"A technique to eliminate the influence of medium on electromagnetic radiation propagation beam."
"A technology to eliminate the influence of electromagnetic wave propagation in medium" is due to the quantum coherence effect between the excitation channels of atomic light, which leads to the reduction of light absorption at the absorption frequency of atomic vibration and even complete transparency.
Under the action of strong coupling field, the coupling transition produces a pair of modified state transitions, which split the probe field transition into two. The two split probe transitions destructively interfere with absorption through the coherence of modified states, thus inhibiting absorption and making the medium completely transparent under the action of strong coupling field. Another typical model is a three-level system, in which two low-energy levels belong to the ground state, and one of the two electric dipole transitions adopts strong coherent field coupling as the coupling transition. Another transformation uses weak coherent field detection as the detection transformation. In this way, there is a bidirectional excitation channel between the two ground States, which leads to the disappearance of absorption. Under the condition of two-photon vibration, quantum coherence leads to ideal destructive interference between two-way excitation processes, thus producing electromagnetic induction transparency.