Saturation of absorption The 3s 3p resonance line of sodium has a wave- length of =...
Saturation of absorption The 3s 3p resonance line of sodium has a wave- length of = 589 nm. (a) Sodium atoms in a magnetic trap form a spherical cloud of diameter 1 mm. The Doppler shift and the Zeeman effect of the field are both small compared to T. Calculate the number of atoms that gives a transmission of e-l = 0.37 for a weak resonant laser beam. (b) Determine the absorption of a beam with in- tensity I = Isat.