1311 results about "Magneto optical" patented technology

A dynamic image recording button and a still image recording button are provided at the main unit of a movie camera. A magneto-optical recording medium is loaded in a slot. If the dynamic image recording button or the still image recording button is operated during a reproduction operation, the reproduction operation is interrupted in a state in which the mechanical drive (rotation) of the magneto-optical recording medium is sustained. At this point, a dynamic image signal or a still image signal obtained through a photographing operation performed at the camera unit is temporarily recorded in a buffer memory, and is written in the magneto-optical recording medium when a write in the magneto-optical recording medium becomes enabled. Instructions to record dynamic images and to record still images can be issued to the movie camera through a touch-panel provided on the screen of a liquid crystal display unit. Even when operation cannot be performed through the touch-panel, the instructions can be issued through the dynamic image recording button or the still image recording button.

An optical transducer comprises an optical element for directing an electromagnetic wave to a focal region and a metallic nano-structure having a longitudinal axis substantially parallel to an electric field of the electromagnetic wave, the metallic nano-structure being positioned outside of the optical element, wherein the electromagnetic wave produces surface plasmons on the metallic nano-structure. A cladding material having a refractive index differing from the refractive index of the optical element can be positioned adjacent to a surface of the metallic nano-structure. Magneto-optical recording heads that include the transducers and disc drives that include the magneto-optical recording heads are also included.

A method and apparatus for processing attached E-mail data and storage medium for processing a program for attached data in which, in sending / receiving an E-mail using a virtual pet displayed on a real world oriented GUI screen as an agent, in which parameters controlling the behavior of the agent are processed on the side of a server and returned to the user to enable the user to change the agent behavior. A user appends agent parameters to an E-mail to send the resulting mail to a pre-set address. An Internet service provider receives the E-mail to judge whether the title (Subject:) of the mail header is (cocktail lounge). If the title is the cocktail lounge, the physical power parameter of the agent parameter is lowered to append it to the E-mail Magneto-optical disc to send the mail back to the user. On the user side, the tipsy behavior of the drunken pet is displayed on the basis of the agent parameters appended to the E-mail Magneto-optical disc.

Information is recorded on an information recording medium such as a magneto-optical recording medium, having two recording tracks arranged alternately, typically in a double spiral manner. The two recording tracks have different recording characteristics and information is firstly recorded on the recording track less liable to cross write, typically on a land section, and subsequently on the recording track more liable to cross write, typically on a groove section.

Provided are an atomic magnetometer and an operating method of the same. The atomic magnetometer includes a vapor cell receiving a circularly polarized pump beam and a linearly polarized probe beam and containing an alkali metal vapor, a detector adapted to receive the probe beam passing through the vapor cell to measure magneto-optical rotation of the probe beam, a feedback coil to establish a negative feedback magnetic field signal orthogonal to a first plane defined by traveling directions of the probe beam and the pump beam and provide the negative feedback magnetic field signal to the vapor cell, and a feedback amplifier adapted to provide feedback current to the feedback coil such that the negative feedback magnetic field proportional to a measurement magnetic field is established. The measurement magnetic field of a measurement target provides magneto-optical rotation of the probe beam in the vapor cell.

Stable magnetic field measurement is enabled without collapse of polarization or fluctuation of intensity of a laser beam incident on a glass cell of an optical pumping magnetic sensor. Excitation light generated with a light source, having optimized light intensity and polarized wave, through frequency stabilization, intensity control and polarized-wave control, is introduced via a polarized wave holding optical fiber to a magnetic sensor provided in a magnetic shield, and magnetic field measurement is performed by optical pumping using magneto-optical properties of spin-polarized alkali metal. The magnetic sensor has a structure where a lens, a polarization optical device, the glass cell and a photodetector, are integrally accommodated in a non-magnetic case.

A holographic display device comprising at least one magneto-optical spatial light modulator (MOSLM). The holographic display device may comprise a first MOSLM and a second MOSLM, the first and second MOSLMs encoding a hologram and a holographic reconstruction being generated by the device. An advantage of the device is fast encoding of holograms.

A resonator system comprises an optical resonator that supports one or more pairs of nearly degenerate defect states. One or more magnetic domains comprising at least one gyrotropic material in the optical resonator cause magneto-optical coupling between the two states so that the system lacks time-reversal symmetry. In one embodiment, a single magnetic domain is used that dominates induced magneto-optical coupling between the defect states. The above resonator system may be used together with other components such as waveguides to form circulators, add drop filters, switches and memories.

An atomic magnetometer is used to detect radio frequency magnetic fields, such as those generated in nuclear resonance experiments. The magnetometer is based on nonlinear magneto-optical rotation and pumps an atomic vapor into a quadrupole aligned state. Detection of the modulation of the polarization of a linearly polarized beam provides the radio frequency signal, which can then be processed to extract the component frequencies.

