Abstract: A Polarization-Sensitive Shear Wave Transducer Structure utilizes a 4 part MuSLE electrode formed on a top surface of a dilithium tetraborate (Li.sub.2 B.sub.4 O.sub.7) substrate that acts as a transducer forming a body. Electrode gaps of the MuSLE electrode are aligned along the X.sub.1 ' and X.sub.3 ' axes of the dilithium tetraborate substrate. The substrate orientation is chosen along the degeneracy locus occurring in the primitive region between the end points (YXl) 19.degree. and (YXw) 27.degree.. The body is bonded to a test object and segments of the MuSLE electrode are coupled to a power source allowing an excitation voltage to create a lateral-field driving a shear wave of selectable polarization. The segments of the MuSLE electrode can also be coupled to a means for detecting a voltage allowing a shear wave incident on the transducer to be detected.

Abstract: A piezoelectric resonator for use with microwave monolithic integrated ciit (MMIC) devices which are fabricated on (100) GaAs (gallium arsenide) material is provided. This resonator has a central resonator flat portion composed of (100) GaAs material and has a distributed reflector on each side of the flat portion with each reflector having an alternating series of layers, including a first layer having doped regions and an uppermost layer composed of the (100) GaAs material.

Abstract: A crystal resonator including at least three, typically four linear electe segments, formed on one of the major faces of piezoelectric resonator blank and providing at least two gaps which are selectively excited by RF voltages of predetermined magnitude and phase for generating a resultant lateral-field oriented at an arbitrary angle .PSI. with respect to the coordinate axes of the crystal plate for varying the lateral-field piezoelectric coupling k which is a parameter indicative of the degree to which an electrical energy is converted to mechanical energy in the resonator. By adjusting the magnitude and phases of the excitation voltages, applied to the electrode segments, the lateral-field direction becomes steerable so as to alter the electrical characteristics of the resonator including the lateral-field excitation antiresonance frequency.

Abstract: A Polarization-Sensitive Shear Wave Transducer Structure utilizes a 4 part MuSLE electrode formed on a top surface of a dilithium tetraborate (Li.sub.2 B.sub.4 O.sub.7) substrate that acts as a transducer forming a body. Electrode gaps of the MuSLE electrode are aligned along the X.sub.1 ' and X.sub.3 ' axes of the dilithium tetraborate substrate. The substrate orientation is chosen along the degeneracy locus occurring in the primitive region between the end points (YXl) 19.degree. and (YXw) 27.degree.. The body is bonded to a test object and segments of the MuSLE electrode are coupled to a power source allowing an excitation voltage to create a lateral-field driving a shear wave of selectable polarization. The segments of the MuSLE electrode can also be coupled to a means for detecting a voltage allowing a shear wave incident on the transducer to be detected.

Abstract: The present invention is a spatial light modulator which uses an uniaxially trained multiple quantum well (MQW) structure with an anisotropic absorption to rotate the polarization of light normal to the MQW structure. The anisotropy which produces this rotation is the result of a thermally induced in-plane anisotropic strain. The MQW light modulator based on this process has a high contrast ratio of 7000:1 and increased speed as compared to other similar modulators.

Abstract: Biasing electrodes on a piezoelectric acoustic vibrator alter the sensitivity of the acoustic vibrator and can be used to compensate for external stresses applied to the acoustic vibrator. The biasing electrodes and the circuitry providing electric signals to them are separate from the RF circuitry feeding the RF signal electrodes of the acoustic vibrator. Biasing electrodes can be used on bulk acoustic wave devices or surface acoustic wave devices. The biasing electrodes can be energized by a static D.C. voltage source, or can be used in a dynamic biasing arrangement to provide instantaneous compensation for changing environmental conditions.

Abstract: An improved transducer is obtained by providing a plate of lithium tetrabte with a doubly rotated orientation of .phi..congruent.17.degree. to 21.degree. and .theta..congruent.54.degree. to 58.degree. where doubly rotated orientations are described by the IEEE notation widely known in the art as (YXwl).phi./.theta..

Abstract: An improved resonator is obtained by providing a plate of lithium tetraboe with a doubly rotated orientation of .phi..congruent.38.degree. to 42.degree. and .theta..congruent.30.degree. to 36.degree. where doubly rotated orientations are described by the IEEE notation widely known in the art as (YXwl).phi./.theta..

Abstract: A TCXO including a series capacitance is improved by having the temperature ensitivity of the series load capacitance be chosen in accordance with the formulaT.sub.C.sbsb.L =T.sub.C.sbsb.o +2 T.sub.K /(1-.alpha..sub.o)wherein T.sub.C.sbsb.L is the temperature coefficient of the series load capacitor, T.sub.C.sbsb.o is the temperature coefficient of the resonator static capacitance, T.sub.K is the temperature coefficient of the piezoelectric coupling for the resonator, and .alpha..sub.o is the center value of load factor .alpha. and wherein the load factor, .alpha., is defined as ##EQU1## wherein C.sub.o is the resonator static capacitance and C.sub.L is the series load capacitance.

Abstract: A doubly rotated, stress and temperature compensated quartz crystal resonator. The crystal cuts are arbitrarity designated the SK1 and SK2 cuts. Lateral field excitation is used to excite only the b-mode of vibration (fast quasi-shear) and suppress the c mode (slow quasi-shear). Exclusive excitation of the b mode produces a resonator with a higher Q and lower phase noise than otherwise achievable.

Abstract: A low aging piezoelectric resonator is made from a plate of piezoelectric terial using standard resonator fabrication techniques with identical electrodes applied to both major faces of the plate; the electroded plate mounted in a suitable enclosure and the unit vacuum baked and sealed under high vacuum to remove as much contamination as possible, and a DC voltage impressed between the resonator electrodes and the enclosure to create a static electric filed within the enclosure.

Abstract: The invention is a high power microwave hardened mine wherein a detonation harge and its appropriate detonation circuitry are disposed within a housing that is impervious to high power microwave energy. A power source and a sensor that provides the detonation signal are connected to the detonation circuitry via two sets of input and output piezoelectric transducers which convert an electrical signal to an acoustic one, the input, and then convert the acoustic signal back to an electrical signal, the output. By providing for d.c. to r.f. and r.f. to d.c. converters, the power source can be placed externally to the metal package and therefore, the battery can be easily and safely replaced.