Control device, control system, method for operating a control system

A method for operating a control system, comprising:

• a) operating a first Pound-Drever-Hall system and a second Pound-Drever-Hall system;
• b) coupling a laser module to one of the first Pound-Drever-Hall system or the second Pound-Drever-Hall system;
• c) detecting at least one actual value of a predetermined electrical parameter of the first Pound-Drever-Hall system;
• d) comparing the at least one actual value with a predetermined setpoint value;
• e) decoupling the laser module from the first Pound-Drever-Hall system if a determined deviation between the at least one actual value and setpoint value is greater than a predetermined limit deviation;
• and
• f) coupling the laser module to the second Pound-Drever-Hall system.

A method for carrying out frequency control for a laser module of a control system, the control system comprising at least one laser module for generating laser radiation;

• at least one control device coupled or configured to couple to the at least one laser module and at least one optical resonator coupled or configured to couple to the at least one control device, wherein the at least one control device comprises a semiconductor substrate, a first Pound-Drever-Hall system arranged on the semiconductor substrate and at least one second Pound-Drever-Hall system arranged on the semiconductor substrate;
• the method comprising:
• a) coupling the at least one laser module to the first Pound-Drever-Hall system,
• b) generating laser radiation via the at least one laser module and introducing the laser radiation into the first Pound-Drever-Hall system;
• c) introducing the laser radiation, having a carrier frequency of the laser radiation, into a phase modulator and generating at least one sideband;
• d) splitting the laser radiation into a first partial radiation, having a carrier frequency of the laser radiation, and a second partial radiation, having a potentially phase-shifted carrier frequency of the laser radiation;
• e) superimposing the first partial radiation and the second partial radiation;
• f) monitoring for a predefinable deviation between the first partial radiation and the second partial radiation;
• g) controlling the carrier frequency of the laser radiation if a deviation between the first partial radiation and the second partial radiation that is greater than the predefinable deviation is identified, wherein the carrier frequency is controlled in such a way that it becomes equal to a reference frequency;
• h) decoupling the at least one laser module from the first Pound-Drever-Hall system;
• and
• i) coupling the at least one laser module to the at least one second Pound-Drever-Hall system.