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Title: High harmonics with spatially varying ellipticity

Journal Article · · Optica
 [1];  [1]; ORCiD logo [2];  [1];  [1]; ORCiD logo [3];  [1];  [4];  [1];  [1];  [5];  [5]; ORCiD logo [1];  [1]
  1. Univ. of Colorado, Boulder, CO (United States). JILA—Dept. of Physics
  2. Univ. of Colorado, Boulder, CO (United States). JILA—Dept. of Physics; National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
  3. Univ. of Salamanca, Salamanca (Spain). Dept. de Fisica Aplicada
  4. National Inst. of Standards and Technology (NIST), Boulder, CO (United States). Electromagnetics Division
  5. Advanced Research Center for Nanolithography (ARCNL), Amsterdam, (Netherlands)

We present a method of producing ultrashort pulses of circularly polarized extreme ultraviolet (EUV) light through high-harmonic generation (HHG). HHG is a powerful tool for generating bright laser-like beams of EUV and soft x-ray light with ultrashort pulse durations, which are important for many spectroscopic and imaging applications in the materials, chemical, and nano sciences. Historically HHG was restricted to linear polarization; however, recent advances are making it possible to precisely control the polarization state of the emitted light simply by adjusting the driving laser beams and geometry. In this work, we gain polarization control by combining two spatially separated and orthogonally linearly polarized HHG sources to produce a far-field beam with a uniform intensity distribution, but with a spatially varying ellipticity that ranges from linearly to fully circularly polarized. This spatially varying ellipticity was characterized using EUV magnetic circular dichroism, which demonstrates that a high degree of circularity is achieved, reaching almost 100% near the magnetic M-edge of cobalt. The spatial modulation of the polarization facilitates measurements of circular dichroism, enabling us to measure spectrally resolved magnetic circular dichroism without the use of an EUV spectrometer, thereby avoiding the associated losses in both flux and spatial resolution, which could enable hyperspectral imaging of chiral systems. Through numerical simulations, we also show the generality of this scheme, which can be applied with either the discrete harmonic orders generated by many-cycle pulses or the high-harmonic supercontinua generated by few-cycle driving laser pulses. Therefore, this technique provides a promising route for the production of bright isolated attosecond pulses with circular polarization that can probe ultrafast spin dynamics in materials.

Research Organization:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-99ER14982; SC0002002
OSTI ID:
1433051
Alternate ID(s):
OSTI ID: 1502464; OSTI ID: 1907885; OSTI ID: 1957812
Journal Information:
Optica, Vol. 5, Issue 4; ISSN 2334-2536
Publisher:
Optical Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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Cited By (7)

Near-circularly polarized isolated attosecond pulse generation from coherent superposition state by a circularly polarized laser field journal May 2019
Controlling the polarization and vortex charge of attosecond high-harmonic beams via simultaneous spin–orbit momentum conservation journal December 2018
Interferometric attosecond lock-in measurement of extreme-ultraviolet circular dichroism journal February 2019
X-ray harmonic generation by orthogonally polarized two-color fields: Spectral shape and polarization journal September 2019
Optical anisotropy of non-perturbative high-order harmonic generation in gapless graphene journal January 2019
Self referencing attosecond interferometer with zeptosecond precision journal January 2019
A self referencing attosecond interferometer with zeptosecond precision text January 2019


Figures / Tables (4)