Optical metrology articles within Nature

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• Article
  06 March 2024 | Open Access

  Near-ultraviolet photon-counting dual-comb spectroscopy

  We demonstrate a photon-counting approach that extends the unique advantages of spectroscopy with interfering frequency combs into regions where nonlinear frequency conversion tends to be very inefficient, providing a step towards precision broadband spectroscopy at short wavelengths and extreme-ultraviolet dual-comb spectroscopy.

  • Bingxin Xu
  • , Zaijun Chen
  •  & Nathalie Picqué

• Article | 28 June 2023

  Frequency–angular resolving LiDAR using chip-scale acousto-optic beam steering

  Three-dimensional imaging using a frequency–angular resolving and frequency-modulated continuous-wave LiDAR enabled by a chip-scale acousto-optic beam-steering device has been demonstrated, with the simplicity and low cost of the device making this a promising technology.

  • Bingzhao Li
  • , Qixuan Lin
  •  & Mo Li

• Article | 21 June 2023

  Quantum-limited optical time transfer for future geosynchronous links

  Laser-based time transfer with near quantum-limited acquisition and timing is demonstrated that can support femtosecond precision over 102 dB link loss, more than sufficient for future time transfer to geosynchronous orbits for future optical clock networks.

  • Emily D. Caldwell
  • , Jean-Daniel Deschenes
  •  & Laura C. Sinclair

• Article
  24 May 2023 | Open Access

  Dynamic optical response of solids following 1-fs-scale photoinjection

  Petahertz-scale optical-field metrology in a pump-probe setting enables the direct observation of how the optical properties of a medium evolve after 1-fs-scale photoinjection.

  • Dmitry A. Zimin
  • , Nicholas Karpowicz
  •  & Vladislav S. Yakovlev

• Article | 05 October 2022

  Free-space dissemination of time and frequency with 10⁻¹⁹ instability over 113 km

  By using 1 W optical frequency combs and nanowatt-level linear optical sampling modules, a time–frequency dissemination over a free-space link of 113 km is achieved with a stability of less than 4 × 10⁻¹⁹ at 10,000 s.

  • Qi Shen
  • , Jian-Yu Guan
  •  & Jian-Wei Pan

• Letter | 11 September 2019

  Energy of the ²²⁹Th nuclear clock transition

  The transition energy of the first excited state of ²²⁹Th to the ground state is determined through the measurement of internal conversion electrons to correspond to a wavelength of 149.7 ± 3.1 nanometres.

  • Benedict Seiferle
  • , Lars von der Wense
  •  & Peter G. Thirolf

• Letter | 19 September 2018

  Absolute timing of the photoelectric effect

  The absolute timing of the photoelectric effect has proved difficult to measure, but the delay between photon arrival at a tungsten surface and ejection of photoelectrons has now been determined.

  • M. Ossiander
  • , J. Riemensberger
  •  & R. Kienberger

• Article | 04 May 2016

  Direct detection of the ²²⁹Th nuclear clock transition

  Direct detection of the ²²⁹Th nuclear clock transition has been achieved, placing direct constraints on transition energy and half-life; these results are a step towards a nuclear clock, nuclear quantum optics and a nuclear laser.

  • Lars von der Wense
  • , Benedict Seiferle
  •  & Peter G. Thirolf

• News & Views | 01 February 2012

  A comb in the extreme ultraviolet

  A 'comb' of photons at evenly spaced frequencies in the extreme ultraviolet has been generated. It will allow a more precise search for variation in the fine-structure constant, which sets the strength of the electromagnetic force. See Letter p.68

  • Linda Young