49results about "Optical beam sources" patented technology

Mode hop detection is provided. A device includes circuitry to receive, from a reader element an indication of one or more properties of a magnetic medium detected by the reader element. The device includes circuitry to determine an envelope of the signal. The device includes circuitry to adjust, responsive to the envelope, a current provided to a laser configured to heat the magnetic medium.

Provided are arrangements of optical elements that combine the features of a high power, compact laser that exhibits narrow linewidth output and that does not appreciably shift in wavelength or vary in power over a wide range of temperatures. Such arrangements include a transmission filter and a Bragg reflector that select out the wavelength for which the output power of a reflective semiconductor optical amplifier (RSOA) is least affected by changes in temperature over a temperature range of interest. Such arrangements may also utilize temperature-insensitive materials.

The present application discloses a servo system and method, relating to the technical field of optical storage. This servo system solves the servo addressing problem when multi-focus parallel data reading is performed based on an array of light beams. The system includes an optical head assembly and a signal processing device. The optical head assembly is configured to generate a first set of optical signals including multiple optical signals, and to apply the first set of optical signals to multiple data points on an optical storage medium to obtain a second set of optical signals, which includes reference signals of at least three reference data points and data signals of data points to be read. The signal processing device is configured to receive the second set of optical signals, and obtain a servo control signal for adjusting the position of the optical head assembly according to the reference signals in the second set of optical signals and preset information of at least three reference points.

To provide a magnetic tape cartridge, a cartridge management system, a reading method, and a program enabling accurately reading an identifier.SOLUTION: A magnetic tape cartridge includes a case on which an identifier is displayed, and a storage medium in which reading condition information that is information regarding a condition for reading the identifier is stored.SELECTED DRAWING: Figure 8

A data reading and writing device and a data reading and writing method are provided. In the data reading device or data writing device, an optical head array including multiple laser heads is arranged, thereby increasing the number of laser heads for reading / writing data. Furthermore, each laser head is improved and multiple focal points are arranged on each laser head, thereby allowing multiple data to be read / written in parallel using multiple laser heads and multiple focal points in the laser heads in a single data reading process, thereby improving the data reading / writing throughput of the optical storage medium.

A drawing apparatus according to an aspect of the present disclosure includes a light source section and a scanning section. The scanning section irradiates a surface of the recording medium with a plurality of laser beams generated by the light source section. The light source section generates at least one laser beam among the plurality of laser beams to cause a beam shape of each of the laser beams at a position of the recording medium to satisfy a relational expression below, and to cause a length of the beam shape in a direction parallel to a scanning direction of the laser beams to be 0 degrees or more and 20 degrees or less with respect to the scanning direction of the laser beams: Ly×1.1≤Lx<Ly×5.0 d×0.8≤Ly≤d×1.3 Lx: Length of the beam shape in a direction parallel to the scanning direction of the laser beams Ly: Length of the beam shape in a direction orthogonal to the scanning direction of the laser beams d: Pixel size.

A single-servo-layer, multi-recording-layer optical disc drive, memory, and electronic device are disclosed. The optical disc drive contains a dichroic mirror. A beam of light from a first light source is projected onto one surface of the dichroic mirror and reflected onto the recording medium of the optical disc for reading and writing data. A beam of light from a second light source can directly pass through the dichroic mirror and be transmitted onto the servo layer of the recording medium. The dichroic mirror can be fixed inside the optical disc drive by a movable component. The movable component can change the orientation of the dichroic mirror to adjust the relative position between the propagation directions of the beams from the first and second light sources, eliminating errors generated during installation and use of the optical disc drive. The optical disc drive of this application has advantages such as minimal changes to the internal structure, simple implementation, and high control precision, achieving precise servoing of the second light source beam on the servo layer while the beam of the first light source is projected onto the center of the data track of each recording layer of the optical disc at a relatively low cost.

