Abstract:
A reflective optics system (RFO) that preferably requires the presence of both convex (M3) and concave (M4) mirrors that have beam reflecting surfaces, the application of which achieves focusing of a beam of electromagnetic radiation onto a sample (OB), (which can be along a locus differing from that of an input beam (IB)), with minimized effects on a polarization state of an input beam state of polarization based on adjusted angles of incidence and reflections from the various mirrors involved (M1) (M2) (M3) (M4).
Abstract:
Describes methods and systems for vicarious polarimetric calibration and performance validation of a remote sensor. The system includes a plurality of reflective mirrors configured and arranged to reflect radiation from a source of radiation onto the remote sensor with accurately known polarimetric properties. Each of the reflective mirrors are located so that the target images do not overlap. The remote sensor is configured to receive the radiation reflected from the plurality of reflective mirrors and store the received radiation as image data (e.g., the image of each mirror appears as a point target). The system includes a processor configured to process the received data to provide direct calibration and performance validation for each polarimetric or spectral channel of the remote sensor. In addition, the calibration method removes all atmospheric effects except for transmittance and provides reference targets that have high polarimetric contrast, full spectrum performance and easy to deploy.
Abstract:
The subject matter disclosed herein pertains to a method for screening drugs using second-harmonic generation microscopy. The tissue is scanned with a pulsed laser light which has an excitation wavelength. At least some of microtubules within the tissue produce generated light with a second-harmonic wavelength that is half the excitation wavelength. A microtubule pattern within the tissue is determined based on an analysis of the generated second-harmonic wavelength.
Abstract:
L'invention concerne un dispositif (1) de mesure de l'état de polarisation d'une onde incidente de fréquence de 10GHz à 30 THz, comportant un transistor à effet de champ (2), une antenne (3) de réception. Suivant l'invention, les parties (31, 33) d'antenne détectent une composante de polarisation de l'onde, colinéaire à une direction (X) provoquant dans le transistor (2) une tension alternative (Us) de détection, les parties (32, 33) détectent une composante de polarisation de l'onde, colinéaire à une direction (Y) provoquant l'apparition dans le transistor (2) d'une tension alternative (Ud) de détection, le transistor (2) étant agencé pour générer, comme signal électrique (ΔU) de détection entre la borne (21) de source et la borne (22) de drain, une tension continue (ΔU) de détection dont une partie est déterminée par l'état de polarisation elliptique de l'onde par interférence dans le transistor (2) entre les tensions alternatives (Us, Ud).
Abstract:
Ellipsometry systems and ellipsometry data collection methods with improved stabilities are disclosed. In accordance with the present disclosure, multiple predetermined, discrete analyzer angles are utilized to collect ellipsometry data for a single measurement, and data regression is performed based on the ellipsometry data collected at these predetermined, discrete analyzer angles. Utilizing multiple discrete analyzer angles for a single measurement improves the stability of the ellipsometry system.
Abstract:
A circular polarisation spectrometer is disclosed comprising a source (1) of essentially monochromatic electromagnetic radiation preferably in the infrared range, an element (21, 37-45) for the generation of altematingly left and right circularly polarised radiation therefrom, and at least one detector (7) for detecting radiation transmitted by a sample to be analysed spectroscopically in terms of differential absorption of left and right circularly polarised radiation. The spectrometer is versatile and allows compensation of almost any otherwise detrimental offset effects if the element (21, 37- 45) for the generation of altematingly left and right circularly polarised radiation is an electro-optical device in which by means of the application of voltage and a correspondingly generated electric field the birefringence can be adapted as a function of time.
Abstract:
The present invention provides the capability of ascertaining, through a quick and simple measurement, locations on a structure that may have experienced damage that could result in reduced structure lifetime, strength, or reliability. The sensing element is a connectorized section of polarization maintaining ("PM") optical fiber, where a length of PM fiber represents a fully distributed sensor array. Stress-induced changes to the sensor are measured through white-light Polarimetric interferometry. The output of the measurement is a data array representing the stress concentration magnitude at an array of locations along the length of the sensor. In an application, the knowledge of the optical fiber position on the structure, coupled with the measurement of stress locations along the fiber length, allows the user to determine locations on the structure with large stress concentrations. These locations may signify structural damage. This knowledge would allow the user to employ a more sophisticated system, albeit a larger and slower one, to fully characterize and evaluate that area of potential damage and take appropriate action.
Abstract:
An Optical communications apparatus, comprising: (a) an optical integrated device comprising an input, one or more integrated optical component(s) and an output, arranged such that light received by the input is propagated by the optical component(s) and exits the device as an output light beam; (b) a light beam diverter arranged to divert a sample portion only of the power of the output light beam; (c) a light detector arranged to detect the sample portion of the output light beam; and (d) a polariser located between the light beam diverter and the light detector and/or between the output of the optical integrated device and the light beam diverter, the polariser being arranged such that if light of a predetermined polarisation is received by the optical integrated device, the polariser propagates light of that polarisation only, thereby substantially to prevent light other than of the predetermined polarisation being detected by the light detector.
Abstract:
L'invention concerne un support destiné à l'observation entre polariseurs croisés d'un objet placé à son voisinage dans un milieu (3) d'indice n 0 avec un éclairage incohérent convergent incident sous un angle θ 0 à une longueur d'onde λ. Ledit support comprend un substrat (1) d'indice de réfraction complexe n 2 et une couche (2) d'indice de réfraction complexe n 1 et d'épaisseur e 1 . Selon l'invention, la valeur de l'épaisseur e 1 de la couche (2) est à 2% près telle que (I) avec (II). L'invention concerne aussi des dispositifs d'observation incorporant un tel support.