364 results about "Beam collimation" patented technology

A system and method are provided for obtaining data that may be used to generate images of a brain or other bodily organ. The system can include a pair of detecting arrangements and a collimating arrangement associated with each detecting arrangement. A first collimating arrangement can include a cone-beam collimating arrangement having a focal point located within the brain or other organ being imaged. A second collimating arrangement can include a fan-beam collimating arrangement having a focal length selected such that the organ being imaged lies within its field of view to ensure data sufficiency. Cone-beam collimating arrangements having improved hole geometries can also be utilized to provide further increases in imaging sensitivity.

A laser beam delivery system is disclosed, which allows transmission of high-power infrared light through a hollow core photonic band gap (HC-PBG) fiber made of non-silica-based glass. In this system, the infrared beam first passes through input coupling optics which focus the beam onto the hollow core of the HC-PBG fiber. In front of the input end of the HC-PBG fiber, there is provided a mask with a hole aligned with the hollow core, and the infrared beam first passes through this hole before entering the hollow core of the HC-PBG fiber. This protects the photonic band gap structure from being damaged by the beam. After passing through the HC-PBG fiber, which may be from one to several hundred meters in length, the infrared beam exits at the output end of the fiber and passes through output coupling optics which collimate and focus the beam onto a desired target. The various components of the system may be water cooled during the operation or subjected to a gas purge to prevent condensation or gas ionization.

X-ray pixel beam array systems and methods for electronically shaping radiation fields and modulating radiation field intensity patterns for radiotherapy are disclosed. One exemplary pre-clinical system may include addressable electron field emitters (102, 104) that are operable to emit a plurality of electron pixel beams (106, 108, 110). Each electron pixel beam may correspond to an x-ray target (124) and x-ray pixel beam collimation aperture (136, 138) to convert a portion of energy associated with the electron pixel beam to a corresponding x-ray pixel beam (140, 142). Further, the x-ray pixel beam array collimator (130) forms a one-to-one correspondence between individual electron pixel beam and its corresponding x-ray pixel beam. One exemplary clinical system may include a high-energy electron source (1203), an n-stage scanning system (1210), x-ray pixel beam targets (1212), and an x-ray pixel beam array collimator (1214). A controller (1206) may sequentially direct electron beam pulses to predetermined x-ray pixel targets and produce an electronically controlled radiation field direction, pattern; and intensity pattern.

The invention relates to a fiber coupling module of a high-power semiconductor laser, which comprises a plurality of single-tube semiconductor lasers with the same wavelength in the same polarization state, beam collimation lenses, a glass flat plate, reflecting prisms and a focusing device, wherein expect one path of the single-tube semiconductor lasers, the other single-tube semiconductor lasers are all parallel to an axis x and arrayed in a ladder shape; the beam collimation lenses are arranged in front of each single-tube semiconductor laser, and the light emitted by each single-tube laser passes through a beam collimation lens and then passes through a reflecting prism; each reflecting prism keeps consistent with a single-tube laser corresponding to the reflecting prism on the horizontal height; the light emitted by the plurality of single-tube lasers is transmitted to the focusing device through reflecting; and beams emitted by the single-tube lasers arranged in the direction of an axis z is directly transmitted to the focusing device through gaps among the plurality of the reflecting prisms and then combined with other beams to focus together and then enter a fiber. In the invention, the distances of the welding positions of each single-tube laser become longer, and the high-power semiconductor laser fiber coupling module has easy welding, convenient debugging, good heat radiating effect and high coupling efficiency.

The invention discloses a light path collimation integrated device and method for a high-power laser device. A transmission grating engraved with references is put near to the small-hole face of a space filter; the transmission grating is irradiated by parallel non-coherent illumination lights produced by a light emitting diode and an illumination collimation lens at a specific angle; a sampling light path is put in a direction of first-stage diffraction light of the transmission grating so as to form a light beam information monitor; the light beam information monitor simultaneously acquiresinformation of a near field and a far field of a light beam; the output of the light beam information monitor is connected to a computer; deviation values of the near field and far field of the lightbeam relative to the respective set positions are determined through an image processing technology; and a corresponding near field adjusting device and a corresponding far field adjusting device areselected according to the respective deviation values so as to adjust light path collimation. The light path collimation integrated device has the characteristics of integration, modularization, simple structure and high precision, and can meet a monitoring requirement of the high-power laser device on large-aperture light beam collimation.

