Analysis of High Efficiency Electromagnetically Induced Transparency in Potassium Vapor

Abstract

We present a rate-equation theoretical model describing the optical pumping processes on the K D 1 line and we then discuss their influence on the electromagnetically induced transparency resonance parameters. We present also a comparison with the results of an experiment performed in cells containing pure alkali metal or added with a few torrs of buffer gas. The model shows that, in the last case, the complete Maxwellisation of the atomic population velocity distribution, along with the overlapping Doppler profiles of the transitions from the ground-states typical of K, leads to a partial compensation of optical pumping and a significant increase of the amplitude of the electromagnetically induced transparency resonances.

Electromagnetically induced transparency in vacuum and buffer gas potassium cells probed via electro-optic frequency combs

“…We note that the amplitude of the EIT feature in the buffer gas cell is far smaller than observed with the evacuated cell (even after accounting for the difference in cell length) while this observation is in agreement with the observed behavior for Cs [23], it differs from a previous examination of EIT in K using a Hanle configuration [24] which found the buffer gas amplitude to be larger. This enhancement was attributed to optical pumping compensation due to the overlapping Doppler profiles [24].…”

“…This enhancement was attributed to optical pumping compensation due to the overlapping Doppler profiles [24]. …”

Influence of anti-relaxation coating of optical cells on the potassium D1line saturated absorption

“…Such transitions are important due to many applications in fundamental experiments, laser cooling of alkali atoms, development of various sensors like optical clock and magnetometers [1][2][3][4][5][6][7] . The spectrum of potassium is much less studied than those on Na, Rb, and Cs.…”