Danmarks Tekniske Universitet

Windar Photonics A/s

Technical University of Denmark

Christian Pedersen

Peter Tidemand-Lichtenberg

Jeppe Seidelin Dam

Peter John Rodrigo

Michael Linde Jakobsen

Steen Hanson

Jørgen Korsgaard Jensen

Nicolai Højer Sanders

Knud Palmelund Sørensen

Qi Hu

Theis Iversen

Peter Tideman-Lichtenberg

Emir Karamehmedovic

Lasse Høgstedt

Theis Faber Quist Iversen

Rene Skov Hansen

Peter Lichtenberg Tidemand

The invention provides an infrared upconversion spectrometer for determining a mid-IR spectrum of received infrared light with a high resolution. The spectrometer applies upconversion to transform light in the mid-IR to the near-IR range where efficient detectors are available. The up-conversion causes divergence of the light, and in addition, the invention applies an extra dispersive element to record a spectrum.

Infrared upconversion spectrometer for the mid-IR range

A system for measuring velocity of particles such as particles in air is a Light Detection and Ranging (LIDAR) system, having a micro-electro-mechanical-system (MEMS).

LIDAR based on MEMS

The invention relates to a coaxial direct-detection LIDAR system for measuring velocity, temperature and/or particulate density. The system comprises a laser source for emitting a laser light beam having a lasing center frequency along an emission path. The system further comprises an optical delivery system arranged in the emission path of the laser source, the optical delivery system being arranged for delivering the laser light beam in a measuring direction, the optical delivery system further being configured for collecting a return signal backscattered along the measuring direction. Finally, the system comprises a detector system arranged to receive the return signal from the optical delivery system, the detector system comprising a narrowband optical filter and a detector, the narrowband optical filter having a filter center frequency of a pass-band, wherein the center lasing frequency and/or the center filter frequency may be scanned. The invention further relates to an aircraft airspeed measurement device, and a wind turbine airspeed measurement device comprising the LIDAR system.

Coaxial direct-detection LIDAR-system

The present invention relates to a low-cost LIDAR system. The system may be integrated in a wind turbine for measurement of the approaching wind field. One embodiment relates to a LIDAR system comprising a beam generating section adapted for generating a substantially linearly polarized output beam, and a beam steering section comprising a first optical device for controllably altering the polarization of the output beam, said first optical device in optical connection with a first polarizing beam splitter, said beam steering section adapted for directing the outputbeam interchangeably between a first direction and a second direction.

Multiple directional LIDAR system

There is presented an up-conversion infrared microscope () arranged for imaging an associated object (), wherein the up-conversion infrared microscope () comprises a non-linear crystal () arranged for up-conversion of infrared electromagnetic radiation, and wherein an objective optical component () has an entrance pupil with a first diameter D, and an optical component system which is arranged for forming an external image () of the back-focal plane () of the objective optical component (), which has a diameter (given by the diameter of a circle enclosing all optical paths at the plane of the 10 external image) which is denominated Dand wherein Dis larger than a second diameter D.

Infrared up-conversion microscope

The present invention relates to a system and a method for processing electromagnetic radiation. In particular, the present invention relates to conversion of light, such as light () comprising image information (), from one wavelength interval to another wavelength interval. More in particular, the present invention relates to wavelength conversion of incident light () by means of optical mixing with a laser beam in a non-linear crystal (). The method according to the present invention comprises receiving incoming electromagnetic radiation () and a laser beam () in a non-linear crystal, setting a plurality of phase match conditions within the non-linear crystal (), obtaining a plurality of images of the processed electromagnetic radiation (), and providing a first combined image () comprising a first part of a first image and comprising a second part of a second image. The wavelength conversion is realized in an intra-cavity arrangement by for example sum-frequency generation between the intra-cavity laser light () and the in-coupled radiation ().

System and method for processing electromagnetic radiation

A multi-channel infrared spectrometer for detecting an infrared spectrum of light received from an object. The spectrometer comprises a wavelength converter system comprising a nonlinear material and having an input side and an output side. The wavelength converter system comprises at least a first up-conversion channel and a second up-conversion channel, and is arranged such that light traversing the wavelength converter system at different angles in the nonlinear material is imaged into different positions in an image plane. The first up-conversion channel is configurable for phase-matching infrared light in a first input wavelength range incident on the first side and light in a first output wavelength range output on the second side, and correspondingly, the second up-conversion channel is configurable for phase-matching infrared light in a second input wavelength range incident on the first side into light in a second output wavelength range output on the second side. The spectrometer further comprises a demultiplexer configured for demultiplexing light in the first up-conversion channel and light in the second up-conversion channel. The demultiplexer is located on the first side or the second side of the wavelength converter system. Finally, the spectrometer comprises a spatially resolved detector arranged in the image plane to detect light in the first output wavelength range and second output wavelength range output of the wavelength converter system.

Multi-channel up-conversion infrared spectrometer and method of detecting a spectral distribution of light

A vector velocimeter includes a laser emitting a measurement beam with a wavelength &#x3bb;, for illumination of an object in a measurement volume to create a signal beam, a reference beam generator generating a reference beam, and a first detector arranged such that the signal beam and the reference beam, propagating at a first angle &#x3b8; relative to the signal beam, are incident thereon. The first detector includes an array of first detector elements to convert the intensity of the interfering signal beam and reference beam incident thereon into an oscillating electronic detector element signal when the fringe pattern formed thereby moves across the first detector array. A signal processor generates a velocity signal corresponding to a first velocity component of movement of the object in the measurement volume in the longitudinal direction thereof based on the electronic detector element signals from each of the first detector elements.

Vector velocimeter

Processing of incoherent electromagnetic radiation is described, said incoming incoherent electromagnetic radiation comprising radiation in a first wavelength interval. An arrangement comprises a focusing arrangement for focusing the incoming incoherent electromagnetic radiation, a first cavity configured to comprise an intra cavity laser beam, a nonlinear crystal arranged in the first cavity such that it is capable of receiving the focused incoherent electromagnetic radiation and, in dependence on the spatial overlap between the focused incoherent electromagnetic radiation and the intra-cavity laser beam, by interaction with the intra-cavity laser beam provide processed electromagnetic radiation, said processed electromagnetic radiation comprising radiation in a second wavelength interval. In other words, such an arrangement is capable of enabling imaging, e.g. by utilizing a detector that is sensitive in the second wavelength interval, a source of radiation that emits incoherently in a first wavelength interval.

Optical arrangement and method

The present invention relates to a compact, reliable and low-cost coherent LIDAR (Light Detection And Ranging) system for remote wind-speed determination, determination of particle concentration, and/or temperature based on an all semiconductor light source and related methods. The present invention provides a coherent LIDAR system comprising a semiconductor laser for emission of a measurement beam of electromagnetic radiation directed towards a measurement volume for illumination of particles in the measurement volume, a reference beam generator for generation of a reference beam, a detector for generation of a detector signal by mixing of the reference beam with light emitted from the particles in the measurement volume illuminated by the measurement beam, and a signal processor for generating a velocity signal corresponding to the velocity of the particles based on the detector signal.

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Hvidovre, Denmark

Christian Pedersen