Filtern
Volltext vorhanden
- nein (1)
Erscheinungsjahr
- 2007 (1) (entfernen)
Dokumenttyp
Sprache
- Englisch (1)
Gehört zur Bibliographie
- ja (1)
Institut
Coherent thermal radiation
(2007)
The radiation emitted by a heated body is generally quoted as a typical example of incoherent radiation, in distinction to laser radiation. One is nearly isotropic, the other highly directional; one is spectrally broad, the other quasi-monochromatic. It may come as a surprise that the thermal radiation of a large number of substances is coherent, both in space and time, when it is observed at a distance from the body that is shorter than the wavelength. This behaviour can be understood within an electromagnetic approach to thermal emission. Several recent experiments have confirmed these unexpected properties.