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WO/2001/003258A1 |
This invention provides a method and an optical system for sensing and controlling the frequency for a laser with respect to an optical cavity and for sensing and controlling the length difference of interferometer paths in a two beam in...
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WO/2001/002799A1 |
A birefringent interferometer system is described which uses nematic liquid crystal cells (30, 32) to produce variable optical path differences (OPD) between light of different polarization states that are interfered at a polarizing anal...
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WO/2001/002822A1 |
A Shack-Hartmann wavefront sensor having an aperture which is smaller than the size of an object being measured is used to measure the wavefront for the entire object. The wavefront sensor and object are translated relative to one anothe...
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WO/2000/077482A1 |
In a method for influencing and measuring pulsed electromagnetic illumination, e.g. parallel laser light (L), said illumination or light can be spatially divided, in particular, in an autocorrelator comprising a beam receptor (12), can b...
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WO/2000/075721A1 |
An optical analogue to digital (A/D) converter for converting an input analogue voltage signal into a digital output, comprising means for frequency modulating an optical signal with an input analogue voltage signal, delay means for spli...
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WO/2000/065303A1 |
Displacement measuring interferometers DMI (414) are disclosed for use in conjunction with apparatus (410) for measuring and monitoring the intrinsic optical properties of the gas in the measurement leg of the DMI (414) to compensate for...
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WO/2000/065300A1 |
A cavity ring-down system for performing cavity ring-down spectroscopy (CRDS) using optical heterodyne detection of a ring-down wave (ERD) during a ring-down phase or a ring-up wave (ERU) during a ring-up phase. The system sends a local ...
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WO/2000/062026A1 |
The invention relates to a device for optical spectroscopy with means for generating an interference pattern and with a spatially resolving detector that can receive the generated interference pattern. According to the invention, the wav...
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WO/2000/059368A1 |
The invention concerns a device for observing a body, in particular a viewer, comprising means for illuminating (12) the body (5), means for sampling (400, 450, 500, 700) light coming from an illuminated site (01) of the body and compens...
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WO/2000/055948A1 |
The invention relates to a method for operating a laser device (1) comprising a resonator array (3). Continuous light pulses are generated in the resonator array (3), each consisting of spectral components which correspond to a plurality...
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WO2000014513A9 |
Multiple independent spectral measurements of light reflected from a target are produced concurrently by illuminating the target with a train of laser pulses wherein the train of pulses produces a line spectrum within the illuminating si...
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WO/2000/042401A2 |
The invention concerns the analysis of an optical wavefront. The inventive device comprises in particular an array (ML) of micro-lenses (L¿i?), a detector (DET) and signal processing means. Each micro-lens (L¿i?) defines a sub-soft ape...
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WO/2000/033021A1 |
The object of this invention is to provide a method for improving the accuracy of measurements, distance measurements in particular, made using a laser interferometer (1, 2). The method according to this invention consists of determining...
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WO/2000/026622A1 |
A method and apparatus for quantitative determination of the phase of a radiation wave field is disclosed. A representative measure of the rate of change of intensity of the radiation wave field over a selected surface extending generall...
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WO/2000/023764A1 |
Interference elements (112, 116, 122) are disclosed for measurement of wavelength in optical devices (100). They may be used for display, monitoring, control or locking of optical signal sources. They may be used to determine relative an...
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WO/2000/022393A1 |
A multiport bidirectional coupler (31) is interconnected to a two beam interferometer (30), such as a Sagnac interferometer. Light from a source (40) is input into each of the ports (32-34) of the coupler (31) in turn. For each input the...
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WO/2000/017613A1 |
An optical phase detector comprising coupling means for receiving two optical inputs and for producing two combined optical outputs, means for detecting the two combined optical outputs and producing two corresponding electrical signals,...
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WO/2000/017612A1 |
The wavefront sensing device consists of a light source, a binary phase mask (10), a fixed focus lens (11) and at least two finite sized spatially separated detectors (12) positioned in the plane of focus of the wavefront sensing device....
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WO/2000/011430A1 |
Apparatus and methods for inspecting or testing a sample using shearography techniques make use of a laser shearing interferometer including: means for scanning a line of coherent radiation over a sample, means for generating two lateral...
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WO/2000/009978A1 |
The invention concerns an apparatus for measuring a light beam wavelength comprising at least a Fizeau wedge (18, 20) delimited by first and second plates, means (30, 32) for high resolution detection of interference fringes resulting fr...
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WO/1999/066308A1 |
An automated apparatus and method for measuring properties of optical components based on wavefront sensing and analysis. A wavefront of predetermined profile is directed at a surface (26) to be measured so that it is more or less distor...
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WO/1999/060679A1 |
The present invention provides a reliable modular production quality excimer laser capable of producing 10 mJ laser pulses in the range of 1000 Hz to 2000 Hz or greater. Replaceable modules include a laser chamber (211); a pulse power sy...
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WO/1999/060629A1 |
The invention relates to a device for detecting the phase and amplitude of electromagnetic waves. The device comprises at least two modulation photo gates (1, 2) which are sensitive to the electromagnetic waves. The device also comprises...
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WO/1999/057650A1 |
The invention concerns a method for reconstructing a surface (Y) by a set of measurements on sites (S), using a linear prediction in points (X) located outside said sites (S). The method consists in using measurements of geometric variab...
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WO/1999/050628A1 |
This invention relates to optical devices such as a fiber-optic frequency shifter and an optical interferometer. This invention also relates to a method of generating optical interference signals to obtain reliable sensor signals indepen...
