Abstract
Parametric processes are widely used in precision measurements of optical frequencies with uncertainties of 10-11 or less. These experiments use, for instance, like optical second-harmonic generation assuming that the frequency ratio of 1:2 between fundamental and harmonic light is exact at least at the 10-12 level. To our knowledge only two experiments have been performed to determine whether this is true.1,2 They confirmed the ratio with a relative uncertainty or order 10-6. Here we are reporting an experiment, which allowed us to check the validity of the 1:2 ratio with 2·10-13 uncertainty for multiplicative shifts.
© 1994 IEEE
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