  We present a theory which can explain the micromaser as well as its optical
counterpart, the microlaser, for appropriate values of dissipative parameters.
We show that, in both the the cases, the cavity radiation fields can have
sub-Poissonian photon statistics. We further analyse if it is possible to
attain a Fock state of the radiation field. The microlaser is precluded for
such analysics due to the damping of its lasing levels making transitions at
optical frequencies. Hence, we focus our attention on the micromaser and our
exact simulation of the dynamics shows that it is not possible to generate a
Fock state of the cavity radiation field.
