skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Orientation dependence of temporal and spectral properties of high-order harmonics in solids

Authors:
; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1413821
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review A
Additional Journal Information:
Journal Volume: 96; Journal Issue: 6; Related Information: CHORUS Timestamp: 2017-12-18 10:08:47; Journal ID: ISSN 2469-9926
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Wu, Mengxi, You, Yongsing, Ghimire, Shambhu, Reis, David A., Browne, Dana A., Schafer, Kenneth J., and Gaarde, Mette B. Orientation dependence of temporal and spectral properties of high-order harmonics in solids. United States: N. p., 2017. Web. doi:10.1103/PhysRevA.96.063412.
Wu, Mengxi, You, Yongsing, Ghimire, Shambhu, Reis, David A., Browne, Dana A., Schafer, Kenneth J., & Gaarde, Mette B. Orientation dependence of temporal and spectral properties of high-order harmonics in solids. United States. doi:10.1103/PhysRevA.96.063412.
Wu, Mengxi, You, Yongsing, Ghimire, Shambhu, Reis, David A., Browne, Dana A., Schafer, Kenneth J., and Gaarde, Mette B. 2017. "Orientation dependence of temporal and spectral properties of high-order harmonics in solids". United States. doi:10.1103/PhysRevA.96.063412.
@article{osti_1413821,
title = {Orientation dependence of temporal and spectral properties of high-order harmonics in solids},
author = {Wu, Mengxi and You, Yongsing and Ghimire, Shambhu and Reis, David A. and Browne, Dana A. and Schafer, Kenneth J. and Gaarde, Mette B.},
abstractNote = {},
doi = {10.1103/PhysRevA.96.063412},
journal = {Physical Review A},
number = 6,
volume = 96,
place = {United States},
year = 2017,
month =
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on December 18, 2018
Publisher's Accepted Manuscript

Save / Share:
  • We investigate the connection between crystal symmetry and temporal and spectral properties of high-order harmonics in solids. We calculate the orientation-dependent harmonic spectrum driven by an intense, linearly polarized infrared laser field, using a momentum-space description of the generation process in terms of strong-field-driven electron dynamics on the band structure. We show that the orientation dependence of both the spectral yield and the subcycle time profile of the harmonic radiation can be understood in terms of the coupling strengths and relative curvatures of the valence band and the low-lying conduction bands. In particular, we show that in some systems thismore » gives rise to a rapid shift of a quarter optical cycle in the timing of harmonics in the secondary plateau as the crystal is rotated relative to the laser polarization. Here, we address recent experimental results in MgO and show that the observed change in orientation dependence for the highest harmonics can be interpreted in the momentum space picture in terms of the contributions of several different conduction bands.« less
  • The temporal confinement of high harmonic generation (HHG) via modulation of the polarization of the fundamental pulse is studied in both temporal and spectral domains. In the temporal domain, a collinear cross-correlation setup using a 40 fs IR pump for the HHG and a 9 fs IR pulse to probe the generated emission is used to measure the XUV pulse duration. The observed temporal confinement is found to be consistent with theoretical predictions. An increased confinement is observed when a 9 fs pulse is used to generate the harmonics. An important spectral broadening, including a continuum background, is also measured.more » Theoretical calculations show that with 10 fs driving pulses, either one or two main attosecond pulses are created depending on the value of the carrier envelope phase.« less
  • Ultrafast extreme-ultraviolet pulses are spectrally selected by a time-delay-compensated grating monochromator. The intrinsic very short duration of the pulses is obtained by exploiting the high-order harmonic generation process. The temporal characterization of the harmonic pulses is obtained using a cross-correlation method: pulses as short as 8 fs are measured at the output of the monochromator in the case of the 23rd harmonic. This value is in agreement with the expected duration of such pulses, indicating that the influence of the monochromator is negligible. The photon flux has been measured with a calibrated photodiode, pointing out the good efficiency of themore » monochromator, derived by the exploitation for the two gratings of the conical diffraction mounting.« less
  • Cesium vapor interacting with a tightly focused, intense midinfrared (3.4 {mu}m) source produces high harmonic radiation in the visible/UV spectral range. The measured yields of harmonic orders 9-17 are found to yield good quantitative agreement with numerical simulations that include both the single-atom and the macroscopic response. The 5th-9th harmonic orders are generated with sufficient pulse energies ({approx}100 pJ) for direct temporal measurements using an autocorrelation method and when correlated with bandwidth measurements are found not to be transform limited. A blueshift connected to a strong time-dependent ionization appears to be the cause of this spectral broadening.
  • The polarization of the two beam (driver-probe) high-order harmonic generation from solids is measured. The experiments, together with computer simulations, allow us to distinguish two different coupling mechanisms of the driver and the probe, resulting in different harmonic efficiencies and spectral slopes. We find that in the nonrelativistic regime the coupling is mostly due to the nonlinear plasma density modulation.