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4. Glossary
Antenne photoconductrice; photoconducting antenna
Device integrating two metal electrodes deposited on an intrinsic semiconductor substrate. When emitted, these electrodes are biased by a DC voltage. By illuminating the gap between the electrodes with a pulsed laser, the photogenerated carriers in the substrate are accelerated by the applied voltage and radiate a very short-lived (sub-picosecond) electromagnetic signal into space. In detection mode, the device is not polarized, but the carriers are accelerated by the electric field of a concomitantly arriving terahertz signal. The current measured is proportional to this terahertz field.
Frequency beating
Technique for generating a sum or difference of frequencies by illuminating a material or non-linear component with two laser beams of different wavelengths. This...
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Glossary
Bibliography
Websites
FEL (Free Electron Laser) list
http://sbfel3.ucsb.edu/www/vl_fel.html
GCM Company
Labex FOCUS (Focal Plane Arrays for Universe Sensing)
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