Abstract

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 6s26s30p32 J=1 line in Yb at 199nm and the 4p64p5p[12]0 transition in Kr at λ=212nm. The achieved precision of 6×1010 is limited by the characteristics of the laser system.

© 2007 Optical Society of America

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