7. Optical continuous THz sources
This section describes THz lasers and optical frequency mixing sources. Recall here that lasers require stimulated emission between a high-energy level and a lower-energy level, the latter needing to be less populated than the high-energy level for amplification to occur. The emission wavelength corresponds to the energy difference between these two levels. For THz radiation, these levels must be separated by a few meV. Either the rotovibrational levels of molecules in gaseous form must be used, or artificial structures must be created whose energy levels are defined by their geometric shape.
7.1 Molecular lasers
Molecular lasers were invented by Chang and Bridges of Bell Laboratories in 1970. These lasers involve transitions between rotational energy sublevels...
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Optical continuous THz sources
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