Non-contact control of two-photon absorption

Ayan Ray, Waseem Raja, Md Farooq Mir, Alok Chakrabarti

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


In this experimental work, we address the issue of the control of two-photon absorption in a Doppler broadened medium of 85Rb atoms under the ladder level coupling 5S1/2 → 5P3/2 → 5D3/2. 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 85Rb D2 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.

Original languageEnglish
Pages (from-to)8340-8347
Number of pages8
JournalApplied Optics
Issue number30
StatePublished - 20 Oct 2017
Externally publishedYes


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