439 results about "Stimulated emission" patented technology

A laser diode, grown on a miscut nonpolar or semipolar substrate, with lower threshold current density and longer stimulated emission wavelength, compared to conventional laser diode structures, wherein the laser diode's (1) n-type layers are grown in a nitrogen carrier gas, (2) quantum well layers and barrier layers are grown at a slower growth rate as compared to other device layers (enabling growth of the p-type layers at higher temperature), (3) high Al content electron blocking layer enables growth of layers above the active region at a higher temperature, and (4) asymmetric AlGaN SPSLS allowed growth of high Al containing p-AlGaN layers. Various other techniques were used to improve the conductivity of the p-type layers and minimize the contact resistance of the contact layer.

Disclosed is a flexible insert (100) for placement on the human eye, comprising a light source (110) in said insert such that light emitted from the light source is shielded from the human eye upon correct placement of the insert on the human eye, a light-responsive material (120) placed in the light path of the light source, said light-responsive material emitting light upon stimulation by the light from said light source, the intensity of said stimulated emission being sensitive to a chemical interaction of the light-sensitive material with an analyte of interest, a photodetector (130) for detecting the light emitted by the light-responsive material; and a transmitter (140) coupled to the photodetector for transmitting a photodetector reading. The insert may be used in conjunction with a reader for automated monitoring of an analyte of interest such as glucose in the tear fluid of its wearer.

A light source device for radiating a stimulated emission from a semiconductor laser to outside via a multiple scattering optical system, which system has a first region located adjacent to the semiconductor laser and a second region that abuts on the first region and reaches the outside. The first region contains scatterers at a higher density than the second region does. The light source device has an amount of near-field pattern speckles σ_PAR of 3×10⁻³ or more. The second region may have a lens portion as a magnifier for at least a principle part of a secondary planar light source formed at an interface between the first and second regions.

Optical fiber lasers and components for optical fiber laser. An optical fiber laser can comprise a fiber laser cavity having a wavelength of operation at which the cavity provides output light, the cavity including optical fiber that guides light having the wavelength of operation, the fiber having first and second lengths, the first length having a core having a V-number at the wavelength of operation and a numerical aperture, the second length having a core that is multimode at the wavelength of operation and that has a V-number that is greater than the V-number of the core of the first length optical fiber at the wavelength of operation and a numerical aperture that is less than the numerical aperture of the core of the first length of optical fiber. At least one of the lengths comprises an active material that can provide light having the wavelength of operation via stimulated emission responsive to the optical fiber receiving pump light. Components include a mode field adapter and optical fiber interconnection apparatus, which can be used to couple the first and second lengths of optical fiber, or can couple the fiber laser to an optical fiber power amplifier, which can be a multimode or single mode amplifier.

An embodiment of a collimating downlight has front-mounted blue LED chips facing upwards, having a heat sink on the back of the LED chips exposed in ambient air. The LED chips are mounted in a collimator that sends their blue light to a remote phosphor situated near the top of the downlight can. Surrounding the remote phosphor is a downward-facing reflector that forms a beam from its stimulated emission and reflected blue light. The phosphor thickness and composition can be adjusted to give a desired color temperature.

Highly uniform 1 nm silicon nanoparticles are provided by the invention. The nanoparticles exhibit beneficial properties. They are a source of stimulated emissions. They may be suspended in liquids, and solids. They can be formed into crystals, colloids and films. The nanoparticles of the invention are about 1 nm having about only one part in one thousand greater than 1 nm. A method for producing the silicon nanoparticle of the invention is a gradual advancing electrochemical etch of bulk silicon. Separation of nanoparticles from the surface of the silicon may also be conducted. Once separated, various methods may be employed to form plural nanoparticles into colloids, crystals, films and other desirable forms. The particles may also be coated or doped.

The invention provides an aerosol particle laser analyzer which online and continuously detects the aerodynamic diameter and particle quantity of the aerosol particles in the air one by one in real-time and identifies whether the particles are biological particles; the aerosol particle laser analyzer comprises a particle beam queuing acceleration sampling system wrapped by shell flows, a dual-peak laser aerodynamic diameter measurement system, a biological particle fluorescent detection system induced by ultraviolet laser, an ineffective and superposed particle identification circuit, data processing, displaying and memorizing software, and a communication module. The aerosol particle laser analyzer can not only detect the physical parameters such as aerodynamic diameter, particle quantity and the like of the aerosol particles, but also can judge whether the particles are active biological particles or not according to the natural characteristic that the active biological particle emits bioluminescence when being induced and can measure the parameters of the active biological particles such as the quantity, the concentration and the like; the aerosol particle laser analyzer has exact detection results and can be used conveniently and fast for detection; and the parts have long service life and the volume of the aerosol particle laser analyzer is small, thus being convenient for movable usage.

The invention provides a whispering gallery mode photonic device and a preparation method thereof. According to the preparation method of a micro ring array structure, solvent droplets are utilized to dissolve a polymer film, so that a "coffee ring effect" can be generated, and therefore, polymer can be accumulated at the periphery of liquid so as to form an annular structure of which the height is obviously different from the height of the film, and conduction and confinement of light in the polymer structure can be realized; and light signals are inputted to the micron ring structure through utilizing excitation, scattering or near field coupling modes, so that a resonance effect in a whispering gallery mode can be realized. The prepared micron ring structure can be adopted as a high-quality factor optical micro cavity, so that a modulation-mode spectrum can be obtained, the width of spectral lines of the spectrum being significantly narrowed; a whispering gallery-mode light amplification stimulated emission can be realized through optical gain; and in a multi-ring coupled array structure, light signal processing and high sensitive response to outside stimuli can be realized according to the wavelength change information of the modulated spectrum and laser modes.

Aberrations in stimulated emission depletion microscopy are corrected using an adaptive optics approach using a metric which combines both image sharpness and brightness. Light modulators (22,32) are used to perform aberration correction in one or more of the depletion path (10), the excitation path (12), or the emission path from sample to detector.

The invention discloses a method for two-photon fluorescence stimulated emission differential super-resolution microscopy. The method includes the steps that (1) after being collimated, pulsed laser beams are converted into linear polarized light and polarization modulation is conducted on the linear polarized light, so that radial polarized light is obtained; (2) the radial polarized light is converted into circular polarized light and projected onto a sample to be tested, two-photon stimulated emission is conducted, fluorescence is collected, and therefore first signal light intensity I1 is obtained; (3) polarization modulation is conducted on the linear polarized light obtained in the step (1) and the linear polarized light is converted into tangential polarized light; (4) the tangential polarized light is converted into circular polarized light and projected onto the sample to be tested, two-photon stimulated emission is conducted, fluorescence is collected, and therefore second signal light intensity I2 is obtained; (5) effective signal light intensity I is calculated according to a formula I=I1-gammaI2 , so that super-resolution imaging is achieved. The invention further discloses a device for two-photon fluorescence stimulated emission differential super-resolution microscopy. The device is simple, free of light division, low in light power, capable of weakening the photobleaching effect, higher in resolution and larger in imaging depth.

The invention discloses a multi-antenna correction method, a multi-antenna transmitter and a base station system, wherein the device includes at least one antenna, at least a duplex module, at least a stimulated emission channel and a digital emission channel, at least a stimulated receiving channel and a digital receiving channel, a DPD feedback channel, and a multi-antenna correction channel, wherein, the DPD feedback channel is used for receiving the operation signals output by the stimulated emission channel, and transmitting to the PD coefficient computing module to compute the obtained PD coefficient, and outputting to the digital emission channel to perform DPD correction; the multi-antenna correction channel computes the Tx correction coefficient according to the Tx correction signal and transmits to the digital emission channel to transmit the correction, or obtains the Rx correction coefficient according to the Rx correction signal, transmits to the digital receiving channel for receiving correction. According to the invention, the multi-antenna correction and DPD correction are combined, thereby advancing system performance.