A method of writing voxels to a substrate using a laser writing system includes forming a first voxel at a first location in a substrate using a first laser pulse; detecting light emitted or scattered by the substrate due to the formation of the first voxel; determining whether the detected light satisfies a predetermined constraint; and adjusting the amplitude of the second laser pulse when the detected light does not satisfy the predetermined constraint. As a result of forming the voxel, light emission or scattering from the substrate is related to a property of the formed voxel. By monitoring such emission or scattering, changes in performance of the laser write system can be compensated. A laser writing system and a computer program product implementing the method are also provided herein.

An information verification method and related device are provided. In the method, a fluorescent signal may be obtained, where the fluorescent signal is an electrical signal generated based on a plurality of fluorescent spots, and the fluorescent signal includes a plurality of pulse signals; an information symbol corresponding to each pulse signal may be determined based on a preset amplitude threshold and an amplitude of each pulse signal; an information sequence may be obtained based on the information symbol corresponding to each pulse signal; and a verification result of the information sequence may be obtained based on a first quantity of pulse signals between any two pulse signals in the plurality of pulse signals and a time interval between the any two pulse signals. According to the application, resulting in an error in information content corresponding to the read signal can be resolved.

System and methods for evaluating build platform flatness and parallelism relative to a focal plane of a high-speed laser in high-speed laser motion systems, wherein the high-speed laser motion systems include the high-speed laser that generates a laser beam, and the build platform having a work plane, comprising positioning a plurality of pin-hole sensors within the focal plane of the high-speed laser, wherein each of the pin-hole sensors is positioned at a predetermined location; directing the laser beam to the predetermined locations of each pin-hole sensor; measuring a spot size of the laser beam at each pin-hole sensor, wherein the spot size at each pin-hole defining structure has a measureable diameter; comparing the measurable diameters obtained at each pin-hole sensor; and adjusting the work plane of the build platform to a position where the measurable diameters of the spot sizes are equal at each pin-hole sensor.

The present application relates to the field of optical technology, and specifically to an optical head torquer, an optical head, an optical reading and writing system, and a data reading and writing method. The optical head torquer includes: a driving unit, an objective lens holder, and a plurality of objective lenses mounted on the objective lens holder; the driving unit is used to drive the objective lens holder to move so that the plurality of objective lenses focus the laser beam onto the disk; the plurality of objective lenses include a main beam objective lens and a servo beam objective lens arranged in parallel along the suspension line direction, the suspension line direction is parallel to the tangential direction of the disk, the main beam objective lens is used to focus the main beam onto the disk, and the servo beam objective lens is used to focus the servo beam onto the disk. The torquer of the present application can increase the effective reading and writing area of the optical head, improve the data reading and writing effect of the optical head, and achieve high-quality reading and writing.

One example provides a system (800) for reading birefringence data. The system includes one or more light sources (802, 804), a first polarization state generator (808) positioned to generate a first polarization from light of a first wavelength band output by the one or more light sources, a second polarization state generator (810) positioned to generate a second polarization from light of a second wavelength band output by the one or more light sources, an image sensor (822) configured to acquire images of a sample area (814) via the first polarization and the second polarization, a polarization state analyzer (824) positioned between the sample area and the image sensor, a first bandpass filter configured to pass light of the first wavelength band to reach the image sensor, and a second bandpass filter configured to pass light of the second wavelength band to reach the image sensor.

The invention discloses an ultra-diffraction light-limiting storage read-write device based on an optical antenna and a preparation method, an optical antenna array of the device comprises a plurality of optical antenna structures distributed in an array, and each optical antenna structure comprises a pointed structure and a metal film layer wrapping the pointed structure. The metal film layers of any two adjacent optical antenna structures in each row are electrically connected, the metal film layers of any two adjacent optical antenna structures in each column are electrically connected, and the metal films wrapping the rows and the columns of the array are led out to electrodes at the edge of the optical antenna array through the electric connection. The input module is used for inputting driving control signals; according to the optical antenna, incident light super-diffraction limit focusing is achieved through strong electron accumulation of the optical antenna, the resolution ratio and the storage capacity of a conventional optical storage device are remarkably improved, the optical antenna has high imaging light wave collection efficiency, and the appearance design of the optical antenna gives consideration to ultralow fly height lt; and the requirement of 10nm is met.

