Photon statistics of a ground-state-pumped laser

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A model of three-level laser, in which the pumping excites the atoms from the lower lasing level, is considered. The statistical properties of the field are calculated using full quantum treatment. It is shown that apart from threshold there is additional critical value of the pump rate, at which the laser field behaves in a phase-transition-like manner: the photon number drops down, the Fano factor has a strong peak, the relative photon number variance grows enormously, and the second-order coherence function jumps to 2, which is typical for thermal light.

Original languageEnglish
Article number015802
Pages (from-to)1-4
Number of pages4
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number1
StatePublished - 1 Jan 2001


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