Abstract

In this experimental work, we address the issue of the control of two-photon absorption in a Doppler broadened medium of ${}^{85}\mathrm{Rb}$ atoms under the ladder level coupling $5{\mathrm{S}}_{1/2}\to 5{\mathrm{P}}_{3/2}\to 5{\mathrm{D}}_{3/2}$. Here, suppression and enhancement of two-photon absorption are executed by applying an auxiliary laser beam, which is not physically propagating in the same line of the pump-probe combination. Instead, the auxiliary beam, which is in resonance with the ${}^{85}\mathrm{Rb}{\mathrm{D}}_2$ transition, is at a finite distance from the line of propagation of the pump-probe combination. The resonant auxiliary beam produces an atomic beam in the vapor cell, and when it reaches the pump-probe path, it creates an asymmetry in the population of ground state hyperfine components. This asymmetry is responsible for controlling two-photon absorption. We present here results obtained by us along with a qualitative explanation of the physical principles behind the control mechanism.

© 2017 Optical Society of America

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