System for determining optical frequencies with light source

摘要

The system has a light source (1) and at least one heterodyne detector (26) for detecting signal formed with the output light of the light source with the frequency components to be determined. The light source transmits an emission line variable in sequence for the superimposition with the measuring light. The absolute frequency transmitter (13) is used with the control of the light source, also with at least one selected absolute frequency an absolute frequency signal (85,88), and with the relative frequency transmitter (16) relative frequency signals (86) are producible. These signals are producible with frequency spaces selected relative to each other. An evaluation unit (32,34,35) is provided, which can determine at least one frequency component (87) of the measuring light from the absolute frequency. The frequency spacing can also be determined using relative frequency signals between the absolute frequency and the at least one frequency component.