Dynamic frequency response of the auto-tuned hydrogen maser to systematic perturbations

This paper discusses the frequency stability of atomic hydrogen masers which use the cavity frequency-switching automatic cavity frequency stabilization system. The theoretical response of the maser output frequency when the cavity frequency is perturbed by systematic perturbations is presented and compared with experimental measurements. A new and improved implementation of the auto-tuner design is also introduced which has promise to significantly improve the long term stability of the hydrogen maser