The invention belongs to the field of medical equipment, is used for the intensity modulated radiation therapy of tumors and particularly relates to a double-layer multi-blade collimator. The double-layer multi-blade collimator comprises a switching multi-blade collimator on the upper layer and an electric multi-blade collimator on the lower layer; both the switching multi-blade collimator and the electric multi-blade collimator consist of two groups of opposite blades; the front end face of each blade of the switching multi-blade collimator is a straight end face and the rear end of the blade of the switching multi-blade collimator is connected with a micro electromagnetic driving mechanism; each blade of the electric multi-blade collimator is driven by a micro motor; and the blades of the switching multi-blade collimator and the blades of the electric multi-blade collimator move, are laid out in the same direction and have the same numbers. The double-layer multi-blade collimator is applied to a tumor intensity modulated radiation therapy device and has the advantages of simple structure, beam collimation, high working efficiency, high frequency modulation resolution and high safety.

A laser apparatus is disclosed utilizing a laser diode having a reflective back facet and a front facet having a reflectance of less than about 1% for emitting an optical beam at a fundamental frequency along an optical path. A collimating lens is provided for collimating the optical beam into a collimated beam. A transmission grating is optically coupled to receive the collimated beam and returns a portion of the collimated beam back into the laser diode by means of diffraction through lens and the laser diode front facet. The laser diode reflective back facet and the transmission grating form an extended laser cavity. In operation, a substantial portion of the collimated beam is transmitted through the transmission grating for producing the laser output beam propagating along the optical path.

A radiation therapy treatment method includes providing a patient model, dosimetric constraints, delivery motion constraints, and delivery coordinate space of a radiation delivery device, where the delivery coordinate space is represented as a mesh with vertices connected by edges, where the vertices correspond to directions of a beam eye view (BEV) of the radiation delivery device, where each BEV has corresponding area elements resulting from beam collimation. BEV region connectivity manifolds are constructed from the patient model, the dosimetric constraints, the delivery coordinate space, and existing beam trajectories, wherein each of the BEV region connectivity manifolds represents connections between contiguous 2D target regions, where each of the 2D target regions is defined at each of the vertices of the delivery coordinate space. Beam trajectories are selected based on region connectedness information in the BEV region connectivity manifolds, the dosimetric constraints, the delivery motion constraints, and the existing beam trajectories. Radiation is delivered using the radiation delivery device in accordance with the beam trajectories.

The invention discloses a collimating and beam expanding device for semiconductor laser sources of a laser radar. The collimating and beam expanding device is mainly composed of an aspherical lens, a quartz positive lens, a tunable flange and the like. The collimating and beam expanding device is simple in structure, low in cost and good in beam collimation performance, a divergence angle of a semiconductor laser is compressed from 0.2X0.4rad to below 0.2mrad, and the requirement of the laser radar for probing light sources is met; the device is stable in optical and mechanical properties, can be used under level-18 random vibration at the environment temperature from minus 30 DEG C to minus 50 DEG C, and meets the requirement of the laser radar on stability in bad conditions; the device is provided with the flange, semiconductor laser sources different in divergence angle can be obtained by fine tuning of the flange of the beam expanding device; by tuning of the flange, the device can also be applied to beam collimation of other different-wavelength light sources.

A reflector system having two-axis control through which beam collimation and wide-angle beam overlapping occur, and a method of manufacturing such a system through cutting flat reflective sheeting and forming the resultant flat parts into the three-dimensional reflectors that collect and shape the light from solid state LEDs, wherein each axis may be customized by changing the cutting and bending of the flat pieces.

The present invention provides an atom magnetometer without a response blind area. The atom magnetometer comprises a laser, an expanded beam collimation device, a circularly polarized light conversiondevice, an acoustic optical modulator, an Helmholtz coil, an atom air chamber, a reflector set, a photoelectric detector, a lock-in amplifier, a signal processing system and a heating device. The atom magnetometer is simple in structure; and two exciting methods which apply an excitation magnetic field and perform light modulation are combined, and components of the total spin angular momentum ofa sensing atom in two directions are detected to achieve measurement of a blind area without response. The present invention further discloses a method for measuring an external magnetic field by employing an atom magnetometer without response blind area and method. The measurement method is simple, has no response blind area, can rapidly and accurately obtain related data of an external magneticfield, and is high in practicability.

