title: Enhancing the macroscopic yield of narrow-band high-order harmonic generation by Fano resonances.
abstract: Resonances in the photoabsorption spectrum of the generating medium can modify the spectrum of high-order harmonics. In particular, window-type Fano resonances can reduce photoabsorption within a narrow spectral region and, consequently, lead to an enhanced emission of high-order harmonics in absorption-limited generation conditions. For high harmonic generation in argon it is shown that the 3s3p(6)np(1)P(1) window resonances (n = 4, 5, 6) give rise to enhanced photon yield. In particular, the 3s3p(6)4p(1)P(1) resonance at 26.6 eV allows a relative enhancement up to a factor of 30 in a 100 meV bandwidth compared to the characteristic photon emission of the neighboring harmonic order. This enhanced, spectrally isolated, and coherent photon emission line has a relative energy bandwidth of only ΔE/E = 3 × 10(-3). Therefore, it might be very useful for applications such as precision spectroscopy or coherent diffractive imaging. The presented mechanism can be employed for tailoring and controlling the high harmonic emission of manifold target materials.
authors: Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Albert-Einstein-Strasse 15, 07745 Jena, Germany and Helmholtz-Institute Jena, Fröbelstieg 3, 07743 Jena, Germany.
authors: Jan
authors: J
authors: Rothhardt
authors: Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Albert-Einstein-Strasse 15, 07745 Jena, Germany.
authors: Steffen
authors: S
authors: Hädrich
authors: Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Albert-Einstein-Strasse 15, 07745 Jena, Germany.
authors: Stefan
authors: S
authors: Demmler
authors: Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Albert-Einstein-Strasse 15, 07745 Jena, Germany.
authors: Manuel
authors: M
authors: Krebs
authors: Helmholtz-Institute Jena, Fröbelstieg 3, 07743 Jena, Germany and Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, 07743 Jena, Germany.
authors: Stephan
authors: S
authors: Fritzsche
authors: Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Albert-Einstein-Strasse 15, 07745 Jena, Germany and Helmholtz-Institute Jena, Fröbelstieg 3, 07743 Jena, Germany.
authors: Jens
authors: J
authors: Limpert
authors: Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Albert-Einstein-Strasse 15, 07745 Jena, Germany and Helmholtz-Institute Jena, Fröbelstieg 3, 07743 Jena, Germany and Fraunhofer Institute of Applied Optics and Precision Engineering, Albert-Einstein-Strasse 7, 07745 Jena, Germany.
authors: Andreas
authors: A
authors: Tünnermann