Coherent thermal radiation

@article{Greffet2007CoherentTR,
  title={Coherent thermal radiation},
  author={J. Greffet and C. Henkel},
  journal={Contemporary Physics},
  year={2007},
  volume={48},
  pages={183 - 194}
}
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… Expand
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