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Opt Express. 2011 Nov 7;19(23):23483-93. doi: 10.1364/OE.19.023483.

Power optimization of XUV frequency combs for spectroscopy applications [Invited].

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JILA, National Institute of Standards and Technology, and University of Colorado Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA.


We address technical impediments to the generation of high-photon flux XUV frequency combs through cavity-enhanced high harmonic generation. These difficulties arise from mirror damage, cavity nonlinearity, the intracavity plasma generated during the HHG process, and imperfect phase-matching. By eliminating or minimizing each of these effects we have developed a system capable of generating > 200 μW and delivering ~20 μW of average power for each spectrally separated harmonic (wavelengths ranging from 50 nm - 120 nm), to actual comb-based spectroscopy experiments.

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