FIG. 10.

Alkali polarization as a function of K-Rb density ratio. The solid line shows the density limit for a narrowband pumping laser, using the measured K absorption cross section at 795 nm. The dots are experimental measurements using a broad pumping laser whose maximum polarization is limited by the dichroism effect to 0.92. The dashed line shows expected polarization limits predicted from a naive line-broadening model. From Lancor and Walker (2011).