P the invention relates to a passive masers. / p & & p & method of control of a passive maser comprising a cavity resonant which contains a medium capable of sending stimulated, which is introduced into the cavity an interrogation signal module in phase, to generate, from a signal levied in the cavity two error signals representative, respectively, of the difference between the carrier frequency of the interrogation signal and the frequency of the emission stimulated and the difference between the frequency of nuclear of the cavity and said carrier frequency, using a single modulation for the two slaving loops and then the signal levied in the cavity has a phase discriminator adapted to permit to separate the two error signals. / p & & p & this maser is particularly well, because of its excellent stability of the frequency, in order to constitute a standard frequency. / p
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