This invention discloses an optical storage method based on a high-speed recording system using a rotating mirror. The method, implemented using a high-speed recording system, includes: 1. Encoding the data to be stored, including data information and recording coordinates, to obtain a corresponding binary code; 2. Adjusting the binary code to obtain a storage code; 3. Calibrating a high-speed digital output card and determining the recording substrate surface; 4. Generating corresponding light intensity waveform data based on the storage code and storing it in the calibrated high-speed digital output card; 5. Calibrating the optical spherical aberration between the objective lens and the recording substrate surface, and controlling the recording laser to perform recording operations in the y-axis direction; 6. Adjusting the focal length offset of the objective lens and repeating step 5 until all storage codes in the z-axis direction are recorded, obtaining three-dimensional volumetric storage data. This invention also provides an optical storage device. The method provided by this invention solves the problem of excessively long data storage time in the prior art, improving the success rate and accuracy of recording.

Mode hop detection is provided. A device includes circuitry to receive, from a reader element an indication of one or more properties of a magnetic medium detected by the reader element. The device includes circuitry to determine an envelope of the signal. The device includes circuitry to adjust, responsive to the envelope, a current provided to a laser configured to heat the magnetic medium.

Laser diodes that include a mirror stack on the light-exit facet. The mirror stack has a reflectivity into the active region that is greater in air than when the laser diode is integrated into an apparatus. Related apparatuses, data storage devices, computing systems, and methods.

The present invention relates to a method of concurrently storing visible grey scale or color information of an image and additional digital information on a data carrier.

Laser diode having a p-metal electrical contact that includes a metal adhesion layer disposed on the p-type region of the semiconductor laser structure, and a metal bi-layer disposed on the metal adhesion layer. The metal bi-layer includes a first metal layer disposed on the metal, adhesion layer, and a second metal layer disposed on the first metal layer. A metal conductive layer is disposed on the second metal layer. Related apparatuses, data storage devices, computing systems, and methods.

The invention discloses a data writing method, a data reading device, a memory and a data writing device, and belongs to the technical field of data storage. In the process of writing data by using the laser pulse string, the relative distance between the laser focusing position after adjustment and the laser focusing position before adjustment is smaller than the laser diffraction limit by adjusting the laser focusing position in the recording material, so that the currently generated voxel and the previous voxel are spatially overlapped. According to the method, the limitation that voxels need to be separated spatially in traditional optical data storage is eliminated, and the data storage density and storage capacity are improved. In the data reading process, the optical signals sequentially passing through the first polaroid, the recording material and the second polaroid are collected to determine the polarization information corresponding to the data in the recording material, the data can be read based on the polarization information, and the delay value of the nanostructure does not need to be obtained. According to the scheme, the data reading device is simpler, and the reading method is simpler.

Examples are disclosed that relate to efficiently producing multiple laser beams of a harmonic frequency from a fundamental frequency beam. One example provides a laser system comprising a laser configured to output a fundamental frequency beam, a first harmonic-generation stage, and a second harmonic-generation stage. The first harmonic-generation stage is configured to receive an input of the fundamental frequency beam from the laser, and output from the laser system a first-stage harmonic frequency beam and a first-stage residual fundamental frequency beam. The second harmonic-generation stage is configured to receive an input of the first-stage residual fundamental frequency beam, and to output from the laser system a second-stage harmonic frequency beam.

