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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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WO/1998/021546A1 |
The invention is a method and apparatus for determining the phase difference of light waves (31) after propagating through each of one or more two-path pairs, a two-path pair being two optical transmission paths connecting a common entry...
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WO/1998/017969A1 |
A reference system for an optical wavelength scanner, used for measuring wavelengths of radiation from an optical device (12, 13, 14). The system utilizes a wavelength reference comprising a fixed fiber Fabry-Perot (FFP) filter (7) in co...
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WO/1998/017968A1 |
A multi-wavelength reference for use in identifying and measuring wavelengths of radiation from an optical device. The invention provides an interferometer (6) to generate a comb (50) of accurately spaced peaks spanning a selected wavele...
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WO/1998/010255A1 |
The invention concerns a method and corresponding device for determining the phase- and/or amplitude data of an electromagnetic wave. In order to bring about the spatial depth resolution of the image data obtained with such a method, the...
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WO/1998/008214A1 |
A method and apparatus for measuring fluctuations in the refractive index of a gas, such as air, in a measurement path (66) may be used to measure displacement of an object (67) independent of these fluctuations. A coherent source of lig...
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WO/1998/008047A1 |
A method and apparatus for measuring fluctuations in the refractive index of a gas, such as air, in a measurement path (66) may be used to measure displacement of an object (67) independent of these fluctuations. A coherent source light ...
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WO/1998/005933A1 |
The invention concerns a double-beam interferometer (1) for electromagnetic radiation and a method for the compensation of dispersion or increase in the spectral resolution of such an interferometer. Using a polarizer (8), which is broug...
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WO/1997/027500A1 |
A radiation field analyzer (10) provides means for analyzing the spatial mode spectrum of radiation received from a scene. In a multimode waveguide embodiment, light from a laser (24) is directed towards a scene through an alumina wavegu...
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WO/1997/027468A1 |
A low-coherence interferometric device for examining a sample (15), especially for multi-dimensional imaging, with an interferometer arrangement (2) comprising a low-coherence light source, an irradiation head (9) with a light outlet (16...
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WO/1997/021989A1 |
A geometric sensor includes a Monolithic Lenslet Module (MLM) subaperture array (22) having a plurality of microlenses (40), each of which have an opaque center marking formed concentric with the micolens optical axis (44), at the locati...
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WO/1997/012225A1 |
An improved integrated optic interferometric sensor uses a planar waveguide to offer detection sensitivity equal to the Mach-Zehnder interferometric sensor, while retaining the input coupling and manufacturing ease characteristic of a pl...
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WO/1997/005679A1 |
A method and device for wavelength locking is provided, wherein an element having a wavelength dependent characteristic such as a Fabry Perot etalon is used to provide an output signal having an intensity that varies with wavelength. The...
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WO/1996/036858A2 |
An incident optical signal is captured by an array of apertures and directed to pairs of fibers, each pair having a delay fiber with a unique length and a no-delay fiber. Each pair of fibers further has a unique transmission characterist...
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WO/1996/035973A1 |
The invention pertains to the field of controllable optics and can be used for manipulating a radiation wave front or for correcting phase distortions in optical equipment and in a wide range of systems including industrial laser systems...
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WO/1996/033535A1 |
An optical frequency generator has an optical comb generator (1) with which because of optical non-linearities around a central frequency a plurality of sidebands may be generated whose frequency spacing is given by the sending frequency...
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WO/1996/027121A1 |
The invention relates to industrial physics, in particular to the class of devices used for investigating the internal structure of objects, and can be used in medicine for diagnosis of the state of individual organs and systems in a hum...
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WO/1996/025656A1 |
A device comprising parallel input (2) and output (5) microguides with a planar guide therebetween defining a transition region (10). An optical tunnel effect provides coupling between the planar guide and the microguides. The transition...
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WO/1996/024032A1 |
The preferred embodiment of the invention includes a large telescopic imaging system used in the open atmosphere. An object (20) is being imaged by a telescope (6) with an atmosphere (3) distorting the light wavefronts (18) emanating fro...
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WO/1996/017221A1 |
An interferometer system in which a linearly polarized beam (10) from a light source (12) passes through a density filter (14). The beam (10) then passes through a half-wave retardation plate (16) which produces two orthogonally polarize...
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WO/1996/011387A1 |
The invention relates to an interferometer comprising a beamsplitter (10), a mirror (11) for retroreflecting beams (S1, S2), at least one pair of mirrors (12, 13) made up of two plane mirrors for reflecting the beams (S1, S2). The pair o...
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WO/1996/007224A1 |
Temperature compensation method and apparatus for wave meters and tunable lasers controlled thereby which avoids the necessity of maintaining a good vacuum in the wave meter housing and which provides the quick establishment of wavelengt...
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WO/1996/007085A1 |
Calibration of a wavelength adjustment mechanism (104) of a laser is achieved using a hollow cathode absorption lamp (114). The lamp is provided with a vaporous material having a precisely known wavelength of maximum absorption. A photo-...
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WO/1996/006335A1 |
A device for carrying out spectroscopic measurements based on the principle of interferometry has a matrix of photodetectors. A plurality of interferometers consist each of two partially transparent parallel mirrors arranged in a rectang...
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WO/1996/006472A1 |
The invention concerns the generation of synthetic light wavelengths in which light from a first light source (D1) is coupled into a common light path section (LG1) and its average frequency value ('nu'1) is locked with a resonant freque...
