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We report the realization, in titanium‐diffused lithium niobate, of an integrated optical switch/modulator consisting of an active directional coupler with a novel electrode configuration. Efficient switching is observed with 6 V applied.
We report the observation of saturation of impurity photoconductivity in semiconducting n ‐GaAs illuminated by a Q ‐switched Nd:YAG laser with light intensity up to 3.5 MW/cm 2 . From the saturation of conductivity we determined the concentration of defects to be ≈10 16 cm −3 . These form...
The absence of C‐H bonds in aprotic and particularly in molecular liquids possessing a wide liquid range enhances the probability of observing α processes in these liquids. Evidence for electron multiplication and breakdown in the liquid phase of sulfur is presented. Current‐voltage...
Measurements have been made of the current flow in amorphous WO 3 films containing electrons and mobile cations. In a configuration in which electrons are extracted at one contact and cations at the other, the current decays as t −3/4 over many decades of time. By using space‐charge current...
Tetrachloro–μ‐hydroxo–μ‐carboxylatodichromium (III) complexes have been used to induce homeotropic alignment of nematic, smectic, and large‐pitch cholesteric liquid crystals. A dynamic scattering degradation test has shown that this orientation is remarkably stable.
A new system for the direct video display of x‐ray diffraction topographs is described. The pattern is converted to an optical signal by a fine‐grain fluorescent screen, which is viewed by a video camera through a magnifying optical system. We have achieved a resolution of about 10 μm,...
With the time‐of‐flight technique we have measured the longitudinal diffusion coefficient of electrons in silicon at 300 K for fields from Ohmic up to 50 kV/cm. The results have been interpreted by means of Monte Carlo calculations with a theoretical model which includes the many‐valley...
A flashlamp‐pumped dye laser, operating with a 55‐nsec (FWHM) pulsed output, has been used in conjunction with a 90° phase‐matched nonlinear optical crystal (ADA) to generate tunable radiation in the 290–300‐nm region at power levels greater than 1 kW.
Images from the acoustic microscope can be recorded with increased clarity and additional detail if one uses an ’’off‐axis’’ arrangement wherein the axis of the output lens is tilted with respect to the input lens. Also, stereograms have been recorded by canting the plane of the object....
Void formation during electromigration has been observed near the anode edge of a Cu‐Al zone in an Al stripe. Growth of new voids was continuous with a void front propagating along the electron flow direction at a nonlinear rate. Such motion of the void front can be quantitatively correlated to...
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