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Dipole forces can form periodic structures of atoms inside optical standing waves on the micron length scale. Quantized motion and spatial order of atoms in such optical crystals can be experimentally studied by probe transmission spectroscopy. Our experiment allows direct comparisons of 2D and 3D field geometries. In particular, in the 3D case a sub-kHz Rayleigh resonance is observed. Optical crystals...
A suitable femtosecond (fs) laser system can provide a broad band comb of stable optical frequencies and thus can serve as an rf/optical coherent link. In this way we have performed a direct comparison of the 1S—2S transition in atomic hydrogen at 121 nm with a cesium fountain clock, built at the LPTF/Paris, to reach an accuracy of 1.9×10-14. The same comb-line counting technique was exploited to...
The new alliance between the time and frequency domains in laser spectroscopy has made it possible to develop ultrafast counting schemes that can keep track of single optical oscillations. With this, counting optical oscillations of more than 1015 cycles in one second has become a simple task. High-resolution spectroscopy for basic research as well as metrology greatly benefits from this...
The new alliance between the time and frequency domains in laser spectroscopy has made it possible to develop ultrafast counting schemes that can keep track of single optical oscillations. With this, counting optical oscillations of more than 1015 cycles in one second has become a simple task. High-resolution spectroscopy for basic research as well as metrology greatly benefits from this technology...
We report on the status of the optical link project between PTB and MPQ and present the to our knowledge first frequency transfer using urban fiber networks over a distance of about 500 km length.
The development of high finesse resonators for broadband frequency combs enabled the extension of the versatile frequency comb technique into the extreme ultraviolet with all its implications. We describe new developments in this field
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