60 results about "Information optics" patented technology

The invention relates to an image-formation optical system that satisfies demands toward high performance and compactness at the same time, and an imaging system incorporating the same. The image-formation optical system comprises, in order from its object side, an aperture stop S, a first positive meniscus lens L1 convex on its object side, a second positive lens L2 having an aspheric surface and a third negative lens L3 having an aspheric surface, and satisfies the following condition.

0.95<Σd/f<1.25  (1)

Here Σd is the distance on an optical axis of the image-formation optical system from the object side-surface of the first positive meniscus lens to the image plane side-surface of the third negative lens, and f is the focal length of the image-formation optical system.

An apparatus for displaying images represented by electronic image information, that includes a light source and a reflective light modulator for optically modulating, with the image information, light from the light source to obtain a diffraction pattern that depends on the image information. An optical system is provided for converting the diffraction pattern into an image, and projection optics are provided for projecting the image obtained with the optical system. The optical system includes an array of schlieren bars and a focusing reflector.

An optical storage apparatus, using the near field optical effect, performs tracking along a track of a recording medium to reproduce information recorded on the recording medium without error. The optical storage apparatus includes a first probe to read information recorded on the recording medium and at least two to judge if the track direction of the recording medium is in accordance with the information scanning direction of the first probe. The apparatus also includes a probe actuator to adjust the tracking direction of the first and second probes using a tracking control signal, and a number of sensors to sense the intensity of radiation probed by the first and second probes and to generate tracking signals corresponding to the sensed radiation. The apparatus also includes a controller to generate a tracking control signal using the tracking signals, and to provide the tracking control signal to the probe actuator.

A Bessel-Gaussian beam mask plate based on the Mittag-Leffler function uses the information optics principle and combines the Mittag-Leffler modulation function, the Bessel-Gaussian beam and the plane wave complex amplitude to obtain the interference light intensity graph to realize the interference recording process of the holographic principle. The interference light intensity graph is the mask plate designed for the invention. The invention has the beneficial effects that the invention provides the Bessel-Gaussian beam mask plate based on the Mittag-Leffler function, which can produce the pattern distribution of any number of optical flaps and has important application value in the fields of multi-particle capturing and the like.

The invention belongs to the field of information optics and relates to a method for adjusting the self-collimation of an interference optical path in a holographic grating lithography system to solvethe poor parallelism of exposure beams when a parallel equidistant stripe holographic grating is fabricated. A volume Bragg grating is placed behind a collimating lens. The incident angle of the exposure beam emitted to the volume Bragg grating is equal to the Bragg angle of the volume Bragg grating. A photoelectric detector is placed on an -1 grade transmission diffraction optical path after theexposure beam is emitted to the volume Bragg grating. A pinhole filter is moved forwards and backwards along an optical axis to observe the readings of the photoelectric detector in real time. When the photoelectric detector has a maximum reading, the pinhole filter is fixed and the distance between a first pinhole filter and a first collimating lens is kept constant. The method for adjusting theself-collimating optical path detects the parallelism of self-collimated light by using the volume Bragg grating, substitutes for a traditional Moire fringe adjustment method, is easy to operate andhas a good practical value.

Disclosed is a photonic orbital angular momentum spiral spectrum measurement system based on Fourier transform. The photonic orbital angular momentum spiral spectrum measurement system based on the Fourier transform relates to the technical field of information optics, and aims at solving the problem that existing spiral spectrum measurement methods are high in complexity and cost. According to the system, a light beam is divided into two lights by a first unpolarized beam splitter, one is transmission light, the other is reflected light, each light path is provided with a Dove prism, the transmission light and the reflected light are reflected by a total reflection mirror to reach a second unpolarized beam splitter, and phases of the transmission light and the reflected light are the samein the second unpolarized beam splitter; two interference lights output by the second unpolarized beam splitter are received by receiving end faces of two photodetectors respectively, and two intensity signals output by the photodetectors are transmitted to a synchronous signal processing system; an orbital angular momentum spiral spectrum is calculated by the synchronous signal processing systemaccording to the synchronously collected intensity signals. The system is applicable to spiral spectrum measurement of echo signals after target detection is performed by adopting the orbital angularmomentum light beam.

The invention belongs to the technical field of information optics, and relates to a holographic interference photoetching system. In order to solve the problem that the interference fringe drift holographic grating contrast ratio decreases, a first high-speed photoelectric detector is utilized to acquire a moire fringe light intensity signal on the surface of a reference grating, and transmit thelight intensity signal to a single chip computer and a PID controller at the same time; a second high-speed photoelectric detector monitors a light intensity signal of a laser through a light beam sampling grating, the light intensity signal is transmitted to the single chip computer, and a signal output end of the PID controller transmits to a frequency modulation input end of a first ultrasonicgenerator; and when the PID controller judges that the light intensity signal detected in real time by the first high-speed photoelectric detector changes, the PID controller outputs a feedback signal to the first ultrasonic generator, the frequency of the first ultrasonic generator changes correspondingly, the phase of the -1 level diffraction light of a first acoustic optical modulator changes,accordingly the phase of the moire fringe is locked, and locking of the interference fringe phase is achieved.

The invention discloses an X-ray optical framing imaging system that comprises a super-continuum spectrum generation module, a super-continuum spectrum broadening module, a probe light action module and an optical framing recording module, wherein the super-continuum spectrum generation module can convert short-pulse laser into super-continuum spectrum probe light; the super-continuum spectrum broadening module can convert the super-continuum spectrum probe light into chirped pulse probe light; the probe light action module can enable chirped pulse probe light to carry space-time evolution process information of X-rays generated by interaction of targeting laser and a target material, and the optical framing recording module can spatially divide one beam of chirped pulse probe light into aplurality of beams and record the beams of chirped pulse probe light as a plurality of two-dimensional images with time intervals. By adopting the technical scheme, the invention can be used for measuring the X-ray space-time evolution process under the conditions of an extremely small space and an extremely short time scale, and serves the research of a high-energy density related physical process.

A deterioration of reproduction light is occurred by a laser drive current on which a high-frequency current is superimposed. The present invention, for example, is an optical information reproducing apparatus which irradiates a laser beam to an optical disc 1 and reads an information, the optical information reproducing apparatus includes a semiconductor laser 6 which generates the laser beam, a laser drive unit 7 which supplies a drive current on which a high-frequency current are superimposed to the semiconductor laser 6, a spindle motor 2 which drives the optical disc 1 and a control unit 5 which controls the laser drive unit 7 and the spindle motor 2, and the control unit 5 determines a parameter of the high-frequency current based on magnitude of a current on which the high-frequency current is to be superimposed.