Frequency tunable superflash based on an electromagnetically induced transparency (EIT)
Document Type
Article
Publication Date
7-18-2022
Abstract
We present a new controllable superflash, a maximum transient peak at the falling edge of a square pulse, using a three-level electromagnetically induced transparency (EIT). The superflash in a two-level system occurs at a certain value of the detuning of the probe laser (Delta(peak)) when the optical depth (OD) of the medium is sufficiently large and constant. Here, we show the external tunability of the Delta(peak )for obtaining the maximum transient peak by introducing a three-level EIT. Owing to the EIT dispersion properties, we effectively tune the phase of the forward-scattered light (E-s) by externally controlling the EIT coupling light intensities associated with the Rabi frequency (Omega(c)). When the incident light is turned off, the total transmitted field (E-t) experiences an out-of-phase shift, producing a peak intensity that is three times higher than the input. We observe that this new class of superflash (Type II) occurs near the Err window and exhibits inverse-linearity of the OD, which is in contrast with the characteristics of the previously reported two-level superflash (Type I). Furthermore, we find the quadratic nature of tunability in Delta(peak)(Omega(c)).The new tunability of the superflash by the Rabi frequency may facilitate more rapid and effective control of the superflash compared to a passive optical medium. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
Keywords
Optical precursors
Divisions
PHYSICS
Funders
National Research Foundation of Korea (Grant No: NRF-2019K1A3A1A14064815 & NRF-2020R1I1A3071811),Universiti Malaya (Grant No: IIRG001A-19FNW),National Research Foundation of Korea (Grant No: 2019K1A3A1A14064815)
Publication Title
Optics Express
Volume
30
Issue
15
Publisher
Optica Publishing Group
Publisher Location
2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA