Abstract:
Spectral device includes: diffraction element which disperses light for each wavelength; optical condensing system which condenses diffracted light of specific order generated by diffraction in the diffraction element; photo-detector arranged at position where the diffracted light of the specific order is condensed by the optical condensing system; first deflection device which inverts the direction of travel of second light as zeroth-order diffracted light generated by diffraction of first light which has entered the diffraction element as parallel luminous flux, and leads the second light into the diffraction element; and second deflection device which deflects the diffracted light of the specific order generated by diffraction of the second light which has entered the diffraction element in the same direction as the diffracted light of the specific order generated by the diffraction of the first light, and leads the deflected light into the optical condensing system.
Abstract:
The present disclosure pertains to metal or dielectric nanostructures of the subwavelength scale within the grating lines of optical diffraction gratings. The nanostructures have surface plasmon resonances or non-plasmon optical resonances. A linear photodetector array is used to capture the resonance spectra from one of the diffraction orders. The combined nanostructure super-grating and photodetector array eliminates the use of external optical spectrometers for measuring surface plasmon or optical resonance frequency shift caused by the presence of chemical and biological agents. The nanostructure super-gratings can be used for building integrated surface enhanced Raman scattering (SERS) spectrometers. The nanostructures within the diffraction grating lines enhance Raman scattering signal light while the diffraction grating pattern of the nanostructures diffracts Raman scattering light to different directions of propagation according to their wavelengths. Therefore, the nanostructure super-gratings allows for the use of a photodetector array to capture the surface enhanced Raman scattering spectra.
Abstract:
An apparatus for optical spectrometry utilizes a simplified construction, reducing the number of independent optical elements needed while providing a sizeable dispersed spectrum. The apparatus provides a spectral intensity distribution of an input source wherein individual spectral components in the source can be measured and, in some embodiments, can be manipulated or filtered.
Abstract:
A detection system comprising detection processing means, spectral discrimination means, and temporal tracking and declaration processing means which cooperate to detect and declare a missile launch. A spatial filter isolates discrete spectral features in an image from a detector array. The discrete spectral features must pass a threshold, which may be adaptive. In a spectral discrimination step, the pixel-to-pixel separation for those pixels passing the spatial filter step is compared to a predetermined pixel spacing. The predetermined pixel spacing is determined from the optical setup and a spectral feature of interest that is contained within the emission from, for example, an ignited rocket motor or other fired projectile. In a temporal step, the pixels that have met the other criteria are tracked as candidate detections, which are declared a threat if they display characteristics of a moving threat, e.g., a MANPADS missile, RPG, mortar or the like.
Abstract:
A spectra shaping apparatus for chirped pulse amplification (CPA): uses a spectrum decomposing system with CTSI construction, a spectrum synthesizing system with CTSI structure that is optically symmetrical to the decomposing structure, and a spectrum shaping system including an aperture and a planar reflector for spectrum shaping function design. The apparatus accomplishes the following functions: firstly decomposing the spectrum of a chirped temporal pulse laser to a spectral domain; then shaping the spectrum in the spectral domain; finally synthesizing un-shiftily this shaped spectrum in the spectral domain into a temporal chirped pulse with a designed shape. The apparatus has the feature of fabricating easy, compacting the structure, requiring less space, and cheap in cost etc., which it can be the different types of configuration for different circumstance application, which it can be not only utilized in a general laser spectrum shaping and spectrum modulation, but also can be utilized for a high energy and ultra-high peak-power laser system in chirped pulse amplification with a large caliber and with a chirped pulse bandwidth of a few nanometers.
Abstract:
A device for detecting gas concentrations includes a movable coded filter. An optical element is positioned to receive gas filtered light and spectrally separate the gas filtered light. A photo detector is positioned to receive the spectrally separated light through slits in the moveable coded filter to provide an AC signal representative of a selected gas.
Abstract:
A system and process for automatically characterizing a plurality of external cavity semiconductor laser chips on a semiconductor laser bar separated from a semiconductor wafer. The system includes a diffraction grating and a steering mirror mounted on a rotary stage for rotating the diffraction grating through a range of diffraction angles. A laser bar positioning stage for automatically aligning each laser chip in a laser bar with the diffraction grating. Reflecting a laser beam emitted from a laser chip in a laser bar with diffraction grating and steering mirror to the laser analyzer. Automatically rotating the diffraction grating through a range of diffraction angles relative to the laser beam and automatically characterizing the laser optical properties such as spectra, power, or spatial modes with the laser analyzer at each diffraction angle.
Abstract:
Disclosed is a spectroscopic device that includes a light input unit to which light from a light source is input; optical elements; an optical deflection element; a reflector element that reflects the light emitted from the optical deflection element; and a photodetector. The optical deflection element includes a refractive index change region made of a material having an electro-optical effect and electrodes arranged to pinch the refractive index change region. The reflector element is a resonator filter having wavelength selectivity such that light having a predetermined wavelength is resonantly reflected.
Abstract:
An optical device includes: an image-forming optical system forming an image of light from a subject; an imaging unit receiving light of the image formed by the image-forming optical system; a reflection spectroscopic device covering a given area in an imaging area of the imaging unit; and a spectrum detection unit detecting a spectroscopic spectrum of light reflected by the reflection spectroscopic device.
Abstract:
Method and apparatus for analyzing radiation using analyzers and encoders employing the spatial modulation of radiation dispersed by wavelength or imaged along a line.