An audio / video production system is implemented on a PC-based platform, preferably utilizing various forms of removable magnetic, optical, or magneto-optical storage media. Specially modified cameras or other sources provide digitally data-compressed audio and video program materials in two formats, a first format having a higher data-compression ratio and intended for use in off-line systems to develop edit decision lists, and a second format having a lower data-compression ratio and intended for use in on-line editing and to produce the final representations of the programs. Off-line editing decisions may thus be developed on a PC using removable storage media, and final representations of the programs may be produced on-line in accordance with stationary-head or rotary-head digital-tape-based formats, such as DAT, 6-mm or 8-mm tapes. In an alternative embodiment, automatic and unattended editing, or extended program playback of more than 40 hours duration of digital video, is available.

A composite micro-lens for use in an optical or magneto-optical information storage system, made up of one or more lens elements which, when coupled in assembly, provide a desired numerical aperture. The design may provide, if necessary, a photo resist lens, a shaped ball lens, or one or more contoured surfaces within the composite construction to correct for aberrations. The composite lens designed in this manner allowing for the use of wafer-level assembly processes to provide high volume production capabilities. It is further intended that this micro-lens design support integration in an optical or magneto-optical head design.

A method for fabricating an integrated optical isolator includes depositing a wire grid material on a magneto-optical substrate and depositing a resist film on the wire grid material. The method further includes bringing a mold with a wire grid pattern on contact with the resist film and compressing the mold and resist film together so as to emboss the wire grid pattern in the resist film. The method further includes transferring the wire grid pattern in the resist film to the wire grid material on the magneto-optical substrate by etching.

A disc recording apparatus (A) for writing data onto a sector providing a recording area (B2) on a magneto-optical disc (B) performs a retry upon failure in the writing until a predetermined number of retries is reached, treats the sector as a defective sector upon failure in the last retry of the predetermined number of retries, and writes the data onto another sector. During a physical formatting, A CPU (11) records in medium management information (B1) on the recording disc (B) a retry count as retry count information for each of recovered sectors recovered from the failure through success in the writing of data during the retry. When actual data is written onto the physically formatted magneto-optical disc (B), and upon detection of a defective sector failed in the writing of the actual data, the CPU (11) selects a replacement sector for the defective sector. The replacement sector has a retry count stored as the retry count information smaller than that of the defective sector.

The invention relates to a photonic crystal magneto-optical circulator comprising a first medium material columns in an air background, the first medium material columns are arranged in the shape of two-dimensional tetragonal lattice; the photonic crystal magneto-optical circulator also comprises a photonic crystal waveguide which includes a transverse photonic crystal waveguide and a longitudinal photonic crystal waveguide which are mutually intercrossed, a second medium material column used for guiding light and positioned at the cross connection of the transverse photonic crystal waveguideand the longitudinal photonic crystal waveguide, four identical magneto-optical material columns uniformly positioned around the second medium material columns, and at least three identical third medium material columns respectively positioned outside the three magneto-optical material columns. The photonic crystal magneto-optical circulator provided by the invention can respectively realize single direction optical circulating transmission among three ports arranged in the shape of T and among four ports arranged in the shape of a cross. The photonic crystal magneto-optical circulator provided by the invention is advantageous in that it has a concise form and a compact structure, and is suitable for serving as an anti-interference component in a photonic crystal integrated optical circuit.

An optical data-storage hard disk drive, which uses stationary Magneto-Optical Microhead Array Chips in place of conventional Flying-Heads, Rotary Voice-Coil Actuators and other similar types of Servo-Tracking mechanisms to transcribe or retrieve digital information to or from at least one non-volatile memory medium's data-surface, using an optical magnetic process of recording and reading data. The Magneto-Optical Microhead Array Chip Hard Disk Drives will have at least one storage disk-platter with two disk-platter data-surfaces containing a multiplicity of concentric data-tracks that rotates at a substantially constant angular velocity. Every Magneto-Optical Microhead Array Chip will comprise a (VCSEL) "Vertical Cavity Surface Emitting Laser" microhead array having a minimum of one thousand or a maximum of four billion individually addressable VCSELs. Each Magneto-Optical Microhead Array Chip is placed into a stationary position above each disk platter data-surface using a chip-positioning circuit board. While the number of cylinder / tracks available to each Magneto-Optical Microhead Array Chip is determined by the number of VCSEL microheads contained within a Magneto-Optical Microhead Array Chip's microhead array (e.g., "325,000" vertical cavity surface emitting laser microheads would therefore equal "325,000" corresponding cylinder / tracks).

