Abstract: An electro-holographic light field generator device comprises surface acoustic wave (SAW) optical modulators arranged in different directions. Specifically, some embodiments have SAW modulators arranged in pairs, nose-to-nose with each other, and have output couplers that provide face-fire light emission. These SAW modulators also possibly include SAW sense transducers and/or viscoelastic surface material to reduce crosstalk.

Abstract: Devices having an air bearing surface, the device including a magnetic write pole positioned adjacent the air bearing surface; a near field transducer including a peg region and an adjacent disk region, wherein the peg region is adjacent the air bearing surface; a heat sink; and an optical waveguide including a top cladding layer and a core layer, wherein the heat sink is positioned between the magnetic write pole and the near field transducer and the near field transducer is positioned between the optical waveguide and the heat sink, and wherein at least a portion of at least one of the heat sink, the optical waveguide, or the write pole includes beryllium oxide (BeO).

Abstract: An ultrasonic reactor system with an appropriately designed reactor chamber used in conjunction with a compatible ultrasonic Barbell Horn or its derivative that provides a significant efficiency increase and an intensification of sonochemical and sonomechanical processes is disclosed. These enhancements arise from the ability of the reactor chamber to direct all treated liquid media through the highly active ultrasonic cavitation region located near the surface of the horn, as well as from several improvements in the Barbell Horn design that significantly increase its longevity and in its output surface area, thereby increasing the total size of the active cavitation region.

Abstract: Four switching circuit sections consisting of four FETs connected in series are provided between a plurality of input/output terminals which output and input a high frequency signal. Gate control voltages are individually applied to gate terminals of four FETs, respectively, so that an on-state and an off-state are achieved. Further drain control voltages are individually applied to drain terminals or source terminals of the FET in each switching circuit section, and a voltage according to an electric power value of the high frequency signal supplied to each of switching circuit sections is supplied as the gate control voltage and the drain control voltage.

Abstract: The present invention comprises an ultrasonic resonant rod waveguide-radiator with at least three cylindrical sections, one of which is an entrance section having a planar entrance surface and another of which is an exit section having a planar exit surface, and at least two sections having a variable cross-section. The cylindrical sections and sections of variable cross-section are arranged in alternating fashion and connected to each other acoustically rigidly. The dimensions of the cylindrical sections and the sections of variable cross-section are selected so that the gain of the waveguide-radiator is significantly greater than unity and the strain created by passage of ultrasonic waves through the waveguide-radiator is minimized, increasing the operational life of the waveguide-radiator and maximizing the amount of useful energy transmitted by the waveguide-radiator.

Abstract: A diffraction-optical component for providing a radiation-diffracting grating structure is proposed, comprising a surface wave device including a substrate 43, a surface wave source 47 excitable with an adjustable frequency for producing surface waves on a surface 45 of the substrate 43 and an interaction region 17 of the substrate surface 45 which is provided for the radiation to interact with a grating structure provided by the surface waves produced.

Abstract: A thin film microstructure is formed from a substrate having a film of vapor deposited material extending in distinct helical columns from the substrate. The distinct helical columns may terminate distally from the substrate in a region of denser material forming a cap for the helical columns. The cap and substrate may be each connected, respectively, to first and second electrodes, and may operate in conjunction with an acoustic wave sensor.

Abstract: Acoustic buffer rods are useful in the nondestructive ultrasonic evaluation of materials. In order to reduce the occurrence of spurious signals in the reflected acoustic waves forming an acoustic "image" of a sample, it is proposed to design buffer rods such that their radial acoustic velocity profile is graded, preferably having a parabolic shape. The lowest acoustic velocity of the buffer rod is in its center, i.e. at the longitudinal axis of the rod. This design is applicable to both uncladded buffer rods as well as to the core of cladded ones.

Abstract: Methods are disclosed for the elimination of spurious echos in electro-acoustic delay lines using bulk waves. The method consists in etching an array, formed of hollows and peaks on a reflecting side of a delay line of this type, the difference in height between the said hollows and peaks giving the waves reflected from them a phase difference such that the signals induced by the spurious echos in the transducer cancel one another out. The method can be used to improve the characteristics of a delay line using bulk waves without excessively complicating its manufacture.

