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Journal of Spectroscopy
Volume 2014, Article ID 541063, 5 pages
http://dx.doi.org/10.1155/2014/541063
Research Article

Velocity Selective Polarization Spectroscopy for Modulation-Free Dispersion Signals at Detuned Frequencies

Korea National University of Education, Chungbuk 363-791, Republic of Korea

Received 23 October 2014; Accepted 8 December 2014; Published 30 December 2014

Academic Editor: Masaki Oura

Copyright © 2014 Hoon Yu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We present a simple technique to obtain modulation-free locking signals at the detuned frequency from an atom transition between hyperfine structures. Polarization spectroscopy allows us to obtain the dispersion signals that are suitable for frequency locking. Velocity selective optical pumping using another laser beam also allows us to obtain signals at the detuned frequency and to shift crossover signal away. By combining these two techniques, we were able to obtain the velocity selective birefringence signal only at the principle transition in an Rb vapor cell and compare the birefringence signal with the theoretical spectrum predicted by using Nakayama’s model.