We study the excitation of the quantum coherence in a $\Lambda$-type molecular media and its influence on chirped pulse propagation. The coherent population trapping (CPT) of the ground states in the $\Lambda$-system results in fascinating new dynamics of pulse propagation through it. We have considered the two- and three-level molecules. The dressed state basis approach is employed, which provides deep physical insights showing interaction of “bright” and “dark” states with radiation. The level structure of the model is common for the molecular media, where the ground states maybe the ro-vibrational levels of the ground electronic state. We consider a gas of three-level atoms or molecules in the presence of two coherent optical pulses. We demonstrate the importance of role of the dark states. The presented results are important for applications to manipulation of quantum states for molecular detection in engineering, chemical, and biological applications.
We study Raman scattering in molecular media by applying two laser fields in a two-photon resonance with vibrational transition. The role of rotational levels has been investigated. It is shown that the molecular vibrational coherence strongly depends on the effect of coherent population trapping for rotational levels. The obtained results are important for application of Raman spectroscopy to molecular detection for engineering, chemical, and biological applications.
We consider optomechanical effects that are related to the appearance of an additional optical phase due to the motion of an ultradispersive medium and the rotational Doppler effect for light. We have theoretically shown that the enhanced Fizeau effect on atoms in a cavity can be observed and the change of phase is sensitive to the mechanical motion. These two effects can be applied to the measurement of rotations as small as 10−17 s−1 Hz1/2. It is worth noting here that the measurement of rotation is not related to Sagnac interferometry.
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