Conditions of availability of the Markoff approximation for the description of cooperative spontaneous emission
Abstract
We show that the conditions of validity of the Markoff approximation for the description of cooperative spontaneous emission depend on the Fresnel number associated with the radiating system. Let SλL be the Fresnel number, where S and L are, respectively, the section and the length of the radiating system, and λ is the radiation wavelength. In the case of large Fresnel numbers, we find that the characteristic time τR of the cooperative emission of radiation must be much greater than Lc; but for small Fresnel numbers, we show that τR must be much greater than Sλc.
- Publication:
-
Physical Review A
- Pub Date:
- October 1975
- DOI:
- 10.1103/PhysRevA.12.1725
- Bibcode:
- 1975PhRvA..12.1725R