioned apparatus comprises the steps of: inputting a coherent probe light from the first plane of the aforesaid crystal; taking out at least one of the first light output from the first plane of the aforesaid crystal and the second light output from the second plane thereof, wherein one of the first second lights is amplified by the two-wave coupling of the prove light reflected by the second plane and the probe light inputted from the first plane, and the other being attenuated likewise by the two-wave coupling; and projecting the inputted image onto the crystal by using an incoherent light against the probe light, and with the incidence of this incoherent light, the gain distribution corresponding to the inputted image being generated in the crystal to modulate the aforesaid first and second light spatially