This antenna provides a gain of about 14 dB.

This innovation is an electronic device for automatically locking the frequency of a continuous-wave laser to an absorption peak of a gas line or Fabry-Perot cavity. The automatic capability of the device means that the laser need not be manually adjusted to be close to the absorption peak before engaging the frequency lock. An absorption feature within the tuning range of the laser can be detected and locked on to. Long-term stabilization to less than 3% of the linewidth of the absorption feature has been achieved for a diode laser locked to a gas absorption line. Flexibility is included in the design to any tunable continuous-wave laser including diode laser and solid-state lasers.