Abstract
We report on a Doppler-free polarization spectroscopy based technique of laser frequency stabilization using a balanced bi-polarimeter set-up. Two linearly polarized weak laser beams are used to probe birefringence induced by two oppositely circularly polarized strong pump beams in a vapour cell. Subtraction of balanced polarimeter signals obtained from the two probe beams results in a background-free dispersion-like reference signal without frequency modulation. The dispersion-like signal corresponding to the closed transition 5 2 S 1/2 (F=2) →5 2 P 3/2 (F′=3) of 87Rb was used for frequency locking of a diode laser. The frequency fluctuations and the drift were measured to be less than 0.25 MHz and 0.02 MHz, respectively, for an observation period of more than 10 hours.
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42.62.Fi; 42.55.Px; 32.30.-r
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Tiwari, V., Singh, S., Mishra, S. et al. Laser frequency stabilization using a balanced bi-polarimeter. Appl. Phys. B 83, 93–96 (2006). https://doi.org/10.1007/s00340-006-2142-0
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DOI: https://doi.org/10.1007/s00340-006-2142-0