Method for checking the regulation state of a frequency-stabilised laser system and frequency-stabilised laser system

摘要

The invention relates to a method for checking the regulation state of a frequency-stabilised laser system comprising a laser (2). At least one first sidebrand frequency VHF is modulated to the laser beam (1) of said laser, the laser beam being guided through an absorption material (13) comprising a plurality of absorption lines in a detuning region of the laser (2), said absorption lines being arranged at different distances from each other. The laser frequency V_L is detuned and, as a regulation signal for the laser frequency V_L, it is determined whether there has been an absorption in the absorption material. The inventive method is characterised in that a second sidebrand frequency V_FG is modulated to the laser beam (1), said frequency being at a known distance defined by a frequency generator (29) in relation to the laser frequency V_O; in that the absorption of the second sidebrand frequency V_O+V_FG in the absorption material is checked at least from time to time; and in that when no absorption is observed for the second sidebrand frequency, the laser frequency V_L is detuned until an absorption of both the laser frequency VO and the second sidebrand frequency V_O+V_FG is observed.