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We show that the steady-state photon-number distribution of the microscopic maser can be recovered using the standard macroscopic quantum laser theory. We introduce an appropriate limit of weak pump and weak photon damping to make the connection between the microscopic and the macroscopic quantum theory of laser operation. Simple analytic formulas describe the main features of the stationary photon-number distribution in the microscopic maser.
Lugiato et al. (Wed,) studied this question.