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Terahertz Spectrometer

Photonics Spectra
Mar 2011
TOPTICA Photonics AGRequest Info
 
Toptica Photonics AG has introduced a fast, compact next-generation terahertz spectrometer system with continuous-wave 1.5-μm lasers. The frequency-domain spectrometer combines the company’s new TeraBeam, a highly integrated two-color diode laser, with newly developed InGaAs/InP emitter and detector technology from Fraunhofer Heinrich-Hertz Institute in Berlin. The system features a scan option that reduces acquisition times by more than two orders of magnitude and that can acquire a complete terahertz spectrum from 50 to 1200 GHz, with subgigahertz resolution in <1 min. Traditionally, research in the field of frequency-domain continuous-wave terahertz has largely been carried out with GaAs photomixers, requiring laser wavelengths below 870 nm, a suitable but costly technique.


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GLOSSARY
detector
1. A device designed to convert the energy of incident radiation into another form for the determination of the presence of the radiation. The device may function by electrical, photographic or visual means. 2. A device that provides an electric output that is a useful measure of the radiation that is incident on the device.
emitter
A source of radiation.
photoconductor
A light-sensitive resistor in which resistance decreases with increase in light intensity when illuminated. The device consists of a thin single-crystal or polycrystalline film of compound semiconductor substances.
spectrometer
A kind of spectrograph in which some form of detector, other than a photographic film, is used to measure the distribution of radiation in a particular wavelength region.  
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