To achieve quantum-noise-limited performance, background-limited laser receivers require narrow-band optical filters. We measured and modeled the ultranarrow-band transmission spectrum of a Cs Faraday filter at 852 nm. The transmission spectrum consisted of passbands on either side of the 6 2S1/2–6 2P3/2 hyperfine doublet lines, making a total of four. The passbands may be simple peaks or highly modulated, depending on the operating parameters. We observed peaked passbands of near-unity transmission with a 0.6-GHz bandwidth and modulated bands with features as sharp as 100MHz. Excellent agreement with our calculations at 852 nm allows us to predict confidently a 0.7-GHz transmission band for Cs at 455 nm.
© 1991 Optical Society of America
Original Manuscript: January 28, 1991
Published: June 1, 1991
J. Menders, K. Benson, S. H. Bloom, C. S. Liu, and Eric Korevaar, "Ultranarrow line filtering using a Cs Faraday filter at 852 nm," Opt. Lett. 16, 846-848 (1991)