An on-line EDXRD analyser including (i) a housing defining an analysis zone and having a passageway through it to allow transport of material in a process stream to pass through the analysis zone, (ii) a collimated source of polychromatic X-rays, (iii) an energy-resolving (ER)X-ray detector, (iv) a primary beam collimator disposed between the source of X-rays and the (ER)X-ray detector comprising an annular slit which defines an incident beam of polychromatic X-rays to irradiate a portion of the analysis zone, (v) a scatter collimator disposed between the primary beam collimator and the ERX-ray detector, the scatter collimator comprising an annular slit which defines a diffracted beam of X-rays scattered by the material to converge towards the ERX-ray detector, and (vi) a detector collimator comprising a conical opening which further defines the diffracted beam of X-rays scattered by the material. The ERX-ray detector measures an energy spectrum of the diffracted X-rays at a predetermined diffraction angle defined by the relative positioning of (ii) to (vi), and where one of (iv) and (v) comprises an aperture arranged to enable a detector to measure the transmission of a direct beam of X-rays through the material.

The invention provides an optical emitter and an optical module. The optical emitter comprises a laser array, a collimating lens and adjustment lenses; the collimating lens is arranged on the emissionoptical path of one laser, the adjustment lenses are arranged on the emission optical paths of other lasers, and the collimating lens and the adjustment lenses are distributed in a non-linear mode inthe array direction; an optical multiplex component which synthetizes multiple paths of light beams into a path of light beam is arranged on the emergence optical paths of the collimating lens and the adjustment lenses, a focusing lens is arranged on the emergence optical path of the optical multiplex component, and an optical port is formed in the emergence optical path of the focusing lens; thecollimating lens is used for collimating light beams emitted by the lasers and making the collimated light beams irradiate into the optical port through the optical multiplex component and the focusing lens; the adjustment lenses are used for making the light beams emitted by the lasers irradiate into the optical multiplex component in the mode parallel to the collimated light beams. The opticalemitter and the optical module are high in yield and short in coupling time.

The invention discloses a terahertz time-domain spectroscopy complete polarization electromagnetic scattering measurement system and acquisition method. According to the method, HH transceiving polarization, HV transceiving polarization, VH transceiving polarization and VV transceiving polarization are achieved by the aid of a terahertz time-domain spectroscopy complete polarization target electromagnetic scattering measurement system. The system mainly comprises a femtosecond laser source, a terahertz transmitting source, a terahertz wave beam collimation system, a target turntable system, aterahertz wave polarization control system, a terahertz wave detection system and a data acquisition and control system, a transceiving polarization mode is determined by adjusting rotating directionsof a hertz polarizer and a femtosecond laser half-wave plate, so that a turntable and a time delay line are controlled, and target polarization terahertz time-domain spectroscopy scattering signals under different postures are acquired in a scanned manner. According to the system, scattering characteristic measurement of target complete polarization RCS and 3D (three-dimensional) ISAR and the like within a terahertz high-frequency point and large-spectrum width range can be achieved, and the mechanical stability of the system is further ensured.

The invention discloses an infrared night-vision laser searchlighting device, which takes an infrared laser diode (LD) as an active infrared night-vision searchlighting device light source and mainly comprises an optical system which takes the LD as the light source and an LD conduction heat abstractor. The optical system comprises a light beam compressing and light beam reshaping unit combined by an optical fiber and a non-spherical lens assembly for correcting the non-axisymmetry of output beams; a light beam expanding unit consisting of a negative lens assembly to prevent a phenomenon of ionization and an ablation phenomenon generating dispersion dust particles caused by laser beam focusing in a transmission process; and a collimation unit consisting of a coated lens assembly for leading the laser beam to form a collimating searchlighting beam. The invention has the advantages of high searchlighting power, good beam collimation property, small volume, light weight and good practicability and is capable of observing a distant target object 2-3km far away at night.

The invention discloses a two-dimensional exit pupil expansion waveguide near-to-eye optical display device. The device comprises a miniature display screen, an ocular lens group, a vertical expansionwaveguide device and a horizontal expansion waveguide device. The miniature display screen and the vertical expansion waveguide device are respectively disposed on the focal plane and the emergent light path of the ocular lens group, and the ocular lens group is used for collimating beams emitted by the miniature display screen into parallel beams. The horizontal waveguide device is disposed on the emergent light path of the vertical waveguide device, and a horizontally coupled incident surface is parallel to the upper and lower surfaces of the vertical waveguide device. The vertical expansion waveguide device is used for increasing the vertical equivalent size of the parallel beams emitted by the ocular lens group, and the horizontal waveguide device is used for increasing the horizontalequivalent size of a vertically expanded beam to obtain a two-dimensional expanded beam and emitting the two-dimensional expanded beam to the pupils of the human eyes. The device can reduce the sizewhile expanding the angle of view, and irons out the defects of vertical axis aberration, curvature of field and distortion.