Abstract
Multimillijoule, few-cycle, carrier-envelope-phase (CEP)-locked, near-IR pulses at 750 nm from an optical parametric chirped-pulse amplifier are applied to the generation of CEP-dependent, soft x-ray high harmonics around the boron -edge at 188 eV. The dependence on the CEP manifests the phase coherence of high harmonics preserved in the highest-photon energy ever reported. Multimillijoule optical pulses also allow the extension of the cutoff energy up to 325 eV, exceeding the carbon -edge of the water window. However, in this spectral range, the CEP dependence of harmonic spectra is not observed, suggesting the degradation of temporal coherence due to the heavy ionization of helium atoms.
©2012 Optical Society of America
Full Article | PDF ArticleMore Like This
Jan Rothhardt, Steffen Hädrich, Arno Klenke, Stefan Demmler, Armin Hoffmann, Thomas Gotschall, Tino Eidam, Manuel Krebs, Jens Limpert, and Andreas Tünnermann
Opt. Lett. 39(17) 5224-5227 (2014)
Kyung-Han Hong, Chien-Jen Lai, Jonathas P. Siqueira, Peter Krogen, Jeffrey Moses, Chun-Lin Chang, Gregory J. Stein, Luis E. Zapata, and Franz X. Kärtner
Opt. Lett. 39(11) 3145-3148 (2014)
Stefan Demmler, Jan Rothhardt, Steffen Hädrich, Manuel Krebs, Arvid Hage, Jens Limpert, and Andreas Tünnermann
Opt. Lett. 38(23) 5051-5054 (2013)