摘要:
The radiation detector of the present invention comprises a joined scintillator block body which is composed of a plurality of photomultiplier tubes combined together and a plurality of scintillator blocks which are joined to entrance windows of the combined photomultiplier tubes so that the size of the entrance windows is in agreement with that of the light-outgoing plane of the scintillator blocks, the number of the scintillator blocks being greater than that of the photomultiplier tubes. The joined scintillator block body is designed such that the reflectances of the interfaces between the scintillator blocks increase as they are positioned away from the interfaces of the combined photomultiplier tubes.
摘要:
Herein provided is an optical isolator which permits the reduction of the production cost and which is excellent in the thermal shock resistance. The optical isolator of the present invention is that the Farady rotator be adhered to the birefringent crystals or glass polarizers through adhesive layers and that the glass transition point of the adhesive be not more than −40° C.
摘要:
Proposed is an improvement in a magnetostatic surface wave device such as an S/N enhancer comprising a thin film chip of a magnetic oxide garnet, e.g., gallium-substituted YIG epitaxially grown on the surface of a substrate, e.g., GGG, to which a magnetic field is applied within the plane of the thin film. The low-pass cut-off frequency of the microwaves can be decreased to 400 MHz or lower and the half-value width of magnetic resonance .DELTA.H can be small enough when the principal plane of the thin film of the magnetic oxide garnet is the (110) plane and the magnetic field applied thereto is in such a direction that the angle between the direction of the magnetic field and the direction of the axis of the thin film within the (110) plane is in the range from .+-.27.degree. to .+-.33.degree..
摘要:
An improvement in the Czochralski single crystal growing of a rare earth-gallium garnet such as gadolinium gallium garnet according to which the single crystal boules of a relatively large diameter and outstandingly free from any crystal defects and inclusions are readily obtained. The improved method comprises keeping the melt of the oxide mixture formed in an iridium crucible for at least 15 hours in the molten state before crystal growing is started. It was also shown that addition of certain additive gases, e.g. water vapor, carbon dioxide and oxygen, to the gaseous atmosphere mainly composed of, for example, nitrogen, in which crystal growing was performed, in a limited proportion was effective to further improve the crystal quality and to decrease the particulate inclusions in the single crystal boules.
摘要:
An optical isolator has a high ratio of the quantity of signals S to that of noises N (S/N ratio) and can be miniaturized such a size that it can easily be incorporated into a laser module. The optical isolator 1 according to the present invention is one to be connected to a semiconductor laser 11 having a linear polarization plane and comprises a Faraday's rotator 5 and a magnetic material 4 for establishing a magnetic field around the rotor on the light-incident side of the isolator and an optical material 6 for polarization on the light-outputting side thereof. In particular, the optical isolator 1 of the present invention is one to be connected to a semiconductor laser 11 having a linear polarization plane while aligning a polarization direction guide 3 of the isolator with the semiconductor laser 11, comprises a Faraday's rotator 5 whose light-incident and -outputting sides are desirably inclined with respect to the optical path and an annular magnetic material 4 surrounding the rotator 5, on the light-incident side of the isolator and an optical material 6 for polarization, on the light-outputting side thereof, whose light-incident and -outputting sides are desirably inclined with respect to the optical path, and the optical material for polarization is more desirably made of a metal-containing glass material.
摘要:
An optical isolator comprises a polarizer, a Faraday rotator, an analyzer and a magnet for applying a magnetic field to the Faraday rotator wherein the polarizer is incorporated into a first metal cylinder to form a polarizer unit, the Faraday rotator is incorporated into a cylindrical magnet to form a Faraday rotator unit and the analyzer is incorporated into a second metal cylinder to form an analyzer unit, the polarizer, Faraday rotator and analyzer units being arranged within an outer cylinder and the first metal cylinder and the second metal cylinder being joined to the outer cylinder through an adhesive component. The optical isolator can easily be produced, the adhered and supported portion thereof is not peeled off and it has high reliability.
摘要:
The joined scintillator block body for radiation detector according to the present invention comprises a plurality of scintillator blocks, each being divided into small scintillator chips through deep grooves formed by cutting each block from the light-incident side and filled with a reflecting material and these plurality of blocks being joined together, wherein a part of the joined faces of each neighboring two blocks is joined with the reflecting material and the remaining portion thereof is joined with a transparent resin layer capable of transmitting scintillation light rays emitted by the scintillator chips. In the foregoing joined scintillator block body for radiation detector, all of the divisions or scintillator chips of the joined scintillator block body have the same ability of light emission and, therefore, the radiation can always be detected at any portion on the photomultiplier tube under the sam conditions.
摘要:
The optical isolator of the present invention comprises a polarizer, a Farady rotator and an analyzer arranged in this order, wherein the Farady rotator has a garnet crystalline structure represented by the formula (Tb.sub.1-(a+b) Ln.sub.a Bi.sub.b).sub.3 (Fe.sub.1-c M.sub.c).sub.5 O.sub.12 wherein Ln represents at least one element selected from the group consisting of rare earth elements other than Tb; 0
摘要:
An improved epitaxial single crystal wafer suitable as a working element of magnetostatic wave devices is proposed which comprises a substrate single crystal wafer of a rare earth gallium garnet, e.g., gadolinium gallium garnet, neodymium gallium garnet and samarium gallium garnet, and an epitaxial layer formed thereon having a chemical composition, different from conventional yttrium iron garnet, Y.sub.3 Fe.sub.5 O.sub.12, of the formula(Y.sub.1-x M.sub.x).sub.a Fe.sub.8-a O.sub.12 or (Y.sub.1-x M.sub.x).sub.a (Fe.sub.1-Y Q.sub.y).sub.8-a O.sub.12,in which M is an element selected from the group consisting of bismuth, lanthanum, gadolinium and lutetium, the subscript a is a positive number in the range from 3.0 to 3.1, the subscript x is a positive number in the range from 0.01 to 0.9, Q is an element selected from the group consisting of aluminum, gallium, indium and scandium and the subscript y is a positive number in the range from 0.1 to 0.2. These epitaxial wafers are advantageous in respect of the greatly decreased problem of mismatching in the lattice constants between the substrate and the epitaxial layer.
摘要:
There is disclosed a piezoelectric single crystal wafer wherein an etching pit density on the front surface of the wafer on which an electrode for transmit-receive of surface acoustic wave or leaky surface acoustic wave is formed is 7.8×104/mm2 or less, and a piezoelectric single crystal wafer wherein surface roughness Ra on the peripheral surface other than the front surface and the reverse surface of the wafer is 2.3 &mgr;m or less. There can be provided a piezoelectric single crystal wafer wherein a deviation of surface acoustic wave velocity or leaky surface acoustic wave velocity is small, namely the uniformity of the velocity is excellent, and fine contaminations adhered on the surface where electrode is formed and breakage of the wafer can be significantly reduced, and therefore a device such as a filter having excellent property can be produced in high yield.
摘要翻译:公开了一种压电单晶晶片,其中形成有表面声波或泄漏声波的发射接收用电极的晶片的前表面上的蚀刻坑密度为7.8×10 14 / mm 2以下,压电 其中除了晶片的前表面和反面之外的外围表面上的表面粗糙度Ra为2.3μm或更小的单晶晶片。 可以提供一种压电单晶晶片,其中表面声波速度或泄漏表面声波速度的偏差小,即速度的均匀性优异,并且附着在形成电极的表面上的细小污染物和 可以显着降低晶片,因此可以高产率地制造具有优异性能的过滤器等装置。