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WO/1999/044009A1 |
The invention relates to an interferometric measuring device (1) for determining the profile of rough surfaces. A spatially coherent beam generating unit is provided. Said unit emits temporally briefly coherent wideband radiation. The de...
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WO/1999/042787A1 |
A method and apparatus for measuring fluctuations in the refractive index of a gas, such as air, in measurement path (298) comprising light sources (1) for providing two light beams (9, 10) with different wavelengths along the measuremen...
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WO/1999/042786A1 |
Interferometric apparatus and method for measuring and monitoring intrinsic optical properties of a gas with an electronic apparatus (109) and a differential plane mirror interferometer (69, 70), especially the reciprocal dispersive powe...
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WO/1999/042785A2 |
The invention employs multiple pass interferometry (69, 70, 90) to provide measurements of dispersion of the refractive index(n), the dispersion being substantially proportional to the density of the gas, and/or measurements of dispersio...
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WO/1999/041576A1 |
The invention concerns an iterative method for determining the distribution of intensity and phase in a plane consisting in: measuring the intensity I¿i?, i = 1....N, of the beam, in N planes, N $m(G)3, including the plane wherein it is...
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WO/1999/040392A1 |
Leakage optical signals injected into a time division multiplexed sensor system are modulated during off periods in the duty cycle in the sensor interrogation signal. The leakage light is modulated such that its unwanted contributions to...
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WO/1999/031460A1 |
The light wavelength measuring device using a modulated Mach-Zehnder interferometer (1) includes a modulator controlling the interferometer (1) by means of a modulation signal (x¿mod?) at the points of inversion of its characteristic li...
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WO1999018520B1 |
A method for deriving a spectrum of a substance in such a manner as to enhance a specified characteristic of the spectrum. Irregular intervals are chosen in the signal domain for sampling the signal. The irregular intervals may be random...
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WO/1999/018466A1 |
The spherical aberration of an optical beam is determined by focusing the beam, and dividing its cross section in at least two concentric zones (50, 51). The sub-beams passing through the zones are focused each on a focus-detection syste...
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WO/1999/015867A1 |
The invention concerns the field of wavefront analysis. It concerns a method and a device for measuring optical wavefront shape parameters, based on the line by line analysis of the wavefront. The method comprises at least one step (ACQÂ...
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WO/1999/013291A1 |
A system for interferometric inspection of an object (140) includes a number of improvements to reduce spurious reflections and provide precision measurement of large objects. A neutral density filter of absorptive glass is used as an at...
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WO/1999/012009A1 |
The present invention provides a laser interferometer including: laser means (1) for provision of two light pulses separated by a time interval; phase modulator means (2) including means for: splitting each pulse into a pair of sub-pulse...
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WO/1999/006794A1 |
Amplitude and phase relative to an interferometrically established phase of ultrashort replica pulses (15) utilizes spectral phase interforemetry for direct electric field reconstruction by frequency shifting chirp replica pulses (16) of...
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WO/1999/006852A1 |
An energy beam threat discrimination system (110) adapted for use with laser beam energy (134). The system (110) includes a first detector (114) for detecting a first laser signal. A second detector (112) detects a coherent laser signal....
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WO/1999/005491A1 |
A method for measuring the wavelength of light, particularly short pulses of light, with improved accuracy comprises passing the light down a backscatter medium such as an optical fibre and detecting and measuring the wavelength of the b...
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WO/1999/004467A1 |
The invention uses known atomic or molecular absorptions as absolute wavelength standards for calibrating wavelength measurement instruments (105) used in tunable lasers (103). Examples of atomic and molecular absorptions are carbon and ...
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WO/1999/002939A1 |
A spectrometer includes an actuator assembly, a mobile mirror assembly (13) responsive to the actuator assembly, a balancing element (20) responsive to the mobile mirror assembly (13), and a suspension mechanism (21) operatively connecte...
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WO/1998/054542A1 |
The invention relates to an interferometric measuring device for measuring form on rough surfaces of an object, comprising a unit for producing a beam, said unit emitting a short-coherent beam and a beam-splitting device for producing a ...
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WO/1998/052021A1 |
An apparatus for performing high speed scanning of an optical delay and its application for performing optical interferometry, ranging, and imaging, including cross-sectional imaging using optical coherence tomography, is disclosed. The ...
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WO/1998/043054A1 |
The invention relates to a device and process for extinguishing a source. Said device comprises an interferometer (2) which receives an incident light beam (10) emanating from a central point source. The interferometer has a separator (4...
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WO/1998/036252A1 |
A device for accurate and repeatable measurements of optical wavelengths, including an interrogation broadband light source (1) and a tuneable optical filter (2). A first part of the light is, in either order, transmitted through the fil...
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WO/1998/036237A1 |
Fourier filtering of measurement variable differences resulting from differences in said measurements is carried out in order to determine measurement variables using a specially included transfer function providing that the transfer fun...
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WO/1998/035493A2 |
Measurement of the optical transfer function of an optical system (Fig. 11A, 11B, 11C) imaging a bar pattern (Fig. 6). A one dimensional fast Fourier transform processes sampled image data from the bar pattern (Fig. 6). A model of the sy...
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WO/1998/027863A1 |
An apparatus for improving vision and resolution of retinal images comprises a point source produced on the retina (101) of a living eye (100) by a laser beam (102). The laser beam reflected from the retina is received at a lenslet array...
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WO/1998/027446A2 |
The invention is a temperature compensating structure for a fiber Bragg grating (FBG) contained in optical fiber (11). The structure comprises two plates (12, 13) made of material having different temperature coefficients of expansion an...
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