High-accuracy deep-UV ramsey-comb spectroscopy in krypton

Sandrine Galtier, Robert K. Altmann*, Laura S. Dreissen, Kjeld S.E. Eikema

*Corresponding author for this work

Research output: Chapter in Book / Report / Conference proceedingChapterAcademicpeer-review


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.

Original languageEnglish
Title of host publicationExploring the World with the Laser
Subtitle of host publicationDedicated to Theodor Hänsch on his 75th Birthday
PublisherSpringer International Publishing Switzerland
Number of pages18
ISBN (Electronic)9783319643465
ISBN (Print)9783319643458
Publication statusPublished - Jan 2018


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