Abstract

We demonstrate a Faraday anomalous dispersion optical filter (FADOF) operating on ${5\mathrm{S}}_{1/2}–{6\mathrm{P}}_{3/2}$ transition at 420 nm with a 5 cm long cell of 96.5% enriched ${}^{87}\mathrm{Rb}$ and measure the transmission as a function of the magnetic field and temperature. The isotope ${}^{87}\mathrm{Rb}$ FADOF achieves a peak transmission of 98% with a bandwidth of 2.5 GHz when the temperature of the isotope ${}^{87}\mathrm{Rb}$ cell is 280°C and the magnetic field is 500 G. The corresponding equivalent noise bandwidth is 5.9 GHz. The isotope ${}^{87}\mathrm{Rb}$ FADOF is applied to submarine communications, is used as the laser frequency stabilization for some atomic lines, and is also used as the pump laser in four-level Rb active optical clock.

© 2014 Optical Society of America

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