  We report on the development of a diode laser system - the `Faraday laser' -
using an atomic Faraday filter as the frequency-selective element. In contrast
to typical external-cavity diode laser systems which offer tunable output
frequency but require additional control systems in order to achieve a stable
output frequency, our system only lases at a single frequency, set by the peak
transmission frequency of the internal atomic Farady filter. Our system has
both short-term and long-term stability of less than 1~MHz, which is less than
the natural linewidth of alkali-atomic D-lines, making similar systems suitable
for use as a `turn-key' solution for laser cooling experiments.
