1a. With an additional control laser of very high intensity applied transverse to the cavity axis, the single-atom EIT condition is achieved and maximum transmission is recovered See Fig.
The application of GRIN rod lens is usually used with its core as optical axis, this is transverse application, and any analyze for vertical application is not seen.
Transverse isotropic model for HTI media with a horizontal symmetry axis is the simplest one used to describe the transverse isotropy of the fractured reservoirs containing parallel vertical cracks.