Abstract: A system is provided for delivering a high-power laser beam through a fiber optic cable to a metal workpiece for drilling, cutting or welding the workpiece. The laser beam is focused onto a first end of the fiber optic cable, with a gas being applied to the first end of the cable as a cooling agent. The gas is transmitted coaxially with the fiber optic cable along the length thereof. The laser beam emerges from a second end of the fiber optic cable and is received and focused onto a workpiece by a beam delivery assembly. The transmitted gas is applied to the second end of the fiber optic cable as a cooling agent and injected onto the workpiece coaxially with the focused laser beam. With such arrangement, a laser beam is delivered to a workpiece for processing the workpiece via a flexible system, allowing the beam to be dexterously maneuvered about the workpiece.

Abstract: A digital-to-analog conversion circuitry is provided wherein a switching network is adapted to couple, or decouple, a selected one, or ones, of a plurality of identical current sources to, or from, an output bus selectively in accordance with the digital word being converted to produce an output current through an output bus having a level related to such digital word.

Abstract: An apparatus for digitally storing samples of a received signal having a carrier frequency component and an angle modulation component and for subsequently reconstructing such received signal from the stored samples. The system includes a pair of digital memory systems, a first one storing samples of a signal fed thereto at a relatively high rate, and a second one storing samples of a signal fed thereto at a relatively low rate. The received signal is coupled to the first memory system for a relatively short period of time for storing therein samples representative of the carrier frequency component. The received signal is also coupled to the second memory system for a relatively long period of time for storing therein samples representative of the angle modulation component.

Abstract: A laser gyroscope is described having a ring resonator adapted to support a plurality of resonant transverse electric and magnetic field modes TEM.sub.qmn, wherein the longitudinal mode index q is a sequentially different integer for each mode and the transverse mode indices m and n are constant. The gain medium bandwidth is sufficient to simultaneously support at least two adjacent modes, such as TEM.sub.qmn and TEM.sub.(q+1)mn modes. Each mode is split into a set of four components having distinct frequencies, arranged in orthogonally polarized pairs, typically counter-propagating right-handed and left-handed circularly polarized. At least six components can resonate, arranged in three pairs of alternating polarization, two of the pairs from a first mode, for example TEM.sub.qmn, and the third pair formed from the first two components from a second mode, for example TEM.sub.

Abstract: A memory integrated circuit component comprises: a memory; addressing circuitry for the memory; and, power switch circuit, programmable to either: (a) electrically couple or decouple the addressing circuitry and a power supply selectively in accordance with an enable signal; or, (b) maintain the addressing circuitry electrically coupled to the power supply independent of the enable signal.With such arrangement, an integrated circuit component manufacturer avoids having to produce two separate types of non-volatile integrated circuit memories (i.e., a power switched component and a non-power switched component), but rather such manufacturer is able to fabricate a common non-volatile integrated circuit memory component which may be programmed after fabrication by either the user or the manufacturer as either a non-power switched memory component or a power switched memory component.

Abstract: A frequency correction apparatus having a delay line fed by an input signal, the frequency of such signal being corrected a predetermined amount, .DELTA.f. The delay line has a plurality of output taps regularly disposed along the line. The output taps produce a plurality of successively time-delayed signals each one having the frequency of the input signal. A switching network is included for successively coupling each one of the plurality of time-delayed signals to an output terminal of a predetermined coupling change rate related to .DELTA.f, to produce, at such output terminal, an output signal having a frequency shifted from the frequency of the input signal the predetermined amount required for the desired frequency correction. When the taps are successively coupled to the output terminal in a direction along the delay line away from the input to such line, the frequency of the output signal is equal to the frequency of the input shift shifted lower in frequency the amount .DELTA.f.

Abstract: A semiconductor structure is provided by forming an isolation region in a portion of a semiconductor layer, forming a doped region in the semiconductor layer adjacent the isolation region, such doped region having a conductivity type opposite the conductivity type of the semiconductor layer, selectively masking a surface of the semiconductor layer exposing a portion of the doped region adjacent to the isolation region, and selectively etching the exposed portions of the adjacent doped region forming a depression having converging side walls separated from the isolation region by portions of the doped region. The semiconductor layer is an epitaxial layer providing the collector region of a transistor. The bottom portion of the depression is lightly doped to provide an active base region for the transistor. The active base region is electrically connected to the base contact through the more heavily doped region formed in the semiconductor layer.

Abstract: A radio frequency antenna is provided comprising: a waveguide section; first means for establishing radio frequency energy in such waveguide section having a first linear polarization with an electric field disposed normal to opposing wide walls of the waveguide section; a planar microwave circuit means, for establishing a second linear polarization having an electric field disposed perpendicular to the electric field of the first linear polarization, such microwave circuit means being disposed within the waveguide between the wide walls and relative to the feed means to provide the first linear polarization and the second linear polarization with substantially coincident phase centers. In a preferred embodiment of the invention, the microwave circuit means includes a strip conductor feed separated from a ground plane conductor by a dielectric, such ground plane conductor having a notch formed therein and fed by the strip conductor.

