Importance

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Abstract

The invention concerns the generation of synthetic light wavelengths in which light from a first light source (D.sub.1) is coupled into a common light path section (L.sub.G1) and its average frequency value (.nu..sub.1) is locked with a resonant frequency (.nu..sub.1) of the Fabry-Perot resonator (R). The light from a second light source (D.sub.2) is coupled into the common light path section (L.sub.G1) and its average frequency value (.nu..sub.2) is set in order to reach a subsequent resonant frequency (.nu..sub.2) of the Fabry-Perot resonator (R) and be locked therewith. A beat frequency (.DELTA..nu..sub.12), which is measured by electronic counters whilst a corresponding measured frequency value (f.sub.12) is prepared, is formed between the frequencies (.nu..sub.1, .nu..sub.2) of the light from the two light sources (D.sub.1, D.sub.2). The light from at least one further light source (D.sub.i) is coupled into the common light path section (L.sub.G1) and its average frequency value (.nu..sub.i) is first adapted to the average frequency value (.nu..sub.1 or .nu..sub.2) of one of the above light sources (D.sub.1, D.sub.2) and then altered until it reaches a pre-determined resonance of the Fabry-Perot resonator (R) and is locked therewith, the number (k.sub.1) of resonances passed through being counted. The beat frequency (.DELTA..nu..sub.1i or .DELTA..nu..sub.2i) between the frequency (.nu..sub.1 or .nu..sub.2) of the light from the selected light source (D.sub.1 or D.sub.2) and from the further light source (D.sub.i) is calculated as the product (k.sub.1 .times..DELTA..nu..sub.12 or k.sub.1 +1.times..DELTA..nu..sub.12) of the beat frequency (.DELTA..nu..sub.12) between the frequencies (.nu..sub.1, .nu..sub.2) of the light from the first and second light sources (D.sub.1, D.sub.2) and the number (k.sub.i or k.sub.1 +1) of resonances passed through.

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First Claim