Abstract

We analyze the resonance two-photon interaction of atomic subsystem with broadband squeezed vacuum relative to dipole-forbidden transitions. We suppose that the bandwidth of the squeezed vacuum with carrier frequency ω₀ is assumed to be sufficiently broad 0 < ω ≤ 2ω₀ so that 2ω₀ ≈ ω₂₁ where ω₂₁ is the atomic transition frequency between dipole-forbidden |2〉 and |1〉 states. As the broadband squeezed vacuum consists from the coherent pairs of photons (biphotons) [1] at short times the atomic subsystem undergo the nonlinear nutation in process of two-photon interaction with squeezed light, like one photon cooperative interactions with a single mode coherent field. Here the atomic subsystem inversion oscillates with Rabi frequency 2Ω that is proportionally with product of positive frequency amplitude parts of squeezed EMF strength. Moreover in process of two-photon deexcitation of atomic subsystem the cooperative scattering effect with generation of photons with frequency larger than the bandwidth of the squeezed vacuum ω_k2 ⁼ 2ω₀ + ω_k1 can predominate.

© 1998 IEEE