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Conference on Lasers and Electro-Optics

Stark measurements of potassium excited-state transitions by modulated absorption spectrometry

John P. Hohimer

Published Jan 1, 1983• 0 citations
Publisher
DOI
10.1364/cleo.1983.tum31

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An experimental investigation was made of the broadening of the D lines and of the two-photon absorption line (4S1/2–6S1/2) of potassium vapor subjected to ruby laser radiation. A dye laser beam was used as a probe and this made it possible to record simultaneously all three absorption lines. The measurements were carried out for different polarizations and geometries of the exciting and probe radiations. The observed broadening was attributed to the high-frequency Stark effect in the strong field of the incident wave.
We present a detailed experimental study of the frequency-modulated excitation of a two-level atom, using a microwave field to drive transitions between two Rydberg Stark states of potassium. In the absence of a modulation the interaction is the standard model of the Rabi problem, producing sinusoidal oscillations of the population between the two states. In the presence of a frequency modulation of the interacting field, however, the time evolution of the system is significantly modified, producing square wave oscillations of the population, sinusoidal oscillations at a different frequency, or even sinusoidal oscillations built up in a series of stair steps. The three responses described above are each found in a different regime for the frequency of the modulation with respect to the unmodulated Rabi frequency: the low-, high-, and intermediate-frequency regimes, respectively.
The potassium tunable excited state Stark anomalous dispersion optical filter (SADOF) at 532.33 nm was studied theoretically and experimentally. The theoretical model of SADOF was deduced and the transmission of SADOF was calculated. The transmission spectra of potassium SADOF in different electric fields were measured and the experimental frequency shifts of SADOF versus the strengths of the electric field were given. Furthermore, the comparison between the experimental results with the corresponding theoretically simulated results has been completed. The comparison shows that our experimental results agree with the theoretically simulated results in general.