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  • CLEO/Europe and EQEC 2011 Conference Digest
  • OSA Technical Digest (CD) (Optica Publishing Group, 2011),
  • paper CG_P5

XUV to SXR enhancement in HHG with a Quasi-Static Electric Field

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Abstract

High harmonic generation (HHG) is by now a well established technique [1,2] to generate coherent radiation in the extreme ultraviolet (XUV) spectral region. Its main hinderance for widespread applications in e.g. absorption spectroscopy or time-resolved biological imaging is the low photon yield. We propose a technique which increases the photon yield by several orders of magnitude and is applicable over a wide photon energy range. Especially the cutoff region is enhanced by adding a DC electric field periodically in space along the HHG interaction region [3]. The physical mechanism is the disruption of symmetry of the nonlinear microscopic response by altering the resulting driving field in one polarization direction. Tailoring the geometry of the interaction volume, the strength of the driving field and the length of the zones over which the static field is added, the out-of-phase propagating regions can be optimally altered to induce a collective phase-matched conversion process. Figure 1 shows results from 3D calculations [4]. Figure 1(a) shows enhancement at the 100 eV photon energy range as well as for the water window (b). The conventional case for HHG without additional quasistatic field is shown by the black line. Adding the quasistatic field increases the harmonic yield and the amount of increase and spectral position clearly depends on the periodicity for a given and constant field strength. I.e. an optimum choice of field parameters exists for enhancement of a given photon energy via HHG. Figure 1(a) shows enhancement for HHG with a laser pulse linearly polarized with Gaussian temporal and spatial distributions of 5 fs and 40 µm diameter of focus (FWHM), central wavelength of 800 nm and peak intensity at focus 7×1014 W/cm2. This pulse propagates from the focus into the interaction medium (Neon atoms at 20 mbar) producing high-order harmonic enhancement with a photon energy cutoff at approximately 154 eV. Figure 1(b) shows that enhancement is also achievable in the water window spectral region with an appropriate adjustment of pulse peak intensity (3×1015 W/cm2), field parameters (1.12 MV/cm) and period (Δs=32 µm) in doubly ionized Ne at 20 mbar.

© 2011 Optical Society of America

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