Beat signal generating device for use in a terahertz system, terahertz system and use of a beat signal generating device

A terahertz system comprising a beat signal generating device, the beat signal generating device comprising

• a first laser for generating radiation of a first wavelength;
• a second laser for generating radiation of a second wavelength different from the first wavelength;
• a first and a second output port;
• a phase modulating unit for modifying both the phase of radiation generated by the first laser and the phase of radiation generated the second laser, wherein the beat signal generating device is configured in such a way that
• the radiation generated by the first laser is transmitted through the second laser and superposed with the radiation generated by the second laser at the second output port, and
• the radiation generated by the second laser is transmitted through the first laser and superposed with the radiation generated by the first laser at the first output port, such that a first beat signal will be emitted at the first output port and a second beat signal will be emitted at the second output port, wherein the phase between the first and the second beat signal can be adjusted by means of the phase modulating unit, wherein
• the first output port of the beat signal generating device is connected to a first component of the Terahertz system and the second output port of the beat signal generating device is connected to a second component of the Terahertz system.

Use of a beat signal generating device, wherein the beat signal generating device comprises

• a first laser for generating radiation of a first wavelength;
• a second laser for generating radiation of a second wavelength different from the first wavelength;
• a first and a second output port;
• a phase modulating unit for modifying both the phase of radiation generated by the first laser and the phase of radiation generated the second laser, wherein the beat signal generating device is configured in such a way that
• the radiation generated by the first laser is transmitted through the second laser and superposed with the radiation generated by the second laser at the second output port, and
• the radiation generated by the second laser is transmitted through the first laser and superposed with the radiation generated by the first laser at the first output port, such that a first beat signal will be emitted at the first output port and a second beat signal will be emitted at the second output port, wherein the phase between the first and the second beat signal can be adjusted by means of the phase modulating unit, wherein
• the beat signal generating device is used to control a Terahertz system, wherein the first output port of the beat signal generating device is connected to a first component of the Terahertz system and the second output port of the beat signal generating device is connected to a second component of the Terahertz system.