Gigahertz planar photoconducting antenna activated by picosecond optical pulses.

We have generated 1-20-GHz microwave pulses by illuminating an Fe-compensated InP wafer with 50-ps optical pulses at normal incidence. The process of the generation of microwave radiation was monitored and analyzed directly through a 40-GHz sampling oscilloscope with precision. The saturation properties, the waveform evolution, and the optical coupling efficiency of the gigahertz photoconducting antenna are discussed.

Propagation of transverse bulk and surface acoustic waves in LiNbO (3) variable time-delay devices.

Experimental measurements are reported on voltage-controlled acoustic time-delay lines operating at 1 GHz in the nearly pure shear-horizontal (S-H) mode in 38 degrees rotated Y-cut LiNbO(3). The high-acoustic velocity (4800 m/s) in conjunction with the large electroacoustic effect exhibited by this orientation allows high-frequency operation and optimum time-delay tuning sensitivity with a planar, single surface, device geometry. The authors demonstrate fractional time delay of 0.

Unique Properties of SBN and Their Use in a Layered Optical Memory.

Holographic storage experiments using crystal Sr(0.75)Ba(0.25)Nb(2)O(6) (SBN 75/25) as a volume-phase holographic medium show that this material is the most sensitive crystalline storage medium yet discovered.

Light beam deflection using holographic scanning techniques.

Holographic techniques provide a mechanically simple method for deflecting light beams through two-and three-dimensional scan patterns. One technique for producing a two-dimensional raster scan through the use of a one-dimensional circular motion is described in detail. To illustrate the feasibility of such devices, a two-dimensional holographic scanner has been fabricated and used to construct a simple closed-circuit television system.