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公开(公告)号：US11881682B2
公开(公告)日：2024-01-23
申请号：US17348971
申请日：2021-06-16
Applicant: TOPTICA Photonics AG
Inventor： Martin Enderlein , Manfred Hager , Thomas A. Puppe , Frank Lison
CPC classification number: H01S5/0687 , H01S3/1305 , H01S3/139 , H01S5/0092 , H01S5/0604 , H01S5/14
Abstract: The invention relates to a method for modulating the resonant frequency of an optical resonator (1) in accordance with a periodic, not necessarily harmonic, modulation signal (Umod(t)). Fast modulation of an optical resonator is intended to be made possible in which the current resonant frequency follows the modulation signal (Umod(t)) as precisely as possible, and specifically at a fundamental frequency of the modulation signal in the kHz range. To do this, the invention proposes the following method steps:
deriving an error signal (E(t)) from a light field circulating in the resonator (1), wherein the error signal (E(t)) indicates the deviation of the optical frequency of the light field from a target value,
deriving a first actuating signal (S1(t)) from the error signal (E(t)) by means of a controller (6),
generating a second actuating signal (S2(t)), which has actuating-signal components at one or more harmonics (fmod, 2fmod, . . . ) of the fundamental frequency (fmod) of the modulation signal (Umod(t)), and
applying a superposition signal made up of the first and the second actuating signal (S1(t), S2(t)) to an actuator (3) that changes the optical path length of the resonator (1). In other words, the invention makes use of a combination of control and narrow-band feed-forward control tuned to the spectrum of the modulation signal (Umod(t)) and of the error signal (E(t)) to modulate the resonant frequency. Preferably, the feed-forward control used for generating the second actuating signal (S2(t)) is automatically adapted in accordance with the error signal (E(t)). In addition, the invention relates to an accordingly configured optical system.
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