Abstract
The recent results on saturated absorption optical interference spectroscopy of calcium are presented. The photon recoil splitting of the Ca 1S0 — 3P1 intercombination line at 657 nm has been fully resolved. Linewidths as narrow as 3 kHz half width half maximum intensity (HWHM) are reported for radiation beams spatially separated by up to 3.5 cm. Second order Doppler is shown to be the present limitation to the accuracy of this technique. Methods are discussed which could lead to an optical wavelength/ frequency standard with an accuracy of better than 10 −14.
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References
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Bergquist, J.C., Barger, R.L., Glaze, D.J. (1979). High Resolution Spectroscopy of Calcium Atoms. In: Walther, H., Rothe, K.W. (eds) Laser Spectroscopy IV. Springer Series in Optical Sciences, vol 21. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-38950-7_14
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DOI: https://doi.org/10.1007/978-3-540-38950-7_14
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