Patent ID: 11881682
Assignee: TOPTICA PHOTONICS AG
Field: Optics (Instruments)
Classification: CPC G  H | IPC H

Claim 13:
14. A system comprising
an optical resonator,
at least one actuator, which is configured to change an optical path length of the resonator,
a modulation-signal generator, which is configured to generate a periodic modulation signal,
an error-signal detector, which is configured to derive an error signal from a light field circulating in the resonator, wherein the error signal indicates a deviation of an optical frequency of the light field from an intended resonant frequency predetermined by said periodic modulation signal,
a controller, which is configured to derive a first actuating signal from said error signal,
a feed-forward control apparatus, which is configured to generate a second actuating signal, which has actuating-signal components at a plurality of at least two higher harmonics of a fundamental frequency of the modulation signal,
wherein the controller and the feed-forward control apparatus are connected to the actuator, such that a superposition signal made up of the first and the second actuating signal is applied to said actuator.