We demonstrate experimentally the effect of a three-photon electromagnetically induced transparency in hot ⁸⁵Rb atomic vapor driven by two coherent electromagnetic fields. The narrow transparency window is observed on the background of high-contrast Doppler-free subnatural absorption resonance. Our analytical calculations and numerical simulations are in good agreement with the experimental data. Both the transparency and the absorption resonances can find applications in high-precision metrology.
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Zibrov et al. (2002) studied this question.
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