48results about "Optical beam guiding means" patented technology

The purpose of this disclosure is to provide a heat-assisted magnetic recording (HAMR) writer head with high magnetic field reliability and high accuracy. [Solution] Disclosed are a writer head for a heat-assisted magnetic recording device and a method for manufacturing a writer head. The writer head comprises a plurality of layers, including a waveguide cutoff layer, a waveguide layer, a near-field transducer layer, a heat sink layer, and a peg layer. Each layer has a tapered angle near the air bearing surface. The writer head further has a principal axis pole adjacent to an optical component having a similar tapered angle near the air bearing surface.

The invention discloses an optical disc device, which realizes accurate recording of user data through a recording pulse generation circuit module which forms a recording mark based on a recording code signal through a laser irradiation track. The data reading unit is used for detecting and recording a read signal of the mark from reflected light irradiated by the laser to the track, generating an equalization signal obtained by correcting the waveform of the read signal through a waveform equalization circuit module, and performing error correction on the processed equalization signal to obtain final decoding data; the method comprises the following steps of: performing convolution operation on an expected signal and a recorded coded signal through a recording condition control unit to obtain a result containing a base signal item and a squared signal item after squaring the base signal, thereby realizing stable reading of data, and realizing stable reading of the data through different noise states of reading signal amplitude corresponding to reflectivity. According to the present invention, data recorded on an optical disc can be stably read at a high linear density without reducing a linear density condition by extending a linear direction length in a cell direction or reducing the number of levels of multi-valued recording, and the like, by adjusting the size of a recording mark.

An image reproduction device 6 reproduces an image including N different parameters of a wavelength range or the like, and comprises: a multiplexed hologram acquisition unit 61 for acquiring N to 2N multiplexed holograms obtained by multiplex-recording interference patterns for each parameter; a parameter selection unit 63 for selecting the parameters one by one; a hologram generation unit 64 for generating a calculation hologram including two light waves having the selected parameters from the multiplexed holograms; and a light wave restoration unit 65 for restoring one of the two light waves from the calculation hologram.

A data protector according to an embodiment of the present disclosure includes: a data layer configured to record confidential information as a visible image; and one or a plurality of cover layers disposed at least one of above or below the data layer and configured to transition between a color-developed state and a decolored state in a visible wavelength region.

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 holographic storage optical system, relating to the field of holographic storage optics, includes: a first metasurface provided in an optical path of a S-polarized writing light beam, configured to split the writing light beam into a first polarized light and a second polarized light exhibiting an off-axis focusing characteristic; a second metasurface provided in the optical path of the second polarized light, configured to reflect the second polarized light into parallel light; a mask with a target image provided in the optical path of the parallel light; a third metasurface provided in the optical path of the second polarized light and configured to focus the parallel light after it passes through the mask; and a photosensitive material provided at an intersection of the first polarized light and the focused polarized light. The present application simplifies the construction of the holographic storage optical system.

To provide a system and a method for reducing time used for reading data stored as birefringence in a dielectric storage medium.SOLUTION: A system (800) for reading birefringent data includes: one or more light sources (802 to 806); a first polarization state generator (808) positioned to generate first polarized light from light of a first wavelength band output by the one or more light sources; second polarization state generator (810); an image sensor (822) configured to acquire an image of a sample region (814) via the first polarized light and second polarized light; a polarization state analyzer (824) disposed between the sample region and the image sensor; a first bandpass filter configured to pass light of the first wavelength band onto the image sensor; and a second bandpass filter configured to pass light of the second wavelength band onto the image sensor.SELECTED DRAWING: Figure 8

The optical disk device of the present disclosure is characterized in that a signal obtained by extracting an adjacent track component from a playback signal of a target track is generated and phase error is detected from mutual correlation with a playback signal of the adjacent track, whereby resampling is performed so that the playback signal of the target track and the playback signal of the adjacent track take on adjacent signal waveforms at the same angular position.

