Reducing the first-order Doppler shift in a Sagnac interferometer

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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/(4d) 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 6s
Original languageEnglish
Pages (from-to)1381-1383
Number of pages3
JournalOptics Letters
Issue number11
Publication statusPublished - 2007


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