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Title: Bright circularly polarized soft X-ray high harmonics for X-ray magnetic circular dichroism

Abstract

We demonstrate, to our knowledge, the first bright circularly polarized high-harmonic beams in the soft X-ray region of the electromagnetic spectrum, and use them to implement X-ray magnetic circular dichroism measurements in a tabletop-scale setup. Using counterrotating circularly polarized laser fields at 1.3 and 0.79 µm, we generate circularly polarized harmonics with photon energies exceeding 160 eV. The harmonic spectra emerge as a sequence of closely spaced pairs of left and right circularly polarized peaks, with energies determined by conservation of energy and spin angular momentum. We explain the single-atom and macroscopic physics by identifying the dominant electron quantum trajectories and optimal phase-matching conditions. The first advanced phase-matched propagation simulations for circularly polarized harmonics reveal the influence of the finite phase-matching temporal window on the spectrum, as well as the unique polarization-shaped attosecond pulse train. Finally, we use, to our knowledge, the first tabletop X-ray magnetic circular dichroism measurements at the N4,5 absorption edges of Gd to validate the high degree of circularity, brightness, and stability of this light source. These results demonstrate the feasibility of manipulating the polarization, spectrum, and temporal shape of high harmonics in the soft X-ray region by manipulating the driving laser waveform.

Authors:
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Publication Date:
Research Org.:
Univ. of California, San Diego, CA (United States); Univ. of Colorado, Boulder, CO (United States)
Sponsoring Org.:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF); REA; German Research Foundation (DFG); Swedish Research Council (SRC); Czech Science Foundation
OSTI Identifier:
1235176
Alternate Identifier(s):
OSTI ID: 1348205; OSTI ID: 1682305
Grant/Contract Number:  
SC0001805; SC0003678; PHY-1125844; 328334; FIS2013-44174-P; PHY-1068706; GR 4234/1-1; 281043; 15-08740Y; SC0002002
Resource Type:
Journal Article: Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 112 Journal Issue: 46; Journal ID: ISSN 0027-8424
Publisher:
Proceedings of the National Academy of Sciences
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 36 MATERIALS SCIENCE; X-rays; high harmonics generation; magnetic material; ultrafast light science; phase matching; 74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

Fan, Tingting, Grychtol, Patrik, Knut, Ronny, Hernández-García, Carlos, Hickstein, Daniel D., Zusin, Dmitriy, Gentry, Christian, Dollar, Franklin J., Mancuso, Christopher A., Hogle, Craig W., Kfir, Ofer, Legut, Dominik, Carva, Karel, Ellis, Jennifer L., Dorney, Kevin M., Chen, Cong, Shpyrko, Oleg G., Fullerton, Eric E., Cohen, Oren, Oppeneer, Peter M., Milošević, Dejan B., Becker, Andreas, Jaroń-Becker, Agnieszka A., Popmintchev, Tenio, Murnane, Margaret M., and Kapteyn, Henry C. Bright circularly polarized soft X-ray high harmonics for X-ray magnetic circular dichroism. United States: N. p., 2015. Web. doi:10.1073/pnas.1519666112.
Fan, Tingting, Grychtol, Patrik, Knut, Ronny, Hernández-García, Carlos, Hickstein, Daniel D., Zusin, Dmitriy, Gentry, Christian, Dollar, Franklin J., Mancuso, Christopher A., Hogle, Craig W., Kfir, Ofer, Legut, Dominik, Carva, Karel, Ellis, Jennifer L., Dorney, Kevin M., Chen, Cong, Shpyrko, Oleg G., Fullerton, Eric E., Cohen, Oren, Oppeneer, Peter M., Milošević, Dejan B., Becker, Andreas, Jaroń-Becker, Agnieszka A., Popmintchev, Tenio, Murnane, Margaret M., & Kapteyn, Henry C. Bright circularly polarized soft X-ray high harmonics for X-ray magnetic circular dichroism. United States. https://doi.org/10.1073/pnas.1519666112
Fan, Tingting, Grychtol, Patrik, Knut, Ronny, Hernández-García, Carlos, Hickstein, Daniel D., Zusin, Dmitriy, Gentry, Christian, Dollar, Franklin J., Mancuso, Christopher A., Hogle, Craig W., Kfir, Ofer, Legut, Dominik, Carva, Karel, Ellis, Jennifer L., Dorney, Kevin M., Chen, Cong, Shpyrko, Oleg G., Fullerton, Eric E., Cohen, Oren, Oppeneer, Peter M., Milošević, Dejan B., Becker, Andreas, Jaroń-Becker, Agnieszka A., Popmintchev, Tenio, Murnane, Margaret M., and Kapteyn, Henry C. Tue . "Bright circularly polarized soft X-ray high harmonics for X-ray magnetic circular dichroism". United States. https://doi.org/10.1073/pnas.1519666112.
@article{osti_1235176,
title = {Bright circularly polarized soft X-ray high harmonics for X-ray magnetic circular dichroism},
author = {Fan, Tingting and Grychtol, Patrik and Knut, Ronny and Hernández-García, Carlos and Hickstein, Daniel D. and Zusin, Dmitriy and Gentry, Christian and Dollar, Franklin J. and Mancuso, Christopher A. and Hogle, Craig W. and Kfir, Ofer and Legut, Dominik and Carva, Karel and Ellis, Jennifer L. and Dorney, Kevin M. and Chen, Cong and Shpyrko, Oleg G. and Fullerton, Eric E. and Cohen, Oren and Oppeneer, Peter M. and Milošević, Dejan B. and Becker, Andreas and Jaroń-Becker, Agnieszka A. and Popmintchev, Tenio and Murnane, Margaret M. and Kapteyn, Henry C.},
abstractNote = {We demonstrate, to our knowledge, the first bright circularly polarized high-harmonic beams in the soft X-ray region of the electromagnetic spectrum, and use them to implement X-ray magnetic circular dichroism measurements in a tabletop-scale setup. Using counterrotating circularly polarized laser fields at 1.3 and 0.79 µm, we generate circularly polarized harmonics with photon energies exceeding 160 eV. The harmonic spectra emerge as a sequence of closely spaced pairs of left and right circularly polarized peaks, with energies determined by conservation of energy and spin angular momentum. We explain the single-atom and macroscopic physics by identifying the dominant electron quantum trajectories and optimal phase-matching conditions. The first advanced phase-matched propagation simulations for circularly polarized harmonics reveal the influence of the finite phase-matching temporal window on the spectrum, as well as the unique polarization-shaped attosecond pulse train. Finally, we use, to our knowledge, the first tabletop X-ray magnetic circular dichroism measurements at the N4,5 absorption edges of Gd to validate the high degree of circularity, brightness, and stability of this light source. These results demonstrate the feasibility of manipulating the polarization, spectrum, and temporal shape of high harmonics in the soft X-ray region by manipulating the driving laser waveform.},
doi = {10.1073/pnas.1519666112},
url = {https://www.osti.gov/biblio/1235176}, journal = {Proceedings of the National Academy of Sciences of the United States of America},
issn = {0027-8424},
number = 46,
volume = 112,
place = {United States},
year = {2015},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at https://doi.org/10.1073/pnas.1519666112

Citation Metrics:
Cited by: 65 works
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