254 results about "Beam coupling" patented technology

An optical instrument including: a thermo-optically tunable, thin film, free-space interference filter having a tunable passband which functions as a wavelength selector, the filter including a sequence of alternating layers of amorphous silicon and a dielectric material deposited one on top of the other and forming a Fabry-Perot cavity structure having: a first multi-layer thin film interference structure forming a first mirror; a thin-film spacer layer deposited on top of the first multi-layer interference structure, the thin-film spacer layer made of amorphous silicon; and a second multi-layer thin film interference structure deposited on top of the thin-film spacer layer and forming a second mirror; a lens for coupling an optical beam into the filter; an optical detector for receiving the optical beam after the optical beam has interacted with the interference filter; and circuitry for heating the thermo-optically tunable interference filter to control a location of the passband.

A ring-laser system that includes a plurality of ring-laser gain elements and a spectral-beam-combining output stage configured to combine a plurality of beams coming from the gain elements into an output beam and that includes chromatic-dispersion compensation. In some embodiments, the output stage includes a plurality of highly reflective dielectric-coated focussing elements. In some embodiments, the output stage includes a plurality of high-efficiency dielectric-coated grating elements. In some embodiments, the output stage includes a mostly reflective but partially transmissive output mirror and a highly reflective beam-reversing mirror configured to reflect a majority of a backward-traveling signal beam such that it becomes forward traveling. In some embodiments, each gain element further includes a photonic-crystal-rod power amplifier. Some embodiments have an amplitude modulator configured to pulse the plurality of beams, and a timing controller configured to synchronize the pulses of the plurality of beams. Some embodiments further include a non-linear wavelength-conversion device.

Techniques for increasing the spatial and spectral brightness of laser arrays such as laser diode arrays are provided. Passive cavity designs are described that produce wavefront phase locking across the face of large arrays. These designs enable both spatial and spectral selectivity in order to coherently link the individual emitters that make up the diode array. Arrays of customized micro-optics correct aberrations of the individual apertures of the arrays while highly spectrally selective partial reflectors overcome the deleterious effects of inhomogeneities in local thermal environments of the individual emitters that are being phase locked together. Using these two technologies, along with intracavity diffractive beam coupling, solves two long standing problems that have prevented effective and robust phase locking of laser diode arrays.

Laser projection system suitable for commercial motion picture theaters and other large screen venues, including home theater, uses optical fibers to project modulated laser beams for simultaneously raster scanning multiple lines on screen. Emitting ends of optical fibers are arranged in an array such that red, green and blue spots are simultaneously scanned onto the screen in multiple lines spaced one or more scan lines apart. Use of optical fibers enables scanning of small, high resolution spots on screen, and permits convenient packaging and replacement, upgrading or modification of system components. Simultaneous raster scanning of multiple lines enables higher resolution, brightness, and frame rates with available economical components. Fiber-based beam coupling may be used to greatly enhance the flexibility of the system. Alternate embodiments illustrate the flexibility of the system for different optical fiber output head configurations and for different types, sizes, and arrangements of laser, modulation, and scanning components.

The invention relates to a sensing unit in a sensor system used for detecting the air concentration in the environment. The sensing unit comprises: an optical head which comprises a cylindrical hollow part with openings on the two ends and a collimator arranged in the cylindrical hollow part, wherein, one end of the cylindrical hollow part is connected with optical fiber; a column cylinder, one end of which is coupled with the other end of the optical head; a plurality of stomas which are formed on the lateral wall of the column cylinder; at least one reflecting device which is arranged in the column cylinder and is used for reflecting beams to lead to the result that the beams emit and enter the fiber again through the collimator. The beams transmitted by the fiber are coupled in the column cylinder through the collimator to cause that the beams are parallel with the axial direction of the column cylinder. The sensing unit also comprises the sensor system used for detecting the air concentration in the environment and a method using the sensor system for detecting the air concentration in the environment.