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WO/1996/002009A1 |
A method and an apparatus are provided for the determination of a condition or state of an object based on quasi-elastic interaction between the object and light transmitted to the object. This light is transmitted from a light source th...
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WO/1995/033971A1 |
An apparatus and method for acquiring an at least one dimensional digital image of a region of an object (28) using an optical source (12) which outputs a first optical beam having a short coherence length. A splitter (22) splits the fir...
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WO/1995/024621A1 |
The invention concerns an optical detection system for coherence mapping of a field of view wherein the received light is separated into a plurality of pixels and interference means process, the light from each pixel as a function of pat...
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WO/1995/020144A1 |
An optical wavelength sensor consists of a wedge shaped Fabry Perot etalon (4) which exhibits resonance for different optical wavelengths across its width (X), and an array of detectors xn that detects the spatial disposition of resonant...
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WO/1995/012802A1 |
A wavelength meter (10) for measuring the wavelength of laser light includes a diffraction element (52) for diffracting the light and a glass plate interferometer (60) in light communication with the diffraction element (52) for generati...
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WO/1995/011432A1 |
This invention aims at obtaining stable reference light by using a low-voltage mercury lamp as a reference light source and 253.7-nm line emitted by a lamp in which at least 49 % specific isotope of mercury is sealed.
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WO/1995/010759A1 |
A spectral wavelength discrimination system and method are provided which allow the wavelength of a beam of radiation to be accurately determined. The system is useful for identifying the emission wavelength of a multi-component marker s...
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WO/1995/010907A1 |
A cryptographic receiver (10) includes photon detectors (52, 54, 56, 58) arranged to detect photons arriving from filters (22) and (24). A fibre coupler (14) randomly distributes each received photon (16) from an optical fibre to one of ...
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WO/1994/018525A2 |
A spectrum stabilizer for stabilizing with respect to wavelength an emission spectrum of electromagnetic waves emitted by a source for insertion into a selected optical system where the source can have that emission spectrum shifted over...
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WO/1994/016294A1 |
Apparatus for measuring displacements of an object to nanometer accuracy, particularly for use in fabricating modern signal processing components. This comprises a radio frequency source for a primary electrical signal (50), a transducer...
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WO/1994/016310A1 |
Ellipsometer comprising at least a Zeeman laser (Z) to generate two beams (g1, g2) which are slightly shifted in frequency and (after transmission through a birefringent crystal (quarter-wave plate)) are both polarized linearly but perpe...
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WO/1994/011716A1 |
An apparatus and method of wavelength detection and parameter sensing uses a variable magnetic field applied to a Faraday effect thin magnetizable film to perform spectral analysis based on detected intensity distribution of diffracted l...
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WO/1994/010552A1 |
Process for measurement of the difference between the refraction indexes of two media, each crossed by a light beam. Said beams are capable of generating an interference figure consisting of fringes, the shift of the latter being measure...
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WO/1994/005967A1 |
An interferometric measurement scheme utilizing squeezed light wherein an input pulse is split (14) into two consecutive input pulses (15a, 15b) separated by a time interval that is less than the inverse spectral width of GAWBS. The two ...
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WO/1994/004894A1 |
An object of this invention is to provide a compact and low-cost optical wavelength measuring instrument, in which mechanical movements are eliminated to improve reliability, measuring speed and measuring accuracy. The optical wavelength...
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WO/1994/000733A1 |
This invention provides apparatus for and a method of interferometrically inspecting a surface of an object. The invention is particularly well suited for inspecting semiconductor devices in the sub-micron range. A two beam interference ...
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WO/1993/023726A1 |
A solid-block homodyne Doppler interferometer utilizing continuous-wave or pulse-wave light beam technology. The invention eliminates the need for individually supported mirrors and beamsplitters. In lieu of such beamsplitters, a glass p...
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WO/1993/022584A1 |
The invention relates to a gear-casing, especially for an angular, e.g. worm, gear, with a cylindrical passage (1) running along an extruded section forming the casing (2) which has external grooves (3) opening into plane external surfac...
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WO/1993/022637A1 |
An interferometer with an interferometer head (5) to which laser light is taken from a laser light source is taken by a flexible optical fiber (3). The head (5) has a beam divider (8) to divide the laser light into a measuring beam and a...
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WO/1993/020430A1 |
An apparatus useful in immunoassay of a fluid, light is directed to an optical sensor wherein the light is transmitted to a replaceable optical device that is responsive to index of refraction in a sensing region thereof that is exposed ...
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WO/1993/020416A1 |
A phase detection deflectometer-type optical device. Between the grating and the CCD camera, a primary lens (19) with a large entrance pupil provides an intermediate image on a ground glass (20), and the intermediate image passes through...
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WO/1993/017311A1 |
The object of the invention is a shearing measuring head with a very compact construction owing to the use of concave mirrors in a Michelson interferometer arrangement, which permits phase shifts and may if desired be operated with an up...
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WO/1993/014374A1 |
The structure of the invention serves to support mirrors (106) defining a reflective channel (108, 110) which can dynamically be reciprocally widened and narrowed, as in a two-beam interferometer. It is effectively divided, by pivot poin...
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WO/1993/013428A1 |
A current sensor which makes use of the Faraday effect, which is patterned on a Sagnac interferometer and which employs a coil of spun birefringent optical fibre for sensing the magnitude of current flowing through a conductor about whic...
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