In this paper, we present a detailed account of the first precision Ramseycomb spectroscopy in the deep UV. We excite krypton in an atomic beam using pairs of frequency-comb laser pulses that have been amplified to the millijoule level and upconverted through frequency doubling in BBO crystals. The resulting phasecoherent deep-UV pulses at 212.55 nm are used in the Ramsey-comb method to excite the two-photon 4p6 → 4p55p[1/2]0 transition. For the 84Kr isotope, we find a transition frequency of 2829833101679(103) kHz. The fractional accuracy of 3.7 × 10-11 is 34 times better than previous measurements, and also the isotope shifts are measured with improved accuracy. This demonstration shows the potential of Ramsey-comb excitation for precision spectroscopy at short wavelengths.
|Title of host publication||Exploring the World with the Laser|
|Subtitle of host publication||Dedicated to Theodor Hänsch on his 75th Birthday|
|Publisher||Springer International Publishing Switzerland|
|Number of pages||18|
|Publication status||Published - Jan 2018|