To provide a holographic data storage system and a method of exposing an area to a pattern over a sufficient sustaining duration (depending on an output of a beam).SOLUTION: In a method of performing a write operation in a holographic data storage system, a scheduler schedules at least one write operation across several discontinuous write intervals, and, in each of the discontinuous write intervals, a plurality of discontinuous write intervals, in which a region of a holographic recording medium is exposed to an interference pattern resulting from interference between a reference beam and an input beam carrying a set of data has a total duration sufficiently long to cause a sustained state change in the exposed region, thereby the set of data can be recovered from the region by the end of the last write interval of the plurality of discontinuous write intervals.SELECTED DRAWING: Figure 8A

A multimode optical waveguide network comprises a parent waveguide and a plurality of child waveguides. Each waveguide is a multimode optical waveguide having a first surface region, multiple second surface regions, and at least one guiding element attached to a surface of the waveguide or embedded within the waveguide, each second surface region of the parent waveguide optically coupled to the first surface region of a corresponding child waveguide. The guiding element(s) of the parent waveguide is arranged to guide a beam, from or to its first surface region, to or from any selected second surface region of its multiple second surface regions. The guiding element(s) of each of the waveguides is configurable for selecting the second surface region of that waveguide and / or responsive to at least one beam characteristic for selecting the second surface region of that waveguide via modulation of the at least one beam characteristic.

A multimode optical waveguide network includes a parent waveguide and a plurality of child waveguides. Each waveguide is a multimode optical waveguide having a first surface region, a plurality of second surface regions, and at least one guide element attached to or embedded within the waveguide surface, each second surface region of the parent waveguide being optically coupled to a surface region of the first surface region corresponding sub-waveguide. The guiding element of the parent waveguide is arranged to direct a light beam from its first surface area towards any selected one of its plurality of second surface areas, or to direct a light beam from any selected one of its plurality of second surface areas towards its first surface area. The guide element (s) of each waveguide may be configured to select the second surface area of the waveguide and / or to select the second surface area of the waveguide via modulation of at least one beam characteristic in response to the at least one beam characteristic.

A method of performing a write operation in a holographic data storage system is provided. A scheduler schedules at least one write operation across multiple non-contiguous write intervals, the write operation pertaining to data to be stored in a region of a holographic recording medium. The scheduler uses an energy estimation function, for estimating an amount of energy required to complete the at least one write operation, to perform said scheduling. In each of the non-contiguous write intervals, the region of the holographic recording medium is exposed to an interference pattern caused by interference between a reference beam and an input beam carrying the data. The multiple non-contiguous write intervals have a total aggregate duration of sufficient length to cause a persistent state change in the exposed region, such that the data is recoverable from that region within a final write interval of the multiple non-contiguous write intervals.

In an optical data transfer system, a beam modulator is configured to embed a set of data in an input beam. A multimode optical waveguide network has an in-coupling region for receiving the input beam. The multimode optical waveguide network is configured to guide the input beam to an out-coupling region of the multimode optical waveguide network. A spatial coherent detector is configured to measure a phase and an amplitude of an output optical field at multiple locations. The output optical field is at least partially defined by the input beam and thus exhibiting distortion effects caused by the passage of the beam through the multimode waveguide network. Signal processing is applied to an output of the spatial coherent detector, in order to compensate for the distortion effects, and thereby recover, from the output of the spatial coherent detector, the set of data embedded in the input beam.

A nucleic acid sequencing method comprises (a) positioning a flow cell in a flow cell imaging system. The flow cell includes a substrate and a coverslip, and the flow cell imaging system includes an optical subsystem including an immersion objective and a compensator assembly configured to selectively apply one of a plurality of pre-determined optical corrections. The acid sequencing method also includes receiving manufacturing variability data about the coverslip positioned in the flow cell imaging system, selectively applying one of the plurality of pre-determined optical corrections to the optical subsystem based on the received manufacturing variability data about the coverslip positioned in the flow cell imaging system.

A method for forming a birefringent voxel involves simultaneously generating a first seed pulse and a first data pulse. The first seed pulse and the first data pulse are spatially separated laser pulses having different amplitudes. The first seed pulse is focused to a first seed location, and the data pulse is focused to a first data location. The first seed location and the first data location are separated by a predetermined distance along the scanning path, with the first seed location being in front of the first data location. Subsequently, a second seed pulse and a second data pulse are generated and focused to a second seed location and a second data location, respectively. The second seed location and the second data location are separated by a predetermined distance. The second data location is the same as the first seed location, thereby resulting in the formation of a birefringent voxel.

