ElecSus: A program to calculate the electric susceptibility of an atomic ensemble

Abstract

We present a computer program and underlying model to calculate the electric susceptibility of a gas, which is essential to predict its absorptive and dispersive properties. Our program focusses on alkali-metal vapours where we use a matrix representation of the atomic Hamiltonian in the completely uncoupled basis in order to calculate transition frequencies and strengths. The program calculates various spectra for a weak-probe laser beam in an atomic medium with an applied axial magnetic field. This allows many optical devices to be designed, such as Faraday rotators/filters, optical isolators and circular polarisation filters. Fitting routines are also provided with the program which allows the user to perform optical metrology by fitting to experimental data.

16 pages, 9 Figures

References in corpus (13)

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Cited by in corpus (10)

• Atomic Faraday filter with equivalent noise bandwidth less than 1 GHz
• 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
• The Hilbert transform: Applications to atomic spectra
• Complete hyperfine Paschen-Back regime at relatively small magnetic fields realized in Potassium nano-cell
• An atomic Faraday beam splitter for light generated from pump degenerate four-wave mixing in a hollow-core photonic crystal fiber
• The Software Atom
• Sidebands suppression of 852 nm Cesium Faraday anomalous dispersion optical filter by argon gas
• Terahertz-driven phase transition applied as a room-temperature terahertz detector
• Delay and polarization routing of single photons