Abstract: A surface acoustooptic wave deflector comprises: a thin film optical wave guide path; an input photocoupler for guiding a light onto the optical guidewave path from the outside; at least one surface acoustic wave exciting device for exciting a surface acoustic wave which is transmitted in the optical waveguide path, a part of this surface acoustic wave crossing the light which is transmitted in the optical waveguide path and deflecting the light due to an acoustooptical effect; at least one surface acoustic wave receiving device provided in the transmitting path of the surface acoustic wave which is excited by the surface acoustic wave exciting device; at least one external circuit including an amplifier, this external circuit forming a closed loop together with the exciting device and the wave receiving device and constituting a positive feedback type generator; and an output photo coupler for outputting the transmitted light to the outside.

Abstract: An elastic waveguide, for propagating acoustic waves, consists of an elongated solid core region and an elongated solid outer cladding region. The acoustic waves propagate in a mode where the principle particle displacement is substantially parallel to the longitudinal axis of the waveguide, this mode is called longitudinal mode. The material densities and the bulk shear wave velocities of the core and cladding region are substantially the same but the bulk longitudinal wave velocity of the cladding region is larger than that of the core region.

Abstract: An acoustic wave signal processing device which in a preferred embodiment utilizes at least one holographic grating formed within a portion of the interior of a substrate which is capable of supporting the propagation of bulk acoustic wave signals therein. The grating provides spatially varying acoustic impedances within the substrate and interacts with bulk acoustic wave signals propagated therethrough so as to produce output acoustic wave signals. The grating and transducers for producing and receiving the input and output bulk acoustic wave signals, respectively, can be arranged to provide a variety of signal processing operations which may be desired, such as providing resonating operations and filter operations, for example.

Abstract: A magnetostatic wave device operating within a biasing magnetic field for delaying microwave signals is described including a layer of YIG material having a predetermined thickness, first and second transducers spaced apart for generating and receiving magnetostatic waves in the YIG material and a ground plane having a plurality of spacings from said YIG material, each spacing having a predetermined length along the propagation path between the first and second transducers. The invention further includes first and second layers of YIG material, first and second transducers spaced apart for generating magnetostatic waves in said first material and said first material having a plurality of spacings from said second material, each spacing having a predetermined length along the propagation path from said first to said second transducer. The invention overcomes the problem of undesired phase or group delay variations from a desired linear or quadratic phase variation as a function of frequency.

Abstract: The linearity of group delay versus frequency in magnetostatic wave delay lines is improved by a linear variation of one of three discrete parameters in the region between the two delay line transducers. The parameter variation is applied to magnetostatic wave delay lines that have a ground plane, a magnetic garnet crystal film substrate that is spaced from the ground plane and has transmitting and receiving transducers engaged to it, and a magnetic bias field. The discrete parameters varied are the magnetic bias field; the distance of the substrate from the ground plane; and the thickness of the substrate. Appropriate linear variations of any one of the these parameters provides improved linearity of group delay versus frequency.

Abstract: An acoustic guided wave device has a wave guiding volume (20) which may include transducer elements (22-25) and other metal elements (26), sandwiched between two acoustic half spaces (10, 12) having acoustic velocity faster than the effective acoustic velocity of the material within the wave guiding volume.

Abstract: Electroacoustic apparatus is described incorporating a substrate having a transducer on an upper surface and a transducer on a lower surface positioned for receiving bulk acoustic waves; substrate taper along with transducer geometry are combined to provide bulk acoustic signals in the near zone or Fresnel zone which provide for phase and amplitude cancellation of a triple transit signal.The invention overcomes the problem of spurious triple transit signals in bulk mode acoustic delay lines for input signals having a wide bandwidth, such as an octave, and where the delay times are short such that the bulk acoustic wave remains in the near zone or the transition region between the near zone and far zone.