34 results about "Wavelength shifter" patented technology

A lidar system capable of remotely identifying calibrated absolute aerosol backscatter coefficients of atmospheric aerosol particles by transmitting a beam of light and spectrally separating the intensity of Rayleigh and Mie backscattering is disclosed. The transmitter features high pulse energy to generate sufficient Rayleigh backscattering, enabling atmospheric scanning in a timely manner. The transmitter employs a seeded Nd:YAG laser and a seeded stimulated Raman scattering wavelength shifter to achieve narrow bandwidth, eye-safe laser pulses. The receiver employs a telescope, collimating lens, beam splitter, molecular absorption filter, focusing lenses, and avalanche photodiodes. Mie backscattering is blocked by the molecular absorption filter to provide a Rayleigh signal, which is used with knowledge of atmospheric density to calibrate the Mie signal. The system is intended for atmospheric research and aerosol monitoring applications where calibrated Mie scattering intensity is necessary to measure the optical depths of aerosol structures such as plumes, clouds, and layers.

A polarization lidar system capable of remotely identifying characteristics of atmospheric aerosol particles by transmitting a polarized beam of light and analyzing polarization characteristics of received backscatter is disclosed. The transmitter features high pulse energy to remotely identify aerosol particles with substantially one pulse. The transmitter employs a thin film plate polarizer and a Raman wavelength shifter to achieve eye-safe, single-plane linearly polarized energy. The transmit beam and receiver field of view are coaxial. The receiver employs a telescope, a collimating lens, and a beam splitter. The beam splitter splits the received backscatter into a single-plane polarized beam whose polarization plane is parallel to the plane of transmission and a single-plane polarized beam whose polarization plane is perpendicular to the plane of transmission. Each split beam is directed through separate focusing lenses onto separate detectors. The detector signals are amplified and processed to remotely determine atmospheric aerosol particle characteristics.

A phoswich device for determining depth of interaction (DOI) includes a wavelength shifting layer between first and second scintillators of different scintillation materials and having different decay time characteristics. The wavelength shifting layer allows a true phoswich device to be constructed where the emission wavelength of one scintillator is in the peak excitation band of the other scintillator, by shifting the scintillation light outside of this excitation band to prevent scintillation light of one scintillator from exciting a response in the other scintillator, thus enabling unique identification of the location of a gamma photon scintillation event. The phoswich device is particularly applicable to positron emission tomography (PET) applications.

This invention is a tunable dispersion compensation apparatus that suppresses the effects of the transmission channel dispersion which impedes transmission when optical signals used in high-speed communications are transmitted across long distances among various points. It is an apparatus that performs dispersion compensation upon received optical signals based on information that accompanies the received optical signals, or an apparatus that performs dispersion compensation in advance upon optical signals to be sent based on information related to the destination of the optical signals to be sent, including: an input block and output block for optical signals, with a dispersion element that has wavelength dispersion characteristics and a wavelength shifter that is able to adjust the amount of shift depending on the input optical signal provided in a circulating light path upon the light path from the input block to the output block, and further including a constitution whereby the input optical signal circulates around a circulating light path containing the dispersion element and wavelength shifter a stipulated number of times before reaching the output block, and a constitution whereby the number of times the light circulates is determined based on the information and input to the wavelength shifter.

The optical exchaning matrix of sheared wavelength converter the comprises wavelength demultiplexer, space optical switching unit, the tunable wavelength shifter, the optical switch and the optical splitter/mixer. Each input port shares one wavelength shifter. The full wavelength shifter and the optical switch based on the lithium niobate wave-guide can be tuned by the four wave mixing based on the semiconductor light amplifeir. The space optical switching unit, which is composed of the optical splitter, the optical switch and the mixer, is adopted in the invention. Based on the control information sent from the control unit in the kernel node, the optical switches in the space optical switching unit as well as the optical switches between the wavelength shifter and the output port are controlled.

A laser beam having a single wavelength emitted from a laser light source is converted at a wavelength shifter into a laser beam having at least two wavelengths, which is further demultiplexed at a beam splitter into a laser beam having a first wavelength and a laser beam having a second wavelength. The output power and pulse width of the laser beam having the first wavelength are adjusted by a first controller so as to reach levels appropriate for generating ultrasonic vibrations without causing damage to an inspection object. The output power and pulse width of the laser beam having the second wavelength are adjusted by a second controller so as to reach appropriate levels for detecting the above-described ultrasonic vibrations. These laser beams are multiplexed by a multiplexer into a single laser beam to be focused onto a surface of the inspection object.

A controlled, switched laser system for vaporizing a target structure on a substrate includes a diode-pumped, solid-state laser for producing a laser output, a controllable switch for controlling the on/off state and power level of the laser, and a wavelength shifter. The wavelength shifter shifts the wavelength of the laser output from a conventional wavelength to a wavelength beyond the absorption edge of the substrate but shorter than 1.2 μm in order to obtain a decrease in absorption of the laser output by the substrate due to the shift in the wavelength of the laser output. The wavelength shifter is removably insertable into the switched laser system so as to enable the switched laser system to operate at the conventional wavelength and at the wavelength beyond the absorption edge of the substrate. Heating of the substrate and hence damage to the substrate is limited due to the wavelength being beyond the absorption edge of the substrate. Good depth of focus of the laser beam output is maintained relative to spot size of the laser beam output due to the wavelength being less than about 1.2 μm.

