Potassium tune-out-wavelength measurement using atom interferometry and a multipass optical cavity

摘要

The longest tune-out wavelength for potassium atoms, λ_(zero) = 768.9701(4) nm, was measured using an atom interferometer with a large irradiance gradient supported in a multipass optical cavity. Systematic errors in λ_(zero) measurements that arise from laser light, Doppler shifts, and the Earth's rotation are described. The ratio of oscillator strengths for the potassium D2 and D1 lines inferred from this λ_(zero) measurement is ρ = f_(D2)/f_(D1) = 2.0066(11), and the ratio of line strengths is R = S_(D2)/S_(D1) = 1.9977(11).