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Optics and Spectroscopy

Reflection and refraction of light by a system of interfering atomic states: II. The nonlinear complex refractive index

O. N. Gadomskiĭ, Sergey G. Moiseev

Published Jul 1, 1997• 0 citations
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Optics Express•Apr 26, 2017•7 citations
A method of integrodifferential equations associated with the optical Bloch equations is used to consider the boundary-value problem of nonlinear reflection (refraction) of the laser beams on the superthin film doped by the two-level atoms. An allowance is made for the phase memory effects exhibited by two-level atoms in response to pulses of fields resolved in space and time. A generalized Lorentz-Lorenz formula is derived for a nonlinear complex refractive index of an doped film in the region of an absorption band when this index depends nonlinearly and nonstationarly on the field inside the film. We derived generalized synchronism conditions to investigate the angular distribution of reflected and refracted primary photon echo signals.
We present a theoretical investigation on controlling the transverse shift while most of the researches are on longitudinal Goos-Hänchen shift. A two-layer system is considered. The refractive index of the first layer is fixed. The second layer is an atomic system coupled by a strong laser field to realize the Λ-style electromagnetically induced transparency, and an additional microwave field drives the transition between the lower two levels to construct high refractive index with zero absorption. We use such phenomenon to modify the refractive index, and consequently the transverse shift in reflection. The properties of the atomic system and the transverse shift of reflected field are briefly studied. Our investigation shows that the shift can be tuned by the strength of the microwave field. And since the atomic system is quite sensitive to the phase of the light fields, through which the transverse shift can be manipulated effectively. More importantly, the absorption is limited due to the presence of the microwave field.