Generation of Fock states in the micromaser

The recent observation of trapping states in the micromaser not only gave strong indications that the cavity field was quantized but also that the field was held in a number state or Fock state for long periods of time. We extend this measurement to show that under achievable experimental conditions, steady-state Fock generation is possible. Additionally, we show how the cavity field can be projected onto a number state using state reduction and then probed to determine the field state.