Danmarks Tekniske Universitet

Advalight

Peter Tidemand-Lichtenberg

Christian Pedersen

Jeppe Seidelin Dam

Morten Thorhauge

Jesper Liltorp Mortensen

Nicolai Højer Sanders

Lasse Høgstedt

Knud Palmelund Sørensen

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

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 laser system according to the invention comprises pump generating means (x, x) for generating at least a first and a second, preferably focused, pump beam, and lasing means (x, x) for emitting radiation by being appropriately pumped. The lasing means (x, x) is disposed in a first resonator so as to receive the first pump beam in order to generate a first beam (x) having a first frequency, and the lasing means (x, x) is disposed in a second resonator so as to receive the second pump beam in order to generate a second beam (x) having a second frequency. At least one Q-switch (x; x, x) is disposed in the first and the second resonator, so that the first beam and the second beam both pass a Q-switch (x; x, x). The laser system (x) has an output (x) generated from said first beam (x) and said second beam (x), and at least a part of said output (x) is fed back to a regulation system (x), said regulation system (x) controlling said pump generating means (x, x).

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Hørsholm, Denmark

Peter Tidemand-Lichtenberg