Embodiments of the present application relate to the technical field of optical disc reading / writing, and provide an optical pickup device and an optical disc reading / writing device, for use in solving the problem that the service life of an optical pickup device and the service life of an optical disc driver are restricted by the service life of a laser. The optical pickup device comprises a light source part and an acting part; the light source part is used for generating light source beams to be projected to the acting part; and the acting part is used for receiving the light source beams and using the light source beams to carry out data reading / writing on an optical disc. The wavelength of at least some of the light source beams is a first wavelength. The light source part comprises N first wavelength lasers; the first wavelength lasers are used for generating first wavelength laser beams having the first wavelength; and the first wavelength laser beams are used for forming the light source beams. N is a positive integer greater than or equal to 2; and the N first wavelength lasers can work alternately under the control of a control circuit. The optical pickup device can be applied to the optical disc reading / writing device.

A method for writing voxels onto a substrate using a laser writing system includes: forming a first voxel at a first position in the substrate using a first laser pulse; detecting light emitted or scattered by the substrate as a result of the formation of the first voxel; determining whether the detected light satisfies predetermined constraints; and adjusting the amplitude of a second laser pulse if the detected light does not satisfy the predetermined constraints. The light emission or scattering from the substrate as a result of voxel formation is related to the properties of the formed voxel. By monitoring such emission or scattering, it is possible to compensate for changes in the performance of the laser writing system. A laser writing system and a computer program product implementing the method are also provided herein.

A drawing apparatus according to an aspect of the present disclosure includes a light source section and a scanning section. The scanning section irradiates a surface of the recording medium with a plurality of laser beams generated by the light source section. The light source section generates at least one laser beam among the plurality of laser beams to cause a beam shape of each of the laser beams at a position of the recording medium to satisfy a relational expression below, and to cause a length of the beam shape in a direction parallel to a scanning direction of the laser beams to be 0 degrees or more and 20 degrees or less with respect to the scanning direction of the laser beams: Ly×1.1≤Lx<Ly×5.0 d×0.8≤Ly≤d×1.3 Lx: Length of the beam shape in a direction parallel to the scanning direction of the laser beams Ly: Length of the beam shape in a direction orthogonal to the scanning direction of the laser beams d: Pixel size.

The present invention relates to a method for recording data on or in a layer of a ceramic material and to a device for recording data on or in a layer of a ceramic material.

The present invention relates to a compact writing and reading head for hyper-speed data recording on ceramic material.

One example provides a computer-implemented method for reading data stored as birefringence values ​​in a storage medium, the method including: acquiring an image of voxels of the storage medium, applying a first low-pass filter having a first cutoff frequency to the image of voxels to obtain a first background image, applying a second low-pass filter having a second cutoff frequency to the image of voxels to obtain a second background image, the second cutoff frequency being different from the first cutoff frequency, determining an enhanced background image from the first background image and the second background image, determining a birefringence value for the enhanced background image, determining a birefringence value for the image of voxels, and correcting the birefringence value for the image of voxels based on the birefringence value for the enhanced background image.

A method for writing data to a transparent substrate includes forming a first voxel by focusing a first laser pulse at a first location within the transparent substrate, and forming a second voxel by focusing a second laser pulse at a second location within the transparent substrate. The first and second laser pulses have different amplitudes, thereby resulting in first and second voxels having different intensities. A system useful for implementing this method, an optical data storage medium obtained by this method, and a method for reading data from the optical data storage medium are also provided.

Device for recording data in a layer of the ceramic material (1), the device comprising: a laser source (2) comprising a picosecond laser or a femtosecond laser; a digital micromirror device (3) that can emit multiple laser beams (4); a collimation optic for focusing the laser light emitted from the laser source onto the digital micromirror device (3); a substrate holder (6) for mounting a substrate (7); and a focusing optic (8) suitable for focusing each of the multiple laser beams (4) emitted by the digital micromirror device (3) onto a substrate (7) mounted on the substrate holder (6); wherein the fluence of each of the multiple laser beams (4) emitted by the digital micromirror device (3) is greater than 100 mJ / cm 2 is.