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1. Physics and applications of THz electromagnetic waves
1.1 Terahertz waves
The boundaries of the THz domain are not rigorously defined, but rather the subject of consensus. It is accepted that this domain extends between the microwave and mid-infrared (MIR) frequencies, over the spectral range 100 GHz to 10 THz. These "round" numbers have the advantage of being easy to remember. In view of the increasing frequency of microwave techniques, some people are now pushing the lower limit towards 300 GHz. We use the following relationships between photon energy E and frequency f, wavelength λ, or equivalent temperature T :
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Physics and applications of THz electromagnetic waves
From Heinrich Rubens to the 21st century: a brief history of THz sources
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Alpes Lasers SA, Avenue des Pâquiers 1, 2072 St-Blaise, Switzerland Lasers QCL http://www.alpeslasers.ch
ACST GmbH, Josef-Bautz-Strasse 15, DE-63457 Hanau, Germany Diodes, multipliers, antennas, waveguides, etc.
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