Optical metrology

Optical metrology is using light to set the standards that define units of measurement and for other high-precision research. Optical clocks, for example, have the potential to define the unit of time — the second — to a more precise degree than is possible in the atomic clocks used at present.

Latest Research and Reviews

News and Comment

  • News and Views |

    Optical clocks held at slightly different heights provide a stringent test of general relativity comparable to space experiments and open new opportunities for clock-based geophysical sensing.

    • Kai Bongs
    •  & Yeshpal Singh
    Nature Photonics 14, 408-409
  • Comments and Opinion |

    The tool of choice to measure optical frequencies with extremely high precision is the optical frequency comb. Camille-Sophie Brès explains what makes this technique so powerful.

    • Camille-Sophie Brès
    Nature Physics 16, 600
  • News and Views |

    Two articles in Nature Photonics demonstrate how Einstein–Podolsky–Rosen entanglement can reduce quantum noise in gravitational-wave interferometers.

    • Pierre-François Cohadon
    Nature Photonics 14, 202-204
  • Editorial |

    Frequency combs measure optical frequencies with an unprecedented precision, allowing myriad applications in optical metrology, high-precision spectroscopy, optical atomic clocks, attosecond science, astronomy and, recently, quantum information processing.