The invention discloses a suspension type monorail vehicle dynamic model and a vehicle-bridge coupling power simulation method, belongs to the technical field of rail traffic and aims to solve the technical problem that an existing suspension type monorail dynamics simulation device is large in simulation result errors during rail beam local vibration research. By providing the suspension type monorail vehicle system dynamic model, a rubber wheel-rail surface contact mechanical model, a rail beam bottom plate and web equivalent surface force application method and a vehicle and rail beam coupling dynamic model building method, a suspension type monorail vehicle-rail beam coupling dynamic simulation system is built. By the model, the system and the method, suspension type monorail vehicle system suspension mechanism decoupling and equivalent treatment are achieved, and the technical problems that the existing suspension type monorail dynamics simulation device is large in simulation result errors during the rail beam local vibration research, rail beam dynamic stress and strain results are hard to extract, rail beam local strength destroying cannot be evaluated accurately and the like are solved.

Methods of transmitting an optical signal through optical fiber in a manner suppressing stimulated Brillouin scattering (SBS) are provided. A light beam emitted from a light source is modulated by driving either the light source or a separate phase modulator or both simultaneously with a separate high frequency signal dithered by one or more low frequency dithering signals of a frequency or frequencies lower than that of the high frequency signal. Thereafter, the light beam is further modulated externally with an RF information-carrying signal. The high frequency signal is at least twice a highest frequency of the RF information-carrying signal. The light beam modulated with the RF information-carrying signal is coupled into optical fiber. The high frequency signal dithered by the one or more low frequency dithering signals spreads the optical power of the light beam in a wider spectral range thereby raising the SBS threshold power level for purposes of suppressing SBS while the undesired induced spurious frequency component level is controlled. The form of the spread spectrum is also controlled and adjusted. An optical transmitter is also disclosed.

A coupling technique for the side coupling of light from a light source into a waveguide is provided. A transversal groove is made into a section of the waveguide, extending into the target light guiding region. A coupling element is coupled to the light source at one of its end to receive the light beam therefrom. The opposite end of the coupling element is inserted in the groove and has at least one reflecting interface which specularly reflects the light beam for propagation into the waveguide. This technique may advantageously be used to couple light from the laser diodes of an array into one or a plurality of optical fibers.

The equipment for monitoring micro circulation body flow time-space response characteristic on mesentery includes an optical path and an imaging system. In the optial path, the laser bean from helium neon laser is coupled to fiber bundle to form homogeneous diffused beam; and the imaging system consists of stereo microscope with CCD camera, image collecting card with image collecting and controlling software. The CCD signal is output to the image collecting card connected to PC, the collection parameters are set via the image collecting and controlling software and local blood flow information are obtained with the image signal and via the signal analysis software. The equipment provides one new way to the research of influence of medicine and other stimulation to the micro circulation blood flow on mesentery.

The invention relates to a light waveguide. The light waveguide includes a light waveguide body, wherein the light waveguide body includes a beam coupling-in region and a beam coupling-out region, thebeam coupling-in region is provided with a coupling-in grating and configured to couple a beam into the light waveguide body and make the beam propagate in the light waveguide body in a totally reflective manner, the beam coupling-out region is provided with a coupling-out grating, is configured to couple the beam propagated to the beam coupling-out region out of the light waveguide body and makes the beam not undergo secondary diffraction at the coupling-in the grating and has a continuous expansion exit pupil, and the coupling-out grating includes a transmissive coupling-out grating and a reflective coupling-out grating disposed on two sides of the light waveguide body parallel to the beam propagation direction. The invention further relates to a display device. Through arranging the transmissive coupling-out grating at the light outgoing surface of the light waveguide body and the reflective coupling-out grating on the first surface, the continuous expansion exit pupil can be obtained while the beam is guaranteed not undergo secondary diffraction at the coupling-in the grating.

