Abstract:
A mask structure for use in an x-ray lithographic system comprises as the substrate thereof a Mylar film stretched over and bonded to a support ring. The stretched Mylar film exhibits an attractive combination of advantageous properties such as high planarity, dimensional stability, mechanical strength, low x-ray absorption, resistance to organic solvents, optical transparency, and ready availability in a variety of thicknesses with optical quality surfaces.
Abstract:
A fine grain, ferroelectric ceramic parallel plate, such as lanthanum doped, lead zirconate-lead titanate, is subjected to a constant and uniform stress along a first direction in the plane of the plate. By means of a photoconductive layer and a pair of transparent electrode layers, the ferroelectric plate under stress can be subjected to selective WRITE-IN of a pattern of information using an optical WRITE-IN beam of light, as well as a selective ERASE of such information, all under the control of electric fields only in the normal direction to the plane of the ferroelectric plate produced by D.C. voltages applied to the electrode layers.
Abstract:
A polycrystalline electrooptic plate, such as a fine grain ferroelectric ceramic plane parallel plate, is subjected to a constant (in time) and uniform (in space) tensile stress along an axis of tension in the plane of the plate. A pair of electrode layers on a major surface of the plate define a gap in the plate, the gap running along a direction at an oblique angle with respect to the axis of tension. Control voltage pulses are applied across these electrodes to produce electric fields in the plane of the plate across the gap, thereby producing a controllable birefringence in the plate with respect to optical radiation propagating normal to the plate in the gap. By locating this place between an optical polarizer and analyzer, an optical switch (''''light gate'''') can be formed with simple electrical access to the electrode layers.
Abstract:
A controllable optical phase retardation device includes a fine grain electrooptic ceramic plate, such as lanthanum doped lead zirconate-lead titanate. The plate is subjected to a constant and uniform strain with a tension axis in the plane of the plate, while a beam of optical radiation traverses the thickness of the plate. By applying voltages to a pair of transparent electrode layers located on opposed major surfaces of the plate, the degree of birefringence is controlled, that is, the relative optical phase retardation of the extraordinary and ordinary rays in the optical beam propagating through the plate is controllably varied by the electric fields perpendicular to the surfaces of the plate. This control over the phase retardation can be converted into optical intensity modulation or optical beam deflection by means of a conventional polarizer together with an optical analyzer or a doubly refracting prism.