generation in a correlated emission laser
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INTRODUCTION
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In recent years, a nondegenerate three-level laser has attracted a great deal of interest in relation to its potential as a reliable source of robust entangled light [@pra74043816; @jpb402373; @prl94023601; @pra75033816; @jpb41145501; @pra72022305]. The nonclassical features of the radiation are predominantely attributed to the atomic coherence induced by initially preparing the atoms in a coherent superposition of the energy levels between which a direct spontaneous transition is electric dipole forbidden [@pra74043816; @jpb402373] or by pumping the same with an external radiation [@prl94023601; @pra75033816; @jpb41145501; @pra72022305]. However, due to the fragility of the coherent superposition, the pertinent continuous variable entanglement is believed to be significantly ruined by various phenomena closely associated with the lasing process; noteworthy among many are dephasing and phase fluctuations. In practical situations, it is not possible to prepare the coherent superposition with an arbitrary perfection due to instability of the laser, faulty setups, and the inefficiency of the devices employed [@sinta; @pra79013831; @oc283781; @pra444688; @sint]. Even, in case one manages to prepare the coherent superposition somehow, it will subsequently decay due to the interaction with the surrounding [@pra79033810; @pra79063815]. Therefore, a study of the effects of the phase 