  Lima\c{c}on-shaped microdisk lasers are promising on-chip light sources with
low lasing threshold and unidirectional output. We conduct an experimental
study on the lasing dynamics of Lima\c{c}on-shaped semiconductor microcavities.
The edge emission exhibits intensity fluctuations over a wide range of spatial
and temporal scales. They result from multiple dynamic processes with different
origins and occurring on different spatiotemporal scales. The dominant process
is an alternate oscillation between two output beams with a period as short as
a few nanoseconds.
