Noncollinear Enhancement Cavity for Record-High Out-coupling Efficiency of an Extreme-UV Frequency Comb

We demonstrate a femtosecond enhancement cavity with a crossed-beam geometry for efficient generation and extraction of extreme-ultraviolet (XUV) frequency combs at a 154 MHz repetition rate. We achieve a record-high out-coupled power of 600 μW, directly usable for spectroscopy, at a wavelength of 9...

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Bibliographic Details
Published in:Physical review letters 2020-08, Vol.125 (9), p.1-093902, Article 093902
Main Authors: Zhang, Chuankun, Schoun, Stephen B., Heyl, Christoph M., Porat, Gil, Gaarde, Mette B., Ye, Jun
Format: Article
Language:English
Subjects:
Attosecond pulses
Coupling
Efficiency
Gaussian beams (optics)
Repetition
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Summary:We demonstrate a femtosecond enhancement cavity with a crossed-beam geometry for efficient generation and extraction of extreme-ultraviolet (XUV) frequency combs at a 154 MHz repetition rate. We achieve a record-high out-coupled power of 600 μW, directly usable for spectroscopy, at a wavelength of 97 nm. This corresponds to a >60% out-coupling efficiency. The XUV power scaling and generation efficiency are similar to that achieved with a single Gaussian-mode fundamental beam inside a collinear enhancement cavity. The noncollinear geometry also opens the door for the generation of isolated attosecond pulses at >100 MHz repetition rate.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.125.093902