摘要:
A recording/reproducing head for performing at least one of a record operation of recording information onto a dielectric recording medium and a reproduction operation of reproducing the information from the dielectric recording medium, the recording/reproducing head provided with: a support member which extends in a longitudinal direction of the recording/reproducing head; and a projection portion which is mounted on the support member such that a tip of the projection portion faces the dielectric recording medium, the projection portion having a ridge-line on the tip, the projection portion being capable of contacting the dielectric recording medium at one point on the ridge-line.
摘要:
A wavelength converting device for converting a wavelength of a light is provided. The wavelength converting device includes: a substrate comprising MgO; a waveguide membrane comprising KNbO.sub.3, for guiding the light; a buffer membrane which is disposed between the substrate and the waveguide membrane and which comprises KTa.sub.x Nb.sub.(1-x) O.sub.3. A mixing rate of Ta in the KTa.sub.x Nb.sub.(1-x) O.sub.3 in the buffer membrane is in a range of 40 atom % to 60 atom % at a surface of the buffer membrane touching the substrate, and is 0 atom % at a surface of the buffer membrane touching the waveguide membrane.
摘要:
When a potassium-containing substance is formed in to a film using an organic potassium complex as a potassium source by the CVD method, it is prevented that the film formation rate is changed with the lapse of time, and the potassium content in the film thus formed is changed.As a potassium source for vaporization used for depositing the potassium-containing substance on a substrate by the CVD method, a .beta.-diketone complex of potassium that has been melted by heating to a temperature higher than its melting point and then cooled to be solidified is used.
摘要:
A method of manufacturing a ridge-shaped 3-dimensional waveguide, has the steps of: forming a crystal film made of a second ferroelectric oxide non-linear crystal having a refractive index higher than that of a substrate made of a first ferroelectric oxide non-linear crystal on the substrate; forming a metal film on the crystal film; forming a mask by etching the metal film; and forming a ridge portion by selectively removing the crystal film through the mask by a dry etching method.
摘要:
A surface acoustic wave device includes a crystalline substrate with a structure selected from the group consisting of the perovskite structure, the spinel structure, and the rock salt structure. The device also includes a thin piezoelectric crystalline film having the perovskite structure and deposited on the crystalline substrate by chemical vapor deposition, and an electrode means for generating a surface acoustic wave on the thin piezoelectric crystalline film. In the device, a surface of the crystalline substrate on which the thin piezoelectric crystalline film is deposited is a mirror surface inclined at an offset angle &thgr; from the (001) plane of the crystalline substrate, and the electrode means have electrode fingers arranged in parallel to each other so that a surface acoustic wave propagates along one direction of crystalline axes of the thin piezoelectric crystalline film.
摘要:
A surface acoustic wave device includes a crystalline substrate with a structure selected from the group consisting of the perovskite structure, the spinel structure, and the rock salt structure. The device also includes a thin piezoelectric crystalline film having the perovskite structure and deposited on the crystalline substrate by chemical vapor deposition, and an electrode means for generating a surface acoustic wave on the thin piezoelectric crystalline film. In the device, a surface of the crystalline substrate on which the thin piezoelectric crystalline film is deposited is a mirror surface inclined at an offset angle &thgr; from the (001) plane of the crystalline substrate, and the electrode means have electrode fingers arranged in parallel to each other so that a surface acoustic wave propagates along one direction of crystalline axes of the thin piezoelectric crystalline film.
摘要:
A second harmonic wave-generating element for generating a second harmonic wave from a fundamental wave, having an optical waveguide layer made of first epitaxial material having a fundamental composition of K3Li2−x(Nb1−YTaY)5+XO15+Z, an underclad part made of second epitaxial material having a fundamental composition of K3Li2−X+A(Nb1−Y−BTaY+B)5+X−AO15+Z, an overclad part made of third epitaxial material having a fundamental composition of K3Li2−X+C(Nb1−Y−DTaY+D)5+X−CO15+Z and formed on and contacting the optical waveguide layer, wherein X=0.006 to 0.5, Y=0.00 to 0.05, A=0.006 to 0.12, B=0.005 to 0.5, C=0.006 to 0.12, D=0.005 to 0.5, X−A≦0, X−C≧0, |A−C|≦0.006, and |B−D|≦0.005).
摘要:
A raw material feeding apparatus is provided for a film-forming apparatus in which a thin film is formed from a solid matter as a raw material during chemical vapor-phase deposition. The apparatus includes sub-containers each having an opening for introduction of a gas, an opening for discharge of a gas, a bottom, on which a solid raw material is spread between the inlet opening and the outlet opening, and a wall defining a gap, in which a gas being introduced and discharged is made to contact the solid raw material spread on the bottom while the gas is moved on the surfaces of the material. The apparatus also includes a raw material container for receiving and holding the sub-containers. The apparatus also includes a heating device for heating the raw material container, and carrier gas conveying tubes for introducing a carrier gas into the raw material container and including a passage communicated to the outlet openings of the sub-containers.
摘要:
A method of subliming material is provided for use in a CVD film preparation method wherein a CVD precursor is sublimed from its solid state by heating to a temperature not exceeding its melting point, thereby producing a vapor of the precursor, and the vapor of the precursor is transported to a reactor. The method of subliming material comprises the steps of forming the solid-state compound into a film, covering a back surface of the film with a non-reactive support and exposing a front surface of the film to an atmosphere as a sublimation surface. The method maintains the exposed surface area of the solid compound constant during processing.
摘要:
A method for feeding metalorganic gas from solid raw materials in MOCVD and its device provides an absorption reagent consisting of porous grains into which a solid metalorganic material is absorbed and the passing of the carrier gas among the absorptive porous grains in the container under a high thermal condition. The mixture gas including the metalorganic gas at a constant density is obtained in stability for a long time.