A medical laser apparatus comprises: a solid laser oscillating source which emits a beam of a wavelength λ1 in an infrared region of approx. 1040 nm to approx. 1080 nm; a first fiber-based Raman shifter including a first Raman fiber which generates, when receives the λ1-beam from the laser oscillating source, a first-order Stokes beam of a wavelength λ2 different from the wavelength λ1 by stimulated Raman scattering, the first Raman fiber being formed with a pair of fiber Bragg gratings which forms a resonator for the λ2-beam; a first nonlinear crystal which wavelength-converts the λ2-beam outputted from the first Raman wavelength shifter to a second harmonic beam of a wavelength λ2′ in an orange region of approx. 580 nm to approx. 600 nm; and a light guiding optical system which guides the λ2′-beam to a treatment part.

The present invention provides scintillation material having good stability at continuous operating temperatures of at least 175° C. The scintillation material includes a cross linked copolymer with improved aromatic character that form a host plastic having properties of a thermoset polymer. The host plastic contains a primary fluorescent agent and a wavelength shifter. Preferably, the copolymer is comprised of a styrene derivative such as, for example, p-t-butylstyrene, and a higher melting point compound such as, for example, 4-vinylbiphenyl. In accordance with one aspect of the present invention, the scintillation material possesses properties of: good mechanical properties at high temperature (e.g., a Tg of about 180° C.); excellent light output (e.g., energy transfer efficiency); high hydrogen content for fast neutron detection; good optical transparency; and stable operation at temperature.

The invention relates to an optical transmitting network node construction based on adjustable wavelength convertors and wavelength routers. The foot terminals of the wavelength routers linked with adjacent nodes are connected with the local foot modules and adjustable wavelength convertors. The local top modules and adjustable wavelength convertors are connected with the top terminals of the wavelength routers. The output terminals of local foot modules and input terminals of local top modules are connected with the local electrical network. The input terminals of router control modules are connected with the local electrical network, and the output terminals of router control modules are connected with the local top router module and the adjustable wavelength convertors respectively. The elimination of optical switch matrix at nodes reduces the exchanging time of nodes, the exchanging efficiency and the transmitting function are improved therefore.

A fiber coupling device comprises fixing parts 1V, to which the respective ends of two optical fibers 5 and 6 are fixed, photonic crystal 2, disposed inside the light path of light that propagates across the abovementioned ends, and external force application means 3, which applies an external force to photonic crystal 2. When an external force is applied by external force application means 3 to photonic crystal 2 while light is being propagated inside one optical fiber 5, the photonic band gap of photonic crystal 2 changes and light of a wavelength that is in accordance with this photonic band gap is output from the other optical fiber 5.

A wiring substrate, a display device including a wiring substrate, and a method of manufacturing a wiring substrate are provided. The display device comprises: a wiring substrate; a color conversion substrate on the wiring substrate and comprises a color conversion pattern having a wavelength shifter; and a backlight unit which is spaced apart from the color conversion substrate with the wiring substrate interposed between the backlight unit and the color conversion substrate. The wiring substrate comprises: a first base; a thin film transistor on the first base and comprising a gate electrode, an active pattern on the gate electrode, and a drain electrode and a source electrode on the active pattern and spaced apart from each other; and a wavelength-selective reflector which is disposed on the first base and stacked each other with the thin film transistor.

Described herein is a boron-loaded liquid scintillator composition comprising a scintillation solvent including at least one linear alkylbenzene (LAB), diisopropyl naphthalene (DIN) or phenylxylyl ethane (PXE), or a combination of one or more thereof; at least one boron-containing material; one or more fluors, such as 2,5-diphenyloxazole (PPO), and optionally one or more wavelength shifters, such as 1,4-bis[2-methylstyryl]benzene (bis-MSB). The boron-containing material may comprise a carborane, such as o-carborane, especially those enriched in Boron-10. Methods of preparation of the liquid scintillator composition are also described, as well as concentrates thereof.

An early warning system for detecting the UV from a missile plume has a wide field of view, large spectral bandwidth, solar blind detector. A coated detector passes only a spectral region that embraces UV signals of interest and a wavelength shifter includes a material that shifts the impinging UV energy into a spectrum that embraces the frequencies emitted by fluorescent photons. A photomultiplier tube responsive to the fluorescent emissions provides a responsive read-out indicative of an incoming missile.

A LED package structure includes a base; at least one main light chip assembled to the base; a plurality of sub light chips assembled to the base; a wavelength shifter assembled to the base, the wavelength shifter located above each main light chip and each sub light chip, the wavelength shifter configured to shift a wavelength of each light beam from each main light chip; an outer lens assembled to the base and located above the wavelength shifter, so as to package each main light chip, each sub light chip and the wavelength shifter, the outer lens improving a light extraction efficiency of the light beams; and a controlling member electrically connected to each main light chip and each sub light chip, the controlling member configured to control luminance of each main light chip and luminance of each sub light chip.

A device for improving vision of a person, having a camera and a display. The camera has an image sensor operative to capture an image of a predetermined area in front of the person, and an image processor operative to compress the image. The display is operative to reproduce the compressed image. Preferably, the image sensor is effective to detect infrared light, and an infrared illuminator is incorporated to radiate an infrared light upon the predetermined area. Therefore, even in the dim-lit condition, the predetermined area can be properly imaged. However, as the infrared image is barely visible to human eyes, a wavelength shifter is used to translate the compressed image with infrared wavelength to visible wavelength before the compressed image is displayed by the display.

The apparatus comprises a wavelength shifter for shifting the 1551nm or 1310nm or 850nm silicon optical fiber signals into 650nm plastic optical fiber signals, an optical switch and an optical network card. The wavelength shifter, optical switch and optical network card are sequentially connected through a 100Mbps plastic optical transceiver module working at 650nm wavelength.