The invention relates to a photonic crystal magneto-optical circulator, which comprises first dielectric material columns in an air background, wherein the first dielectric material columns are arranged in the form of two-dimensional square lattice. The photonic crystal magneto-optical circulator also comprises a “T-shaped” or a “cross-shaped” photonic crystal waveguide, a second dielectric material column, four same magneto-optical material columns and at least three same third dielectric material columns, wherein the “T-shaped” or a “cross-shaped” photonic crystal waveguide comprises a horizontal photonic crystal waveguide and a vertical photonic crystal waveguide which are intercrossed; the second dielectric material column is arranged at a cross-connected position of the horizontal photonic crystal waveguide and the vertical photonic crystal waveguide and has the function of light guiding; the four same magneto-optical material columns are uniformly arranged on the periphery of the second dielectric material column; and at least three same third dielectric material columns.

An optical waveguide isolator for use in an optical communication system is disclosed. The optical waveguide isolator comprises a semiconductive light amplifier structure including a semiconductor substrate of first conductivity type having a surface of a layer to be formed thereon, a first cladding layer of first conductivity type formed on the substrate, an active layer formed on the first cladding layer, a second cladding layer of the second conductivity type opposite to first conductivity type, formed on active layer, a first electrode formed on the surface of the semiconductor substrate opposite to the surface to be formed as a layer, and a second electrode formed on the second cladding layer; the first and the second cladding layers and the active layer form an optical waveguide in which the light wave propagates. The semiconductive light amplifier structure further comprises a light absorptive magnetic material layer having light absorption function for the light wave propagating through the optical waveguide. The magnetic material layer is magnetized so as to have the magnetic-field component in the direction which corresponds to the direction where a magnetic vector of the light wave vibrates, the waveguide structure body has a nonreciprocity optical characteristic that effective refractive index changes into the light wave to which the optical waveguide is propagated according to the magnet-optical effect of the light absorptive magnetic material layer according to the direction of propagation, by the effective refractive index change in the nonreciprocity, the attenuation of the first light wave that the optical waveguide is propagated in the first direction caused when the said waveguide is propagated, becomes small more than the attenuation of the second light wave propagated in the second direction opposite to the first direction caused when the said waveguide is propagated.

A chemically strengthened glass substrate for use as the substrate of an information recording medium such as a magnetic disk, magneto-optical disk, DVD, or MD, wherein a strengthened layer formed by chemical strengthening exists on the outer edge surface and on the inner edge surface but substantially not on a surface on which an information recording layer is formed.

An optical atomic magnetometers is provided operating on the principles of nonlinear magneto-optical rotation. An atomic vapor is optically pumped using linearly polarized modulated light. The vapor is then probed using a non-modulated linearly polarized light beam. The resulting modulation in polarization angle of the probe light is detected and used in a feedback loop to induce self-oscillation at the resonant frequency.

Electronically agile optical filtering modules for equalizing light propagation differences in at least two spaced optical beam pathways in the modules. The modules use optical polarization rotation devices that may include acousto-optic tunable filter (AOTF) devices, liquid crystal devices, and magneto-optic devices. Such devices may be subject to polarization dispersion losses (PDL) and polarization mode dispersion (PMD) that may be different for when light travel along different light paths through the device. By redirecting light beams back along a different bi-directional path through the devices which may exhibit non-uniform performance across orthogonal polarizations, PDL and PMD may be reduced.

A magneto-optical data storage hard disk drive that uses stationary "Light Intensity Modulated Direct Over-Writey" (LIMDOW) or "Magnetically induced Super Resolution" (MSR) "Magneto-Optical Microhead Array Chips' in place of conventional flying-heads, rotary voice-coil actuators, or other similar types of "servo-tracking' mechanisms to simultaneously record and / or reproduce data to and / or from a multitude of data-tracks located across the data-surfaces of a multitude of LIMDOW or MSR disc media that comprise two or more different coercive force regions at room temperature, using a multitude of microheads.

A data encryption / decryption apparatus is disclosed which includes a controller coupled to an array of random data, an encryptor / decryptor and a plurality of encryption / decryption algorithms. The array of random data and the plurality of encryption / decryption algorithms are stored on an electronically readable media. The data encryption / decryption apparatus can encrypt and decrypt data, video, audio. The electronically readable media includes random access memory, read only memory, magnetic media, optical media, magneto-optical media, CDROM, digital video disk (DVD), hard disk, a remote computer memory storage location accessible via an electronic network such as a telephone system or a computer network, or any other electronically readable media method. The controller is responsive to a key code input to the controller. The controller determines a first computed address in the array of random data and a control data length. The controller then retrieves the control data from the first computed address in the array of random data.

A magneto-optical recording head comprises a magnetic coil formed on a lower surface of a transparent substrate opposed to a magneto-optical disk. A heat sink layer is provided at the outside of the magnetic coil on the lower surface. An objective lens is supported on an upper surface of the transparent substrate. The heat, which is generated by the magnetic coil, is released via the heat sink layer to the space between the magneto-optical disk and the substrate. The release of the heat is facilitated by the air stream which is generated by the rotation of the magneto-optical disk. The heat can be effectively released from the magnetic coil without inhibiting optical characteristics of the objective lens.