We report our recent study on the micromaser injected with ultracold cascade three-level atoms, including the general theory, the atomic emission probability in the micromaser cavity, the atomic transmission probability through the cavity, the photon statistics and the spectrum properties of the cavity field. It is shown that the micromaser cavity can be used as a velocity selector for ultracold three-level atoms, the photon statistics of the cavity field can be sub-Poisonian under some conditions, the linewidth can be broadened and the cavity-frequency can be either red-shifted or blue-shifted.
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