A process for the fabrication of a photonic crystal (and the crystal produced thereby) comprising producing a first beam of coherent light; generating a second and a third beam of coherent light each in a fixed phase relationship with the first beam; aligning the beams of coherent light so as to form a fixed relative angle of incidence between each pair of beams and to form an evanescent light interference pattern grid on a substrate having a first electrostatic charge; introducing into the evanescent light interference pattern grid a substance having a second electrostatic charge of an attractive nature to the first electrostatic charge; positioning the substance with the second electrostatic charge using the evanescent interference pattern grid in a planned manner on the substrate so as to form a photonic crystal. An apparatus for fabricating a photonic crystal is provided comprising a sample cell having a first electrostatic surface charge; a coherent light source operatively configured to generate a first beam of coherent light; at least one beam splitter optically coupled to the coherent light source for generating at least a second and a third beam of coherent light from the first beam of coherent light; at least one reflector in alignment with the beam splitter so as to receive the first, second and third beams of coherent light, said reflector operatively configured to align said first, second and third beams so as to form a relative angle of incidence between each pair of beams of approximately 120 degrees and to form an evanescent light interference pattern grid on said sample cell; which pattern gild can be used to position particles of a second electrostatic surface charge on the sample cell.

The invention belongs to the field of laser technology application, and provides a diode laser beam collimation method. A laser beam emitted by a diode laser is collimated by a convex cylindrical lens, a concave cylindrical lens and a convex lens in turn, and then is emitted into the atmosphere. The laser beam along the fast axis direction firstly passes through the convex cylindrical lens and is collimated into parallel light. Through the concave cylindrical lens, the beam in the fast axis direction is diverged again. The fast axis divergence angle of the output laser beam matches the receiving angle of the convex lens, which greatly improves the coupling efficiency of the fast axis laser beam. The size and divergence angle of a laser beam along the slow axis direction are not changed. The fast axis is placed perpendicular to the Scheimpflug plane. The slow axis is placed parallel to the Scheimpflug plane. Finally, the fast and slow axis laser beams are collimated by the convex lens and emitted into the atmosphere. According to the technical scheme provided by the invention, the coupling efficiency of the emitted light beams is improved under the condition of the same performance of the SLidar system.

The invention discloses a multi-wavelength line-scanning Raman spectrometer. The Raman spectrometer comprises a laser light source, a focusing objective lens, a first diffraction grating, a long-wave-pass optical filter group and a spectrum collection unit, wherein the laser light source comprises a laser device, a beam coupling system and an attenuation piece and is used for outputting exciting light to a sample; the focusing objective lens and the first diffraction grating are used for realizing the transverse line scanning of the Raman spectrometer to the sample; the long-wave-pass opticalfilter group is used for filtering out exciting light output by the laser light source; and the spectrum collection unit comprises a lens group, a second diffraction grating and a CCD and is used forcollecting and processing Raman light scattered on different transverse positions of the sample. By combining the diffraction gratings with a focusing lens, the line distribution of light of differentwavelengths on the cross section of the sample is realized, and the transverse line scanning of the Raman spectrometer to the sample is realized, so that the line scanning based on a displacement platform is avoided, and the dimension of a system is reduced; and by demodulating spectra with close wavelengths, the fluorescence background of the sample can be removed, and the accuracy of a detection result can be improved.

A nonlinear Yb:YAB laser material is disclosed. The material is capable of generating fundamental o-polarized first wavelength laser light and frequency doubled e-polarized second wavelength laser light, the material being oriented for type 1 phase matching of the first wavelength laser light. Also disclosed is a laser system. The system comprises a pumping light source emitting a pumping beam of light, a laser cavity having an input coupler operatively disposed with respect to the light source so as to couple the pumping beam of light into the cavity, and a nonlinear Yb:YAB laser material capable of lasing in response to a pumping beam of light thereby generating fundamental o-polarized first wavelength laser light and frequency doubled e-polarized second wavelength laser light, the material being oriented for type 1 phase matching of the first wavelength laser light, the first wavelength laser light being in the range of 1020-1100 nm and the second wavelength laser light being in the range of 510-550 nm. The input coupler comprises a reflector to at least partially reflect the first wavelength laser light and the second wavelength laser light into the cavity, and the laser cavity further includes an output coupler for coupling and outputting at least the second wavelength laser light from the cavity as an output laser beam. Also disclosed are methods of providing an output laser beam and methods of using the beam.

