Frequency-angular structure of four-photon resonance parametric scattering

В. М. Арутюнян, G. G. Adonts, Toros A. Papazian +3 more

B. V. Kryshanovskii

V I Vaĭchaĭtis, M V Ignatavichyus, Vladimir A. Kudryashov +2 more

An analysis was made of four-photon interaction processes under conditions of two-photon resonance excitation of the 3 D sodium level by two-frequency radiation from a single-pulse picosecond YAG:Nd laser with frequency doubling and a KDP optical parametric oscillator. The spatial and frequency spectra of the four-photon parametric scattering (FPPS) were recorded and studied experimentally at various sodium vapor densities (10 15 –10 17 cm −3 ) and also using collinear and noncollinear excitation. It was found that the observed conical structure of the FPPS radiation may be interpreted by an analysis of whether the frequency and spatial phase-matching conditions were satisfied. Dependences of the intensity of the FPPS radiation on the intensity of the exciting radiation, the sodium vapor density, and the detuning of the exciting radiation frequency from the two-photon resonance were obtained.

Anatolii A Afanas'ev, M V Ignatavichyus, B. A. Samson +1 more

A theoretical analysis is made of the frequency, angular, and energy characteristics of four-photon parametric luminescence in sodium vapor under conditions of two-frequency excitation of the 3S–3D transition by ultrashort light pulses undergoing coherent interaction. The frequency and angular ranges of the efficient scattering were determined for various excitation geometries of the medium. A comparison was made between the theoretical results and the experimental data obtained previously.

Iu. M. Kirin, Sergey G. Rautian, Vladimir P. Safonov +1 more

Evgeny N. Bodunov, A. P. Bobrovskii