104results about "Optical beam sources" patented technology

A method of writing data to a transparent substrate comprises forming a first voxel by focusing a first laser pulse on a first location in a transparent substrate; and forming a second voxel by focusing a second laser pulse on a second location in the transparent substrate. The first laser pulse and the second laser pulse have different amplitudes, resulting in the first and second voxels having different strengths. Also provided are a system useful for implementing the method; an optical data storage medium obtainable by the method; and a method of reading data from the optical data storage medium.

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 invention provides 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 zooming layer selection module, a servo signal detection module and a driving control module. The solid excitation light and the hollow suppression light are combined to form coaxial recording light, the servo objective lens and the recording objective lens are controlled to move axially by using a signal generated by reflecting the solid servo light by the servo guide layer, and the centers of double light beams are always kept aligned in the read-write process, so that high-speed nano focusing servo is realized. An additional servo light source is not needed, double-beam focuses are adjusted in real time to keep three-dimensional alignment, the diffraction limit is exceeded, and the storage density is improved. The lens group is combined to compensate aberration, zoom and skip layers, so that hundred-layer ultra-high-density storage is realized. The device is simple in structure, convenient to operate and good in compatibility, is applied to the field of super-resolution three-dimensional optical storage, and has a wide application prospect.

A data storage device includes a laser diode that heats an area of a disk near the read / write head. To mitigate mode hopping, the laser diode is preheated using the laser diode itself, such as by applying a reverse bias to the laser diode, during an interruption in writing of data to the disk. The laser diode is preheated to a temperature that maintains operation of the laser diode within a middle portion of a preselected gain mode and away from abrupt shifts in gain modes.

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.

The present invention discloses an aberration compensation method and device, the method comprising: step S1, compensating and superimposing a conjugate wavefront aberration phase on an initial input phase to obtain a pre-compensated phase; step S2, superimposing the pre-compensated phase through the wavefront aberration phase distortion of an optical element itself to obtain a compensated phase, and subjecting the compensated phase to Fourier transformation to obtain aberration-compensated Fourier surface intensity; the aberration-compensated Fourier surface intensity information has a low bit error rate and a good reconstruction effect; it is a numerical compensation method without the need to add additional optical components; thereby reducing the number of optical elements used in an optical system and reducing the complexity of the optical system, providing good technical support for aberration compensation in, for example, the field of holographic storage, and having good application prospects in, for example, the field of holographic data storage research; it can be applied to the fields of holographic storage, biomedical image processing, digital holographic microscopy, etc.

A single-servo-layer multi-recording-layer optical disc drive, a memory, and an electronic device. A dichroic mirror is provided in the optical disc drive. A light beam of a first light source is projected on the surface of one side of the dichroic mirror and then is reflected to a recording medium of an optical disc to read and write data. A light beam of a second light source may directly transmit through the dichroic mirror and be transmitted to a servo layer of the recording medium of the optical disc. The dichroic mirror can be fixed in the optical disc drive by means of a movable assembly. The movable assembly can change the orientation of the dichroic mirror to adjust the relative position between a propagation direction of the light beam of the first light source and a propagation direction of the light beam of the second light source, so as to eliminate errors generated in the processes of installation, use and the like of the optical disc drive. The optical disc drive of the present application has the advantages of small internal structure change, simple implementation process, high control precision and the like, and the effect that while accurate servo of the light beam of the second light source in the servo layer is implemented, the light beam of the first light source is projected to a data track center of each recording layer of the optical disc is realized at low costs.

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.

This application relates to the field of optical storage technology and discloses a system and method for reading and writing data. The method can be used to increase the read / write speed of optical storage without increasing the rotation speed of the optical storage medium. The system includes an optical deflector and a read / write optical head. The optical deflector is configured to sequentially deflect a first optical signal through multiple angles to obtain multiple second optical signals. The read / write optical head is configured to receive the multiple second optical signals and separately focus the multiple second optical signals onto the optical storage medium to read and write multiple data points.

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.

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.

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 is applied to the field of optical storage. Provided is an optical pickup. The optical pickup comprises a first laser, a first collimating lens, an intermediate lens group, a first detector, and a focusing lens, wherein the first laser is used for generating a first light beam and transmitting the first light beam to the first collimating lens; the first collimating lens is used for transmitting the first light beam to the focusing lens through the intermediate lens group; the focusing lens is a binary optical element; the focusing lens is used for transmitting the first light beam to an optical recording medium and receiving a reflected light beam of the first light beam from the optical recording medium; the focusing lens is further used for transmitting the reflected light beam of the first light beam to the first detector through the intermediate lens group; and the first detector is used for converting the reflected light beam of the first light beam into a first electrical signal. In the technical solution provided by the present application, by means of using a binary optical element as the focusing lens, the sag of the focusing lens can be reduced, and thus the size of the optical pickup can also be reduced.

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 disclosure relates to a method for encoding information by valley polarization in a material using an electromagnetic field. The method comprises the steps of providing a material, and applying the electromagnetic field onto the material, wherein the electromagnetic field possesses an m-fold symmetry and the real-space lattice structure or real-space sub-lattice structure of the material possesses an n-fold symmetry, wherein the symmetry of the electromagnetic field corresponds to the symmetry of the real-space lattice structure or real-space sub-lattice structure of the material in such a way that n is an integer multiple of m, and wherein the electromagnetic field induces and / or manipulates valley polarization in the bandstructure of the material. The present disclosure further provides a device for generating an electromagnetic field suitable for inducing and / or manipulating valley polarization in a multilayer material.

A heat-assisted magnetic recording head includes a laser, a near-field transducer, a primary waveguide, a secondary waveguide, and a photodiode. The laser is configured to emit electromagnetic radiation. The near-field transducer is configured to focus and emit an optical near-field. The primary waveguide configured to receive the electromagnetic radiation and propagate the electromagnetic radiation toward and proximal to the near-field transducer. The secondary waveguide configured to receive a portion of the electromagnetic radiation from the primary waveguide. The photodiode configured to receive the portion of the electromagnetic radiation from the secondary waveguide and emit a signal that represents a magnitude of the electromagnetic radiation that the laser emits.

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 data reading and writing device and a data reading and writing method, wherein, in the data reading device or the data writing device, an optical head array including multiple laser heads is provided to increase the number of laser heads used for data reading and writing, and each laser head is improved and multiple focal points are provided in each laser head. In this way, in a data reading and writing process, parallel reading and writing of multiple data can be realized through the multiple laser heads and the multiple focal points in the laser heads, and the data reading and writing throughput of the optical storage medium can be improved.

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.