Abstract:
Eine Infrarotstrahleranordnung für ein Gasanalysengerät besteht aus einem Strahlergehäuse, in dessen einseitig mit einem strahlungsdurchlässigen Fenster abgeschlossenen Innenraum ein plattenförmiger Keramikkörper (3) angeordnet ist, auf dem eine Heizwiderstandsschicht (4) aufgebracht ist. Um eine sichere und exakt definierte Halterung des Keramikkörpers (3) zu gewährleisten, ist dieser als gleichseitige Dreiecksplatte (5) ausgebildet, die mit ihren Dreiecksspitzen (6) an dem Innenumfang des Strahlergehäuses (1), vorzugsweise in einer Umlaufnut (7), gehalten ist.
Abstract:
A mid infrared spectrometer comprises a high brightness broadband source that generates an output with a broad spectral range in the order of hundreds of wave numbers, a wavelength dispersive element and a detector. In one embodiment, the source comprises an array of semiconductor laser devices operating simultaneously. Each device emits light at wavelength different from the wavelengths emitted by the other devices in the array and the devices are arranged so that the combined output continuously covers the broad spectral range. In another embodiment, each of the lasers in the array is a quantum cascade laser device. In still another embodiment, the quantum cascade laser devices in the array are operated in the regime of Risken-Nummedal-Graham-Haken (RNGH) instabilities. In yet another embodiment, each of the lasers in the array is a mode-locked quantum cascade laser device.
Abstract:
Apparatus for Terahertz wave generation. An amplified laser generates a pulsed optical fundamental beam and a crystal passes the fundamental beam to generate a second harmonic beam of the fundamental beam. A lens focuses the mixed fundamental and second harmonic beams and a gas cell containing water vapor receives the focused beams and generates Terahertz waves.
Abstract:
A tunable radiation emitting structure comprising a discontinuous conducting interface having periodic or quasi-periodic features, wherein the structure emits narrowband terahertz radiation when heated is disclosed.
Abstract:
An optical device including: a substrate (100) with a top surface and a bottom surface and a hole extending through the substrate from the top surface to the bottom surface; and a multilayered thin film structure (106) fabricated on the substrate and forming a membrane over the hole, the multilayered thin film structure including a thermally tunable thin film optical filter structure at least a portion of which is positioned over the hole.
Abstract:
A method of calibrating an absorption spectroscopy measurement wherein the calibration method includes projecting laser light throu a sample of a first quantity of a gas of interest and a second irrelevant quantity of a spectroscopically identical or similar gas (10). The first and second spectroscopic absorptions of the laser light are measured over specific first and second absorption lines. A functional relationship is determined between the first and second measured spectroscopic absorptions and two unknown variables. The function relationships may then be simultaneously solved to determine one or both unknown variables and thereby obtain a measurement relati to the first quantity of the gas of interest, calibrated for the second irrelevant quantity of gas.