Note: In situ measurement of vacuum window birefringence by atomic spectroscopy.

@article{Steffen2013NoteIS,
  title={Note: In situ measurement of vacuum window birefringence by atomic spectroscopy.},
  author={Andreas Steffen and Wolfgang Alt and Maximilian Genske and Dieter Meschede and Carsten Robens and Andrea Alberti},
  journal={The Review of scientific instruments},
  year={2013},
  volume={84 12},
  pages={126103}
}
We present an in situ method to measure the birefringence of a single vacuum window by means of microwave spectroscopy on an ensemble of cold atoms. Stress-induced birefringence can cause an ellipticity in the polarization of an initially linearly polarized laser beam. The amount of ellipticity can be reconstructed by measuring the differential vector light shift of an atomic hyperfine transition. Measuring the ellipticity as a function of the linear polarization angle allows us to infer the… CONTINUE READING