Low-light-level ladder-type electromagnetically induced transparency and two-photon absorption

Zong Syun He, Jing Yuan Su, Hong Ren Chen, Wei Fu Chen, Meng Huang Sie, Jyun Yan Ye, Chin Chun Tsai

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Ladder-type electromagnetically induced transparency (EIT) and two-photon absorption (TPA) under a low-light level of probe (0.2 μW/cm2 (0.06Γ2)) and weak coupling power for a cesium atom at room temperature are investigated. Reduction of the fluorescence on the TPA in a three-level system via EIT interference is clearly observed and analyzed under the low probe Rabi frequency of about 0.30 MHz to avoid the affects from the vicinity of intermediate hyperfine states. The transparency ratio of EIT derived from the reduction of fluorescence is about 25%. Additionally, the EIT linewidth observed can be as narrow as 2.64 MHz, while the coupling Rabi frequency is around 2.66 MHz. By solving the steady-state optical Bloch equations, the numerical simulation spectra are in good agreement with EIT and TPA. According to our investigations, the Doppler velocity averaging effect over the thermal atoms reducing the linewidth of the EIT signal proves the advantage of observing the EIT in the room-temperature cell.

Original languageEnglish
Pages (from-to)2485-2490
Number of pages6
JournalJournal of the Optical Society of America B: Optical Physics
Volume31
Issue number10
DOIs
Publication statusPublished - 2014 Oct 1

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics

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