To provide an optical data transfer system.SOLUTION: In a holographic storage system incorporating multi-waveguide networks, an input waveguide network includes a first input light pipe 203 to which a plurality of second input light pipes 204A, 204B are coupled. An input beam 104 from an emitter system 504 is coupled into the first input waveguide 203 through an in-coupling region thereof, and can be guided from there into the second input waveguide 204A or 204B. A reference waveguide network includes a first reference waveguide 205 to which a plurality of second reference waveguides 206A, 206B are coupled. A reference beam 106, 116 from the emitter system 504 is similarly coupled into the first reference waveguide 205, and can be guided into the second reference waveguide 206A or 206B. An output waveguide network includes a first output waveguide 207 to which a plurality of second output waveguides 208A, 208B are coupled.SELECTED DRAWING: Figure 5

In an optical data transmission system, a beam modulator is configured to embed a data set into an input optical beam. A multimode optical waveguide network has an in-coupling region for receiving the input optical beam. The multimode optical waveguide network is configured to direct the input optical beam to an out-coupling region of the multimode optical waveguide network. A spatially coherent detector is configured to measure a phase and an amplitude of an output optical field at a plurality of locations. The output optical field is at least partially defined by the input optical beam and thus exhibits distortion effects caused by the propagation of the optical beam through the multimode waveguide network. Signal processing is applied to the output of the spatially coherent detector to compensate for the distortion effects, thereby recovering the data set embedded in the input optical beam from the output of the spatially coherent detector.

An image reproduction device reproduces an image including N different parameters of a wavelength range or the like, and includes: a multiple hologram acquisition part that acquires N to 2N multiple holograms obtained by multiplex-recording interference patterns for each parameter; a parameter selection part that selects the parameters one by one; a hologram generation part that generates a computer generated hologram containing two lightwaves having the selected parameter, from the multiple hologram; and a lightwave restoration part that restores one of the two lightwaves from the computer generated hologram.

A multimode optical waveguide network comprises a parent waveguide and a plurality of child waveguides. Each waveguide is a multimode optical waveguide having a first surface region, multiple second surface regions, and at least one guiding element attached to a surface of the waveguide or embedded within the waveguide, each second surface region of the parent waveguide optically coupled to the first surface region of a corresponding child waveguide. The guiding element(s) of the parent waveguide is arranged to guide a beam, from or to its first surface region, to or from any selected second surface region of its multiple second surface regions. The guiding element(s) of each of the waveguides is configurable for selecting the second surface region of that waveguide and / or responsive to at least one beam characteristic for selecting the second surface region of that waveguide via modulation of the at least one beam characteristic.

A data protector according to an embodiment of the present disclosure includes: a data layer configured to record confidential information as a visible image; and one or a plurality of cover layers disposed at least one of above or below the data layer and configured to transition between a color-developed state and a decolored state in a visible wavelength region.

A method of performing a write operation in a holographic data storage system is provided. A scheduler schedules at least one write operation across multiple non-contiguous write intervals, the write operation pertaining to data to be stored in a region of a holographic recording medium. The scheduler uses an energy estimation function, for estimating an amount of energy required to complete the at least one write operation, to perform said scheduling. In each of the non-contiguous write intervals, the region of the holographic recording medium is exposed to an interference pattern caused by interference between a reference beam and an input beam carrying the data. The multiple non-contiguous write intervals have a total aggregate duration of sufficient length to cause a persistent state change in the exposed region, such that the data is recoverable from that region within a final write interval of the multiple non-contiguous write intervals.

To provide a holographic data storage system and a method of exposing an area to a pattern over a sufficient sustaining duration (depending on an output of a beam).SOLUTION: In a method of performing a write operation in a holographic data storage system, a scheduler schedules at least one write operation across several discontinuous write intervals, and, in each of the discontinuous write intervals, a plurality of discontinuous write intervals, in which a region of a holographic recording medium is exposed to an interference pattern resulting from interference between a reference beam and an input beam carrying a set of data has a total duration sufficiently long to cause a sustained state change in the exposed region, thereby the set of data can be recovered from the region by the end of the last write interval of the plurality of discontinuous write intervals.SELECTED DRAWING: Figure 8A

The utility model discloses a DVD (Digital Video Disk) movement with an auxiliary pressing structure, which relates to the technical field of DVD movements, and comprises a rack and a DVD optical head, an optical disk rack is arranged at the bottom of the rack in a sliding manner, a movement rack is arranged at the top of the rack, the DVD optical head is arranged in the middle of the movement rack, a bracket is arranged on the inner wall of the movement rack, and an auxiliary pressing structure is arranged on the bracket. And a motor is mounted at the top of the bracket. When the DVD movement with the auxiliary pressing structure is used, after an optical disc is pushed to the bottom of the movement frame through the optical disc frame, the motor can be started, the motor drives the lead screw to rotate through the coupler, the lead screw is in threaded connection with the connecting frame, and meanwhile the lead screw is guided by the two groups of guide columns at the top of the connecting frame, so that the movement is more stable. According to the optical disc pressing device, the screw rod can drive the connecting frame to move downwards when rotating, the connecting frame moves downwards to drive the pressing disc to move downwards, at the moment, the pressing disc can press an optical disc, and therefore the displacement condition of the optical disc can be avoided.