Abstract: A radio frequency antenna element is provided comprising a waveguide having disposed within and adjacent to a rearward portion of such waveguide a ridge, such ridge having a relatively narrow forward portion and a plurality of feeds, disposed within the waveguide, for coupling energy from a plurality of sources to a relatively wider, rearward portion of the ridge. The waveguide has a pair of opposing, relatively wide upper and lower walls and a pair of opposing, relatively narrow side walls. The relatively wider, rearward portion of the ridge tapers to the narrower forward portion of the ridge in a plane parallel to the upper and lower walls of the waveguide. The narrow portion of the ridge tapers towards one of the wider walls as such ridge extends from the rearward portion of the waveguide to the forward portion of the waveguide.

Abstract: A shift register comprising a plurality of memory cells serially coupled together along a signal bus. Each one of the plurality of memory cells comprises a first amplifier, fed by an input logic signal, for amplifying and inverting the logic state of the input logic signal. A first storage section is included for either enabling storage in the first storage section of an electric charge corresponding to the voltage level of the amplified and inverted input logic signal, or disabling storage in the first storage section of the electric charge, selectively in response to a first control signal. The stored electric charge is converted to an intermediate logic signal having a predetermined voltage level. Each memory cell additionally includes a second amplifier, fed by the intermediate logic signal, for amplifying and inverting the logic state of the intermediate logic signal.

Abstract: A microwave transistor package is provided having a thermal and electrical conductive refractory type substrate. A ground plane plate is provided, such plate having an open-ended compartment therein, the open end of such compartment being disposed adjacent an upper surface portion of the ground plane plate. A bottom surface of such plate is disposed on an upper, inner surface region of the substrate. The thermal coefficient of expansion of the ground plane plate is substantially greater than the thermal coefficient of expansion of the substrate. An electrical insulator is disposed within the compartment, such insulator having a relatively high thermal transfer characteristic and having upper and lower conductive layers with side wall portions disposed adjacent side wall portions of the compartment.

Abstract: An improved monopulse radar system wherein target return signals received by a plurality of antenna elements are corrected with correction signals derived within the system in response to pilot pulses. The improvement comprises a plurality of receiver channels, each receiver channel being coupled to a single one of the plurality of antenna elements. The improvement also comprises means for generating a first set of quadrature components of video signals developed in the plurality of receiver channels in response to the pilot pulses received by the plurality of antenna elements, and for generating a second set of quadrature components of video signals developed in the plurality of receiver channels in response to return signals from the target received by the plurality of antenna elements. Digital signals representative of the first and second sets of quadrature components of video signals are generated.

Abstract: A subsurface Zener diode is provided wherein a semiconductor has formed thereon spaced apart anode and cathode regions of opposite type conductivity, such regions having opposing surface portions, and disposed beneath a surface of such semiconductor a buried region of conductivity type the same as one of such regions, such buried region extending laterally through the spaced apart regions, one of the spaced apart regions having an opposing surface portion thereof formed with a portion which protrudes towards the opposing surface portion of the other one of the spaced apart regions. With such arrangement, an electric field produced between the spaced apart regions becomes concentrated at the protrusion with the result that Zener breakdown occurs repeatedly at the same point in the semiconductor thereby reducing long term drift. Also, a Kelvin buried Zener diode is provided by forming a second laterally spaced anode region with the cathode region disposed between the pair of anode regions.

Abstract: An interferometer wherein detected local oscillator beam power is variable without varying detected target-reflected return beam power. A P-polarized beam of energy is produced along a predetermined path. First and second waveplates are serially disposed in the predetermined path. Also included are a beamsplitter disposed in the path between the first and second waveplates, and a polarization analyzer disposed in the path between the beam producing means and the first waveplate. A first portion of the P-polarized beam couples through the first waveplate, the beamsplitter and the second waveplate, and is transmitted to a target, the first and second waveplates altering the polarization of the transmitted beam to circular polarization.

Abstract: A radio frequency antenna system is provided comprising: a radio frequency lens having a parallel plate region and having disposed along opposing peripheral portions thereof a plurality of array ports and a plurality of beam ports, such array ports being coupled to an array of antenna elements arranged to provide a plurality of differently, directed relatively narrow collimated beams of radio frequency energy from a common aperture, each one of such beams being associated with a corresponding one of the plurality of beam ports; and, means for coupling radio frequency energy directly into the parallel plate region to provide, from the common aperture, a relatively broad beam of radio frequency energy.In a preferred embodiment of the invention, a plurality of amplifiers is provided, each one of the amplifiers being coupled between an array port and a corresponding one of the antenna elements.

Abstract: An integrated circuit comprising a plurality of gain cells interspersed with a plurality of passive and active, electrically isolated components (e.g. thin-film binarily-weighted resistors and transistors). Each gain cell comprises a differential amplifier gain stage comprising a pair of emitter-coupled transistors, the coupled emitters being connected to a current source. The collectors thereof are coupled to a pair of transistors configured as a current mirror. The emitter-coupled transistors, current source and current-mirror transistors are disposed on a first level of the integrated circuit. A first output stage comprising a common-emitter transistor and a second output stage comprising a transistor having an electrically isolated emitter are disposed on the first level.