Electromagnetically induced absorption via spontaneously generated coherence of a Λ system

• Published in: Optics communications Vol. 231; no. 1; pp. 289 - 295
• Main Authors: Liu, Cheng-pu, Gong, Shang-qing, Fan, Xi-jun, Xu, Zhi-zhan
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.02.2004; Elsevier Science
• Subjects: Effects of atomic coherence on propagation, absorption and amplification of light; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation and self-induced transparency; Optics; Physics; Quantum optics; Strong-field excitation of optical transitions in quantum systems; multi-photon processes; dynamic stark shift; 42.50.Gy; 42.50.Hz; 42.50.Md; Pump probe spectrometry; Light coherence; Quantum mechanics; High field effects; Optical transition; Theoretical study; Atomic coherence; Electromagnetic fields; Optical absorption
• ISSN: 0030-4018; 1873-0310
• DOI: 10.1016/j.optcom.2003.12.016

The effect of spontaneously generated coherence (SGC) on the pump–probe response of a nearly degenerate Λ system is investigated by taking into account the dephasing of the low-frequency coherence. It is found, in the case of small dephasing, that instead of electromagnetically induced transparency (EIT) at resonance, electromagnetically induced absorption (EIA) can occur due to the effect of SGC. We also study the effect of relative phase between the two applied fields and find that EIA and EIT can transform mutually by adjusting the relative phase.