The invention discloses a space-borne microwave and laser communication link integrating system and an application method. The integrating system comprises a laser, light amplifiers, a convergent lens, a light beam controller, an optical antenna, a photoelectric detector, a microwave / light demodulator, a light / microwave demodulator, a multiplexer, an electricity amplifier and a radio frequency antenna. The application method includes that a digital signal is modulated to a light area via the laser; an optical signal is coupled to the optical antenna for transmitting via light beam coupling; the optical signal is received and coupled to the photoelectric detector by the optical antenna; the optical signal is received by the optical antenna, processed by the light beam controller, coupled to the light / microwave demodulator, and converted into a microwave signal, the microwave signal is amplified by the electricity amplifier and coupled to the radio frequency antenna for transmitting; the microwave signal is received by the radio frequency antenna, amplified by the electricity amplifier and input to the multiplexer to realize microwave signal combination, then is modulated to the light area via the microwave / light demodulator; and finally the combined signal is coupled to the optical antenna for transmitting via the light beam controller. The space-borne microwave and laser communication link integrating system is small in size, low in energy consumption, and can be widely used in military and civil space-borne communication industry.

A frame supports a display apparatus against the head of a viewer. A projector fitted within the frame generates a beam of image-bearing light. A light guide coupled to a forward section of the frame has a waveguide, an in-coupling diffractive optic formed on the waveguide for directing image-bearing light beams into the waveguide, a turning optic formed on the waveguide for expanding the respective image-bearing light beams from the in-coupling diffractive optic in a first dimension, and an out-coupling diffractive optic formed on the waveguide for expanding the respective image-bearing light beams in a second dimension orthogonal to the first dimension and forming a virtual image within a viewer eyebox. A mount supports the light guide in front of the viewer and provides a hinge for angular adjustment of the waveguide with respect to the projector.

The invention belongs to the radar signal processing technology field and discloses a target parameter estimation method based on an FDA-MIMO radar. The method comprises the following steps of designing a frequency increment resulting in wave beam coupling and an array element spacing, breaking linearly increasing synchronization between the two, achieving a decoupling effect, and providing a condition for unique estimation of a target distance angle; and through designing, making the frequency increment of each array element satisfy a sinc function increasing relation, and then carrying outangle and distance estimation to obtain an accurate target angle and distance information. By using the method of the invention, coupling of an emission wave beam at a distance-angle can be solved. When the distances and the angles of multiple targets are different, the distance and the angle of the target is well estimated to avoid occurrence of false targets, and estimation performance of the radar is improved.

A semiconductor laser oscillator includes laser diode modules. A temperature sensor directly or indirectly detects a temperature of at least one of the laser diode modules. A collimating lens collimates respective lasers emitted from the laser diode modules. A grating performs spectrum beam coupling for the lasers emitted from the collimating lens. An incident angle varying mechanism changes incident angles of the respective lasers, at which the lasers emitted from the collimating lens are incident onto the grating in response to the temperature detected by the temperature sensor.

A resonator cavity (10A) and method and presented. The resonator cavity (10A) comprises at least one gain medium (16) and end reflectors (12, 14) which define together longitudinal modes of light in the cavity, and further comprises an intra-cavity beam coupler assembly (20). The beam coupler assembly (20) is configured to split light impinging thereon into a predetermined number of spatially separated light channels, and to cause phase locking and at least partial coherent combining of the light channels, having common longitudinal and transverse modes, in a double pass through the beam coupler assembly (20). The resonator cavity (10A) is configured and operable to produce at least one output combined light channel of a predetermined intensity profile.

A coupling device for connecting members, including: a coupling case that has a plurality of connecting slots which respectively receive the members; and wedges that are inserted into the spaces between the coupling case and each of the members perpendicularly to the direction of external pressure given to each of the members. Each of the wedges have one side and another side out of at least a couple of slope sides contacting the coupling case in opposite directions and have a higher coefficient of friction on a bottom side surface that touches one of the members than on the slope side surface that touches the coupling case.

An exposure apparatus includes a beam splitter for splitting light from a light source into first and second beams, a spatial light modulator, arranged in an optical path for the first beam, for modulating a phase distribution of the first beam, a beam coupler for coupling the first beam with the second beam, a projection optical system for projecting a pattern of the spatial light modulator onto a substrate using light from the beam coupler, and a controller for supplying a modulation signal to the spatial light modulator, wherein the spatial light modulator has a one-dimensionally or two-dimensionally arranged pixels, each pixel has plural reflective elements, and the reflective elements in the same pixel displace in the same direction simultaneously.

The invention discloses a reflection cavity mirror structure for a high-speed Q modulation and wavelength tunable type waveguide laser. The reflection cavity mirror structure for the high-speed Q modulation and wavelength tunable type waveguide laser comprises a split beam coupling structure, a big tunable optical micro-ring, a small tunable optical micro-ring and a Mach-Zehnder modulation structure, wherein the split beam coupling structure serves as an input end and a reflection output end, the two optical micro-rings are connected with the split beam coupling structure by being coupled with a first waveguide evanescent wave and a second waveguide evanescent wave respectively so that wavelength tuning can be achieved, and the two ends of the Mach-Zehnder modulation structure are connected with corresponding optical micro-ring evanescent waves respectively in a coupled mode through straight waveguide, so that wavelength tuning of the laser is achieved. According to the reflection cavity mirror structure for the high-speed Q modulation and wavelength tunable type waveguide laser, the reflectivity can be adjusted rapidly, wavelength tuning can be achieved, and the reflection cavity mirror structure can be used for constructing the high-speed Q modulation and wavelength tunable type waveguide laser. Due to the adoption of the two optical micro-rings, the range of the adjustable wavelength of the environment can be widened according to the vernier and calipers effect.

The invention discloses a beam coupling and focusing device for a laser diode array. The beam coupling and focusing device comprises the laser diode array, a fast axis collimation unit and a beam rotary array, which are sequentially placed along the forward direction of beams, wherein a toric reflecting mirror and an optical axis are placed at a certain included angle; and a target optical unit is positioned at a focal point of the toric reflecting mirror. The beam coupling and focusing device can couple and focus the beams which are emitted by the laser diode array. The beam coupling and focusing device has the advantages of simple structure, convenience for installation, low insertion loss, high coupling efficiency and high structure compactness.

The circular ring Dammer grating features phase board, which has several concentric annuluses formed on transparent medium and has the size similar to the aperture of diffraction limit lens, and the annulses, which have such the phase distribution that the phase in the same annulus is the same and the phases in adjacent annuluses are 0 and phi alternately. The present invention can correct the various orders of spectral light strength of far field diffraction spot of laser beam to obtain annular light strength distribution of specific orders. The present invention provides the phase board manufacturing parameters, which, after being optimized, can meet the requirement of far field diffraction spectrum peak strength difference in various orders within 10%.

The invention relates to a numerical control laser cloth cutting machine. A machine body is a power distribution box; an actuating mechanism consists of an X-axis screw rod assembly, a Y-axis screw rod assembly and a Z-axis screw rod assembly which are arranged on the machine body; a Z sliding block nut sleeve is a screw rod nut of the Z-axis screw rod assembly; a laser generator is fixed on the Z-axis screw rod assembly; two double-shaft brackets are fixedly arranged on two lateral surfaces of one end of the machine body by bolts; two single-shaft brackets are fixedly arranged on two lateral surfaces of the other end of the machine body by bolts. The numerical control laser cloth cutting machine is characterized in that a cloth beam and a driven cloth pressing roller are sequentially connected between the two double-shaft brackets from outside to inside by a shaft; a cloth beam motor is connected with a cloth beam coupling; the cloth beam motor is fixed on the double-shaft bracket; a driving cloth pressing roller is connected between the two single-shaft bracket by a shaft; a cloth pressing roller motor is connected with a driving cloth pressing roller coupling; the cloth pressing roller motor is fixed on the single-shaft bracket. Cloth is cut by laser; a cutting number can be labeled on the cut cloth, so that follow-up operation is facilitated for a sewer; miniaturization rapid production of customizing clothes is realized.

The invention relates to a generation device of quantum entanglement among three atomic ensembles, and mainly aims to solve the existing technical problem of probability preparation existed by quantum entanglement among a plurality of atomic ensembles. The invention adopts the technical scheme that the generation device of quantum entanglement among the three atomic ensembles comprises a light source unit, nine acousto-optic modulators, three sets of optical parametric amplifiers, a beam coupling system, the three atomic ensembles, three sets of optical filtering systems and an entanglement measurement system. Under the light writing action of quantum memory, orthogonal component quantum states of three entangled light pulses are mapped into collective spin waves of the three atomic ensembles, and quantum entanglement among the three atomic ensembles is certainly established; then, under the light reading action of quantum memory, the collective spin wave quantum states of the three atomic ensembles are mapped into the orthogonal component quantum states of the three release light pulses, and quantum entanglement among the three atomic ensemble is certainly verified through measuring correlative characteristics of the orthogonal component quantum states of the three release light pulses and the collective spin waves of the three atomic ensembles.

The invention discloses a lateral multi-end symmetry pumped alkali vapor laser MOPA (master oscillator power amplifier system). A tunable semiconductor laser power amplification system comprises a semiconductor laser, an amplifier, two isolators, two planar total reflective mirrors, two half wave plates, two half-transparent half-reflecting mirrors, a high-transparent low-reflecting mirror, a rubidium vapor saturation absorbing tank and an optical detector; a seed light system comprises a focusing lens, a polarization splitting lens, a temperature control box, a rubidium vapor tank, a concave full-reflecting mirror and a planar output coupling mirror; the master oscillator power amplifier MOPA system comprises a planar full-reflecting mirror, a laser diode array, a beam expanding mirror, a transparent quartz tube and a rubidium vapor tank. The one-way absorption efficiency of alkali metal vapor to pumping light is improved, and stable output of seed light can be ensured due to a stable plano-concave resonant cavity; vapor deposition can be avoided, and the service life of the vapor tank is prolonged; by adopting a lateral multi-end symmetry beam coupling mode, a high matching degree of pumping light and an expanded seed light mode can be ensured, and high-quality and high-efficiency amplification light can be obtained.

The embodiment of the invention provides a multiplexing combined polarization-preserving fiber ring implementation method and a polarization-preserving fiber ring. In the implementation method, the two pigtails of an original polarization-preserving fiber ring are respectively connected with the two beam coupling pigtails of two polarizing beam splitters / couplers (PBS) with polarization-preserving fiber pigtails, the two PBSes are connected by the one branch pigtail of each PBS, and the other branch pigtails of the PBSes are used as the two pigtails of the polarization-preserving fiber ring after combination, wherein both the two branch pigtails of each PBS are subject to slow-axis beam propagation and are respectively coupled with the slow axes or fast axes of the two beam coupling pigtails, so that an incident linearly polarized light wave sequentially and respectively circles round the fast axis and the slow axis of the original polarization-preserving fiber ring and then passes through the whole fiber ring. By implementing the technical scheme, the two eigen polarization axes of the polarization-preserving fiber can be fully used, thereby lengthening the effective optical path of the polarization-preserving fiber ring and effectively shortening the required fiber length under identical conditions.

The invention relates to a generating device for entanglement of continuous variable atom ensemble and belongs to the generating device for the entanglement of atom ensemble applied to a quantum information network. The generating device is used for solving the technical problem that probability preparation exists in the present preparation for the entanglement of atom ensemble of variables separation. According to the technical scheme provided by the invention, the generating device for entanglement of continuous variable atom ensemble comprises a light source unit, a plurality of beam coupling systems, two sets of atom ensembles, an entanglement measuring system and a feedback unit. The orthogonal component of a light field in the continuous variable quantum information and the collective spin wave of the atom ensemble are utilized to generate the entanglement of two sets of stokes light and spin wave of atom ensemble in a spontaneous raman scattering process, and then interference signals of the two beams of stokes light are fed back to a first atom ensemble through the quantum entanglement exchange, the entanglements of the first atom ensemble and the second atom ensemble are certainly prepared, and the generated stokes light is utilized to measure and analyze the entanglement of the atom ensemble.