Akira Ozawa | Extreme ultraviolet optical frequency combs and applications

▶Title: Extreme ultraviolet optical frequency combs and applications
▶Speaker: Akira Ozawa (MPQ)
▶Abstract: The extreme ultraviolet (XUV) frequency comb is an indispensable tool for extending optical frequency metrology into the unexplored wavelength range below 200 nm. With XUV frequency combs, precision spectroscopy for fundamental physics, optical clocks and laser cooling can be extended into the XUV regime for the first time. Possible applications include the spectroscopy of highly charged ions, nuclear excitation of 229mTh and our planned experiment for the precision spectroscopy of the He+ 1S-2S transition.
The energy levels of hydrogen-like atoms and ions are accurately described by bound-state quantum electrodynamics (QED). The hydrogen-like He+ ion is an interesting spectroscopic target for QED tests. Due to their charge, He+ ions can be held nearly motionless in the field-free environment of a Paul trap, providing ideal conditions for high-precision measurements. The 1S-2S two-photon transition in He+ can be directly excited by an extreme-ultraviolet frequency comb at 60.8 nm generated by a high-power infrared frequency comb using high-order harmonic generation (HHG). A femtosecond enhancement resonator with non-collinear geometry is used for this purpose. The spectroscopic target is a small number of He+ ions trapped in a linear Paul trap and sympathetically cooled by co-trapped Be+ ions. In this talk, I will present the current status of our project towards precision spectroscopy of the 1S-2S two-photon transition in He+. Our recent efforts to realize XUV frequency metrology using a miniaturized compact setup based on XUV waveguides on microchip will also be discussed.

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The Munich Conference on Quantum Science and Technology 2024 (MCQST 2024) brings together the Munich quantum community with international invited guests in academia and industry for three days of talks and poster sessions. Join hundreds of guests from around the world in the beautiful Bavarian Alps on 14-17 May 2024 to exchange ideas, learn about innovative research, and discuss the latest advancements in all fields of quantum science and technology.

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