Raman-induced gratings in atomic media
We proposed a new type of electromagnetically induced gratings based on the Raman interaction between a probe (Raman) field and a standing pump field in the three-level atomic system (Fig.4_1). In contrast to electromagnetically induced absorption gratings, our gratings are based on spatial modulation of the Raman gain. We demonstrated that transmission and reflection of a probe Raman field can be simultaneously amplified in the grating (Fig. 4_2). Transmission and reflection spectra can be controlled by varying the pump field intensity. Such structures are of interest for creating all-optical diodes, transistors, and dynamically controlled diffraction gratings and mirrors with amplification.
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Fig. 4_1. Raman gain scheme in the field of a standing pump wave with frequency ω1. ω2 is the probe (Raman) field frequency. |
Fig. 4_2. (a) Transmission and (b) reflection vs Raman detuning Δ20 and pump Rabi frequency Ω1. The pump wave intensity can be within 1-100 mW/cm2 or less. |
- V. G. Arkhipkin, and S. A. Myslivets, Raman-induced gratings in atomic media, Opt. Lett. 39 (11), 3223 (2014).