12results 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.

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 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.

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.

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.

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.

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.

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

A holographic data storage system comprises an emitter system, a holographic recording medium and an input waveguide network formed by one or more multimode optical waveguides. The holographic recording medium has a plurality of recording regions, each recording region being optically coupled to a corresponding out-coupling region of a plurality of out-coupling regions of the input waveguide network, the holographic data storage system being arranged to durably write data of an input light beam received at any one out-coupling region to the corresponding recording region. A controller is coupled to at least one of the emitter system and at least one controllable steering element of the input waveguide network and controls at least one optical property of the input light beam or at least one steering element in order to direct the input light beam from the in-coupling region to any selected out-coupling region of the plurality of out-coupling regions. Similar waveguide networks are provided to carry reference light beams and output light beams.

A holographic data storage system includes a transmitter system, a holographic recording medium, and an input waveguide network formed of one or more multimode optical waveguides. The holographic recording medium has a plurality of recording areas, each recording area optically coupled to a corresponding one of the plurality of out-coupling areas of the input waveguide network, the holographic data storage system being arranged to persistently write data of the input beam received at any one of the out-coupling areas to the corresponding recording area. A controller is coupled to at least one of the emitter system and the at least one controllable guiding element of the input waveguide network and controls at least one optical characteristic of the input light beam or the at least one guiding element so as to guide the input light beam from the in-coupling region to any selected out-coupling region of the plurality of out-coupling regions. Similar waveguide networks are provided to carry a reference beam and an output beam.