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Journal of Experimental and Theoretical Physics

Observation of a two-frequency resonant hologram from excited sodium atoms

I. S. Grigor’ev, Alexandre F. Semerok, Valerii A Firsov, A. Chankin

Published Sep 1, 1985• 0 citations
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Experimental and theoretical (using a two-level approximation) investigations were made of the properties of resonance holograms (excited-state gratings) created by monochromatic linearly polarized radiation from a cw dye laser in a beam of sodium atoms as a result of the 32P3/2– 32S1/2(F=2) transition. A good qualitative agreement was observed between the theory and experimental results. It was established that the maximum diffraction efficiency was attained when the intensity of the radiation used to form the hologram was of the order of the intensity needed to saturate the transition and the optical thickness of the beam was ~1.1. The sensitivity of the medium was ~1 nJ/cm2 for 1% diffraction efficiency.
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We report the observation of optical amplification in a two-level atomic system driven by a strong, resonant field. By exciting an atomic beam of two-level sodium atoms simultaneously with a strong, fixed-frequency driving field and a weak, tunable, probe field, we have measured the absorption (amplification) line-shape function for several values of driving field strength. In addition, we have verified theoretical predictions that higher amplification is obtained when the strong field is detuned from exact resonance.