---
_id: '14012'
abstract:
- lang: eng
  text: Monochromatization of high-harmonic sources has opened fascinating perspectives
    regarding time-resolved photoemission from all phases of matter. Such studies
    have invariably involved the use of spectral filters or spectrally dispersive
    optical components that are inherently lossy and technically complex. Here we
    present a new technique for the spectral selection of near-threshold harmonics
    and their spatial separation from the driving beams without any optical elements.
    We discover the existence of a narrow phase-matching gate resulting from the combination
    of the non-collinear generation geometry in an extended medium, atomic resonances
    and absorption. Our technique offers a filter contrast of up to 104 for the selected
    harmonics against the adjacent ones and offers multiple temporally synchronized
    beamlets in a single unified scheme. We demonstrate the selective generation of
    133, 80 or 56 nm femtosecond pulses from a 400-nm driver, which is specific to
    the target gas. These results open new pathways towards phase-sensitive multi-pulse
    spectroscopy in the vacuum- and extreme-ultraviolet, and frequency-selective output
    coupling from enhancement cavities.
article_processing_charge: No
article_type: original
author:
- first_name: Rajendran
  full_name: Rajeev, Rajendran
  last_name: Rajeev
- first_name: Johannes
  full_name: Hellwagner, Johannes
  last_name: Hellwagner
- first_name: Anne
  full_name: Schumacher, Anne
  last_name: Schumacher
- first_name: Inga
  full_name: Jordan, Inga
  last_name: Jordan
- first_name: Martin
  full_name: Huppert, Martin
  last_name: Huppert
- first_name: Andres
  full_name: Tehlar, Andres
  last_name: Tehlar
- first_name: Bhargava Ram
  full_name: Niraghatam, Bhargava Ram
  last_name: Niraghatam
- first_name: Denitsa Rangelova
  full_name: Baykusheva, Denitsa Rangelova
  id: 71b4d059-2a03-11ee-914d-dfa3beed6530
  last_name: Baykusheva
- first_name: 'Nan'
  full_name: Lin, Nan
  last_name: Lin
- first_name: Aaron
  full_name: von Conta, Aaron
  last_name: von Conta
- first_name: Hans Jakob
  full_name: Wörner, Hans Jakob
  last_name: Wörner
citation:
  ama: 'Rajeev R, Hellwagner J, Schumacher A, et al. In situ frequency gating and
    beam splitting of vacuum- and extreme-ultraviolet pulses. <i>Light: Science &#38;
    Applications</i>. 2016;5(11):e16170-e16170. doi:<a href="https://doi.org/10.1038/lsa.2016.170">10.1038/lsa.2016.170</a>'
  apa: 'Rajeev, R., Hellwagner, J., Schumacher, A., Jordan, I., Huppert, M., Tehlar,
    A., … Wörner, H. J. (2016). In situ frequency gating and beam splitting of vacuum-
    and extreme-ultraviolet pulses. <i>Light: Science &#38; Applications</i>. Springer
    Nature. <a href="https://doi.org/10.1038/lsa.2016.170">https://doi.org/10.1038/lsa.2016.170</a>'
  chicago: 'Rajeev, Rajendran, Johannes Hellwagner, Anne Schumacher, Inga Jordan,
    Martin Huppert, Andres Tehlar, Bhargava Ram Niraghatam, et al. “In Situ Frequency
    Gating and Beam Splitting of Vacuum- and Extreme-Ultraviolet Pulses.” <i>Light:
    Science &#38; Applications</i>. Springer Nature, 2016. <a href="https://doi.org/10.1038/lsa.2016.170">https://doi.org/10.1038/lsa.2016.170</a>.'
  ieee: 'R. Rajeev <i>et al.</i>, “In situ frequency gating and beam splitting of
    vacuum- and extreme-ultraviolet pulses,” <i>Light: Science &#38; Applications</i>,
    vol. 5, no. 11. Springer Nature, pp. e16170–e16170, 2016.'
  ista: 'Rajeev R, Hellwagner J, Schumacher A, Jordan I, Huppert M, Tehlar A, Niraghatam
    BR, Baykusheva DR, Lin N, von Conta A, Wörner HJ. 2016. In situ frequency gating
    and beam splitting of vacuum- and extreme-ultraviolet pulses. Light: Science &#38;
    Applications. 5(11), e16170–e16170.'
  mla: 'Rajeev, Rajendran, et al. “In Situ Frequency Gating and Beam Splitting of
    Vacuum- and Extreme-Ultraviolet Pulses.” <i>Light: Science &#38; Applications</i>,
    vol. 5, no. 11, Springer Nature, 2016, pp. e16170–e16170, doi:<a href="https://doi.org/10.1038/lsa.2016.170">10.1038/lsa.2016.170</a>.'
  short: 'R. Rajeev, J. Hellwagner, A. Schumacher, I. Jordan, M. Huppert, A. Tehlar,
    B.R. Niraghatam, D.R. Baykusheva, N. Lin, A. von Conta, H.J. Wörner, Light: Science
    &#38; Applications 5 (2016) e16170–e16170.'
date_created: 2023-08-10T06:37:25Z
date_published: 2016-11-01T00:00:00Z
date_updated: 2023-08-22T08:46:05Z
day: '01'
doi: 10.1038/lsa.2016.170
extern: '1'
external_id:
  pmid:
  - '30167130'
intvolume: '         5'
issue: '11'
keyword:
- Atomic and Molecular Physics
- and Optics
- Electronic
- Optical and Magnetic Materials
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1038/lsa.2016.170
month: '11'
oa: 1
oa_version: Published Version
page: e16170-e16170
pmid: 1
publication: 'Light: Science & Applications'
publication_identifier:
  eissn:
  - 2047-7538
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: In situ frequency gating and beam splitting of vacuum- and extreme-ultraviolet
  pulses
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 5
year: '2016'
...