Stabilization of a composite-cavity single-frequency laser

A new method of stabilization for the composite-cavity-type single-frequency laser was examined experimentally. This method is insensitive to variations in oscillation power levels, and hence this type of laser can be tuned as easily as an ordinary two-mirror single-frequency laser. The relative frequency stability obtained is about
5 \times 10^{8}
per two minutes and
2 \times 10^{9}
per second.