Cavity size and detuning effects on threshold gain and oscillation frequency in a planar microcavity laser

The threshold condition of a one-dimensional planar microcavity laser with output coupling is analyzed semiclassically. The theory assumes homogeneous ly broadened atoms and a constant population inversion and the noise is neg lected. Modified expressions with relative corrections against conventional formulas for the oscillation frequency and the threshold gain for a planar microcavity laser are obtained. The relative corrections depend on the cav ity size and the detuning including its sign.