64results about "Optical beam sources" patented technology

The invention discloses a method for improving optical storage capacity based on ultraviolet femtosecond laser multi-cycle low-temperature direct writing, and belongs to the technical field of laser processing. Leveling the sample table; designing a random data structure and calculating parameters; preparing a random data structure; reading and characterizing a random data structure; according to the method, firstly, ultraviolet femtosecond laser with the wavelength of 343 nm is used for replacing infrared / visible band laser used in traditional five-dimensional optical storage, secondly, a multi-cycle scanning mode is used for replacing an existing scanning mode, and birefringence modification with the smaller size is induced in quartz glass at low temperature; the tiny birefringence modification is used for realizing data writing and reading of the optical memory with higher storage density; according to the multi-cycle scanning mode, heat accumulation in the machining process is affected by changing single-point one-way acting time, so that the dot spacing is shortened, and the storage capacity is increased.

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

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.

A system for analyzing laser beam characteristics in high-speed laser motion systems, wherein the high-speed laser motion systems comprise multiple lasers each having a field of view that generates non-stationary laser beams and a build platform positioned at a predetermined location relative to the non-stationary laser beams, comprising at least one mounted pin-hole sensor that receives laser light generated by the non-stationary laser beams; an actuation device that includes either: the at least one pin-hole sensor; or an optical device that directs the laser light to the at least one pin-hole sensor; and wherein the actuation device is actuated into an operating environment above the build platform.

The effective coherence length of a single-frequency, solid-state laser is limited to reduce spurious, secondary holograms in conjunction with a holographic recording. The wavelength of the laser is varied or 'scanned' with high precision over a very small wavelength range. In an embodiment, the temperature of the laser's resonant cavity optical bench is altered, causing the dimension of the cavity to change and the emission wavelength to move in a controlled manner. The changing wavelength is monitored at high resolution, and a feedback control loop updates the temperature set-point to keep the monitored laser wavelength moving at a desired rate of change through a desired range. As the wavelength of the laser is scanned, the phase of the holographic interference pattern is locked at a position of maximum coherence / contrast within the holographic film aperture.

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.

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.

The embodiment of the invention provides an optical pickup and an optical disc read-write device, relates to the technical field of optical disc read-write, and aims to solve the problem that the service life of the optical pickup and the service life of an optical disc driver are limited by the service life of a laser. The optical pickup comprises a light source part and an action part, wherein the light source part is used for generating a light source beam projected to the action part; and the action part is used for receiving the light source beam and performing data reading and writing on the optical disk by using the light source beam. At least part of wavelength in the light source beam 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 of the first wavelength, and the first wavelength laser beams are used for forming the light source beam. Wherein N is a positive integer greater than or equal to 2; the N first wavelength lasers can work alternately under the control of the control circuit. The optical pickup can be applied to an optical disc read-write device.

A thermal medium and a laser recording device are provided in which medium parameters can be acquired efficiently. According to one embodiment, the thermal medium includes a photothermal conversion layer, a color development layer, a storage mechanism. The photothermal conversion layer converts an applied laser beam into heat. The color development layer develops a color by the heat converted by the photothermal conversion layer. The storage mechanism stores information related to a medium parameter including a photothermal conversion efficiency of the photothermal conversion layer.

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.

A method of writing voxels to a substrate using a laser writing system comprises forming a first voxel at a first position in a substrate using a first laser pulse; detecting light emitted or scattered by the substrate as a result of forming the first voxel; determining whether the detected light satisfies a predetermined constraint; and, when the detected light does not satisfy the predetermined constraint, adjusting an amplitude of a second laser pulse. Light emission or scattering from the substrate as a result of forming a voxel is related to the properties of the formed voxel. By monitoring such emission or scattering, it is made possible to compensate for variations in performance of the laser writing system. Also provided herein are a laser writing system and computer program product which implement the method.

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.

The invention discloses a magnetic skyrmion forming method and writing device based on femtosecond laser pulse regulation and control. The method comprises the following steps: acquiring a CoFeB nano-disk and placing the CoFeB nano-disk in a sample placing area of a magneto-optical Kerr effect microscope; pulse excitation is carried out on the CoFeB nanodisk by adjusting femtosecond laser thermal pulses, generation and annihilation of the Skyrmion of the CoFeB nanodisk in a preset area are controlled, and the number and position of the Skyrmion are obtained; and writing and reading data according to the generation and annihilation of the Skyrmion and the number and position of the Skyrmion. The device comprises a femtosecond laser pulser, a CoFeB nanodisk and a temperature sensor. According to the embodiment of the invention, the energy consumption can be reduced, the interference of external noise is avoided, and the precise control capability of the number and position of the skyrmion is improved. The method can be widely applied to the technical field of spintronics.

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 proposes a super-resolution three-dimensional optical storage focusing servo device and a servo method thereof. The device integrates a light source shaping module, a beam combining module, a zoom layer selection module, a servo signal detection module and a drive control module. The coaxial recording light is formed by combining solid excitation light and hollow suppressed light, and the servo guide layer reflects the signal generated by the solid servo light to control the axial movement of the servo objective lens and the recording objective lens, and the double beam center alignment is always maintained during the reading and writing process to achieve high-speed nano-focusing servo. No additional servo light source is required, and the focus of the double beam is adjusted in real time to maintain three-dimensional alignment, surpassing the diffraction limit and improving the storage density. Combined with the lens group to compensate for aberrations and zoom layer jump, ultra-high density storage of hundreds of layers is achieved. The device has a simple structure, convenient operation, good compatibility, and is applied to the field of super-resolution three-dimensional optical storage, with broad application prospects.

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.

Disclosed are a hologram reading device and a hologram reading method, the hologram reading device including a hologram element having a hologram pattern, a detector configured to detect a reflection beam generated in the hologram pattern, and a controller connected to the detector and configured to read information the hologram pattern using a detection signal of the reflection beam, wherein the hologram pattern may have the width or diameter smaller than 225 nm.