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FIZIKA A 10 (2001) 1 , 1-12
 
COHERENTLY PUMPED MICROMASER AS A MASER WITHOUT INVERSION
M. SOLTANOLKOTABI and M. H. NADERI
Department of Physics, Faculty of Sciences, Isfahan University, Isfahan,
Iran
Received 22 August 2000; revised manuscript received 4 April 2001
Accepted 7 May 2001
In this paper, we use microscopic maser theory developed by Filipovicz, Javanaien and
Meystre [Phys. Rev. A 34, 3077 (1986)] to investigate the properties of the coherently
pumped two-level micromasers. We find that under right conditions, the initial atomic
coherence locks the field phase and unlike ordinary lasers and masers there is no longer
threshold. Consequently, the population inversion is not necessary.
PACS numbers: 84.40.Ik
UDC 535.374
Keywords: two-level micromaser, coherent pumping, locking of the field phase, no
threshold, population inversion unnecessary
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