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Optics Letters

Optics Letters


  • Editor: Anthony J. Campillo
  • Vol. 32, Iss. 11 — Jun. 1, 2007
  • pp: 1381–1383

Reducing the first-order Doppler shift in a Sagnac interferometer

S. Hannemann, E. J. Salumbides, and W. Ubachs  »View Author Affiliations

Optics Letters, Vol. 32, Issue 11, pp. 1381-1383 (2007)

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We demonstrate a technique to reduce first-order Doppler shifts in crossed atomic/molecular and laser beam setups by aligning two counterpropagating laser beams as part of a Sagnac interferometer. Interference fringes on the exit port of the interferometer reveal minute deviations from perfect antiparallelism. Residual Doppler shifts of this method scale with the ratio v ( 4 d ) of the typical atomic/molecular velocity v and the laser beam diameter d. The method is implemented for precision frequency calibration studies at deep-UV wavelengths, both in one- and two-photon excitation schemes: the 6 s 2 6 s 30 p 3 2 J = 1 line in Yb at 199 nm and the 4 p 6 4 p 5 p [ 1 2 ] 0 transition in Kr at λ = 212 nm . The achieved precision of 6 × 10 10 is limited by the characteristics of the laser system.

© 2007 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(300.6360) Spectroscopy : Spectroscopy, laser

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: December 18, 2006
Manuscript Accepted: January 16, 2007
Published: April 25, 2007

S. Hannemann, E. J. Salumbides, and W. Ubachs, "Reducing the first-order Doppler shift in a Sagnac interferometer," Opt. Lett. 32, 1381-1383 (2007)

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