macro.interaction_strength

macro.interaction_strength(decay_rate, wavelength, factor=1.0)

Interaction strength per atom, g / 2 pi = sigma_0 gamma / 4, with gamma = Gamma / 2 pi.

The propagation equation is dOmega/dz = 2 i N g rho, so multiplying by the number density N (cm^-3) gives the clerq interaction_strengths entry, in MHz/cm, for a density profile of amplitude 1 (the default). A weak resonant field is then absorbed at N * factor * 3 lambda^2 / (2 pi) per cm in intensity.

Parameters

Name	Type	Description	Default
decay_rate	float	Natural linewidth Gamma / 2 pi, in MHz.	required
wavelength	float	Transition wavelength, in nm.	required
factor	float	Dipole moment squared relative to the cycling transition.	1.0

Returns

Name	Type	Description
	float	g / 2 pi in MHz cm^2.