Applied Physics B

, Volume 63, Issue 5, pp 473–480 | Cite as

Frequency locking and unlocking in a femtosecond ring laser with application to intracavity phase measurements

  • S. Diddams
  • B. Atherton
  • J. -C. Diels
Regular Papers


Frequency coupling between the counter-propagating pulses inside a femtosecond ring laser gyroscope is studied. It is shown that frequency lock-in results from the counter-propagating pulses overlapping at or near a scattering surface. Nonetheless, the absence of lock-in with a scatterer at the pulse crossing point is demonstrated for the special case of symmetric scattering. The decoupling of the counter-propagating pulses makes possible the measurement of non-reciprocal phase differences of 10−5 and index differences of 10−10 over 1 cm. Besides measuring rotations, applications are found in the measurement of small changes in the index of refraction, and electrical transients on the 100 fs time scale.


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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • S. Diddams
    • 1
  • B. Atherton
    • 1
  • J. -C. Diels
    • 1
  1. 1.Department of Physics and AstronomyUniversity of New MexicoAlbuquerqueUSA

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