The invention relates to a method for operating a pulse laser (10) designed to produce laser pulses having a recurrence frequency (fR) and containing a spectrum of N frequency components fn with fn= n*fR+f0 (n=1-N) (f0: offset frequency), whereby a first control signal for regulating the recurrence frequency is produced by means of a recurrence frequency control circuit, and a second control signal for regulating the offset frequency is produced by means of an offset frequency control circuit. The laser pulses are oriented towards a reference cell (33) whereby an atomic transition can be stimulated and a spectroscopic signal can be induced at a pre-determined recurrence frequency and a pre-determined offset frequency. Said signal can be detected by a detector device (31) by means of which a characteristic output signal for the presence or absence of the spectroscopic signal is produced. The output signal of the detector device (31) is used to produce either the first or the second control signal, and the recurrence frequency or the offset frequency of the pulse laser (10) is regulated in such a way that the output signal of the detector device (31) indicates the occurrence of the spectroscopic signal.
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