A method of performing a write operation in a holographic data storage system, in which schedule schedules at least one write operation across multiple non-contiguous write intervals, the write operation pertaining to a set of data to be stored in a region of a holographic recording medium. In each of the non-contiguous write intervals, the region of the holographic recording medium is exposed to an interference pattern caused by interference between a reference beam and an input beam carrying the set of data. The multiple non-contiguous write intervals have a total aggregate duration of sufficient length to cause a persistent state change in the exposed region, such that the set of data is recoverable from that region by the end of a final write interval of the multiple non-contiguous write intervals.

In an optical data transmission system, a beam modulator is configured to embed a data set into an input beam. The multimode optical waveguide network has an in-coupling region for receiving an input beam. The multimode optical waveguide network is configured to direct an input beam to an out-coupling region of the multimode optical waveguide network. The spatial coherence detector is configured to measure the phase and amplitude of the output light field at a plurality of positions. The output light field is at least partially defined by the input light beam, thus exhibiting a distortion effect caused by the light beam passing through the multimode waveguide network. Signal processing is applied to the output of the spatial coherence detector to compensate for distortion effects to restore the data set embedded in the input beam from the output of the spatial coherence detector.

To enable the light intensity of a three-dimensional light distribution to be modulated to a desired value in a technique of generating the three-dimensional light distribution based on a phase distribution image, irrespective of a mode of the three-dimensional light distribution to be generated.SOLUTION: A light distribution generator comprises: a spatial light modulator 5 capable of modulating the phase distribution of light; a light source unit 1 for emitting light to illuminate the spatial light modulator 5; a light intensity modulation unit 6 capable of modulating the intensity of light emitted from the light source 1; and a signal processing unit 7 for transmitting an indication signal pertaining to mode information of a phase distribution image to the light intensity modulation unit 6 so that the intensity of light emitted from the light source unit 1 can be modulated based on the mode information of the phase distribution image by the light intensity modulation unit 6 in synchronism with display timing of the phase distribution image to the spatial light modulator 5. The light distribution generator is constituted so that a three-dimensional light distribution 8 having the desired intensity is dynamically generated at a position away by a prescribed distance from the spatial light modulator 5 on the basis of the mode of the phase distribution image displayed on the spatial light modulator.SELECTED DRAWING: Figure 1

To establish a configuration of a compact objective lens that is less likely to be damaged, is achromatized in an oscillation wavelength of a laser, has high NA, and can take a wide viewing angle equally to that of a normal microscope.SOLUTION: An objective lens 1 is composed of nine lenses of a first lens to a ninth lens arranged in order from an enlargement side. The first lens L1 is formed of a meniscus lens having negative refractive power. The second lens L2 is formed of a biconcave lens. The third lens L3 is formed of a meniscus lens having positive refractive power. The fourth lens L4 is formed of a biconvex lens. The fifth lens L5 is formed of a meniscus lens having negative refractive power. The sixth lens L6 is formed of a biconvex lens. The seventh lens L7 is formed of a lens with an arbitrary shape having positive refractive power. The eighth lens L8 is formed of a meniscus lens having positive refractive power. The ninth lens L9 is formed of a meniscus lens having positive refractive power. The objective lens 1 does not include a cemented lens, has a numerical aperture larger than 0.75, and has a half viewing angle of 2.5° or more. A thickness of the ninth lens L9 is 1.5-3 times a focal length of the objective lens 1.SELECTED DRAWING: Figure 1

1. A system comprising: an actuator; a signal generator configured to apply an electrical signal to the actuator to extend or shorten the actuator; an optical fiber associated with the actuator, the optical fiber configured to lengthen when the actuator extends and to shorten when the actuator contracts; and a coherent light source configured to send coherent light through the optical fiber to provide illumination during lengthening and shortening of the optical fiber.