How accurate is optical second-harmonic generation?
- 15 May 1995
- journal article
- Published by Optica Publishing Group in Optics Letters
- Vol. 20 (10) , 1095-1097
- https://doi.org/10.1364/ol.20.001095
Abstract
We have checked whether the frequency ratio between fundamental and second-harmonic optical frequencies is exactly 1:2 by measuring the frequency difference between the second harmonics of two diode lasers and comparing it with the frequency difference of the fundamentals. We have improved the 30-year-old experimental limit on the accuracy of the 1:2 frequency ratio by 7 orders of magnitude for frequency-dependent shifts to 2.3 parts in 1013 for a KNbO3 crystal.Keywords
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