The invention discloses a scanning microscope for optical measurement with high spatial resolution of a specimen point of a specimen, having a light source for emitting an exciting light beam suitable for exciting an energy state of the specimen; a detector for detection of the emitted light; and a stimulating light beam, coming from the light source, for generating stimulated emission of the specimen excited by the exciting light beam at the specimen point, the exciting light beam and the stimulating light beam being arranged in such a way that their intensity distributions in the focal region partially overlap, wherein optical elements which shape the stimulating light beam are combined into at least one module that is positionable in the beam path of the scanning microscope.

The invention discloses a display panel and a display device. The display panel comprises a first display module and a second display module which is located at the light emission side of the first display module; the second display module is a liquid crystal display module, and the first display module is used for modulating light rays entering the second display module; the first display modulecomprises multiple first pixel units which are distributed in an array; the second display module comprises multiple second pixel units which are distributed in an array; the display panel further comprises quantum dot layers between the first pixel units and the second pixel units. By adopting a mode that emergent light of the first pixel units excites quantum dots, mixed-color light is generated, and backlight is provided for the second display module. Quantum dot materials in the quantum dot layers are emitted to the periphery at all angles through the light rays emitted by stimulation, theoriginal propagation direction of the ray lights is changed, the generated light rays can better damage a pattern generated by a periodicity grating structure, and accordingly the moire fringe is removed.

The present invention provides a semiconductor light emitting device realizing lower detection level of spontaneous emission light by a semiconductor photodetector and improvement in light detection precision by selectively reflecting spontaneous emission light. The semiconductor light emitting device includes a semiconductor light emitting element for generating light including stimulated emission light having a wavelength λo and spontaneous emission light having a wavelength band including the wavelength λo, a multilayer filter having a stack structure in which a low-refractive-index layer having a thickness of λ₁/(4×n_a) (λ₁<λo and n_a denotes refractive index) and a high-refractive-index layer having a thickness of λ₁/(4×n_b) (n_b>n_a and n_b denotes refractive index) are alternately stacked, and a semiconductor photodetector having a light absorption layer that absorbs a part of light passed through the multilayer filter.

A method for reading a radiation image from a stimulable phosphor sheet composed of a substrate and a stimulable phosphor layer containing a latent radiation image by as of a radiation image-reading means having a stimulating light-applying unit and a stimulated emission-collecting unit having a lens and a stimulated emission-receiving plane, which is performed by the steps of applying a stimulating light onto the phosphor layer under the condition that the phosphor sheet moves along its sheet plane in relation to the stimulated emission-collecting unit; collecting a stimulated emission emitting from the area onto which the stimulating light is applied on the emission-receiving plane through the lens; and photoelectrically converting the collected emission into electric signals in the stimulated emission-collecting unit, is improved by moving the stimulable phosphor sheet in relation to the emission-collecting unit under the condition that the stimulating light-applied area of the stimulable phosphor layer is kept apart from the center of the emission-receiving plane with a space in the range defined by a combination of a reference space and a focal depth of the lens, in which the reference space is defined by a length at which the stimulated emission emitting from the phosphor layer focuses on the emission-receiving plane after passing through the lens.

Systems and methods for hyper-resolution beyond the diffraction limit of optical microscopes for applications in spectroscopy, absorption and lithographic photochemical patterning are described. These systems are based on interference of a pump pulse and a Stokes laser pulse which interfere to localize the population of an excited vibrational state in an area that is smaller than the scanning resolution of the microscope. Another (interfering) Stokes pulse has an annular shape at focus and destructively interferes with the the Stokes laser pulse. This destructive interference causes narrowing of the population distribution of the vibrational excited state well below the diffraction limit, which in turn localizes the population of the central electronic excited state by a separate actinic laser pulse having a lower energy than the ground state excitation energy of the molecule.

A stepped photolithography system uses two photomasks to produce photoresist images capable of printing features smaller than 10 nm.