The phase evolution of a micromaser field without the rotating-wave approximation

Zheng‐Dong Liu, Liang Zeng, Shi Yao ZHU, Thomas F. George

Research output: Contribution to journalJournal articlepeer-review

2 Citations (Scopus)


In a one-atom micromaser, the expression for the density matrix of the cavity field without the rotating-wave approximation (RWA) is derived using a perturbation method. The phase evolution of the cavity field is investigated without the RWA, and the results are compared with those within the RWA. It is shown that the virtual-photon processes make the symmetric phase distribution in the RWA asymmetric and cause additional quantum oscillation, which indicate the field's phase fluctuation and frequency shift. Virtual photons also cause an extra phase distribution to the field which is initially in a vacuum state. The unique characteristic of the phase properties in the course of forming a photon-number state is investigated. Other new phenomena such as the undamped oscillation of the phase variance against the injected atomic number are found.

Original languageEnglish
Pages (from-to)2473-2485
Number of pages13
JournalJournal of Modern Optics
Issue number12
Publication statusPublished - Dec 1998

Scopus Subject Areas

  • Atomic and Molecular Physics, and Optics


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