Effect of line broadening on the performance of Faraday filters

Abstract

We show that homogeneous line broadening drastically affects the performance of atomic Faraday filters. We use a computerized optimization algorithm to find the best magnetic field and temperature for Faraday filters with a range of cell lengths. The effect of self-broadening is found to be particularly important for short vapour cells, and for `wing-type' filters. Experimentally we realize a Faraday filter using a micro-fabricated ${}^{87}$Rb vapour cell. By modelling the filter spectrum using the ElecSus program we show that additional homogeneous line broadening due to the background buffer-gas pressure must also be included for an accurate fit.

8 pages, 6 figures

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Cited by in corpus (10)

• ElecSus: Extension to arbitrary geometry magneto-optics
• A single-mode external cavity diode laser using an intra-cavity atomic Faraday filter with short-term linewidth $<400$ kHz and long-term stability of $<1$ MHz
• Four-wave mixing in a non-degenerate four-level diamond configuration in the hyperfine Paschen-Back regime
• Optimized ultra-narrow atomic bandpass filters via magneto-optic rotation in an unconstrained geometry
• Absolute absorption on the potassium D lines:theory and experiment
• Absorption spectroscopy and Stokes polarimetry in a ${}^{87}$Rb vapour in the Voigt geometry with a 1.5 T external magnetic field
• Quantitative optical spectroscopy of ${}^{87}$Rb vapour in the Voigt geometry in DC magnetic fields up to 0.4T
• An atomic Faraday beam splitter for light generated from pump degenerate four-wave mixing in a hollow-core photonic crystal fiber
• Better magneto-optical filters with cascaded vapor cells in the Faraday-Faraday and Faraday-Voigt geometries
• Atomic line versus lens cavity filters: A comparison of their merits