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Journal of Nonlinear Optical Physics & Materials

RADIATIONS AMPLIFICATION AND IMAGE CONVERSION IN STIMULATED FOUR-WAVE PARAMETRIC MIXING IN POTASSIUM VAPOR

M. E. Movsesyan, A. Papoyan, Svetlana Shmavonyan

Published Oct 1, 1992• 6 citations

Abstract

We report the results of experimental investigation of radiations amplification in stimulated four-wave parametric mixing in potassium vapor using two cells holding active medium (generator-amplifier system). Under the two-photon excitation on 4S→6S transition, the gain of parametrically generated violet radiation on 5P→4S transitions is caused by the amplification of infrared radiation on 6S→5P transitions due to optically pumped stimulated emission process. The optimum conditions for seed radiations amplification are found. For these conditions we realized, for the first time, an image conversion from infrared region of spectrum (3.66 µ) to violet (0.4 µ) with quantum efficiency of conversion over 100% (“brightness intensification”).

DOI: 10.1142/s0218199192000388

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We report the results of experimental investigation of radiations amplification in stimulated four-wave parametric mixing in potassium vapor using two cells holding active medium (generator-amplifier system). Under the two-photon excitation on 4S→6S transition, the gain of parametrically generated violet radiation on 5P→4S transitions is caused by the amplification of infrared radiation on 6S→5P transitions due to optically pumped stimulated emission process. The optimum conditions for seed radiations amplification are found. For these conditions we realized, for the first time, an image conversion from infrared region of spectrum (3.66 µ) to violet (0.4 µ) with quantum efficiency of conversion over 100% (“brightness intensification”).

We study the generation of radiation at the 5P3/2‐4S1/2 transition of potassium vapor under excitation of the 4S1/2‐6S1/2 two‐photon resonance. The model consists of the coupled Maxwell‐Bloch equations for a four‐level configuration of Potassium atom including states 4S, 4P, 5P and 6S, which is numerically solved. Previous experimental studies have shown the emission of Parametric Four‐Wave Mixing (PFWM) radiation near the 5P3/2‐4S1/2 transition at low vapor pressures (P<1014 atoms/cm3) which is also shown in the case of the model studied.

The interaction of a laser with potassium atoms is investigated by monitoring the radiation of the 5P-4S transition under the two-photon 4S(1/2)-6S(1/2) excitation. For low number density and laser intensity the observed radiation is parametric axial or conical, depending on the laser detuning from the two-photon resonance, the number density and the laser intensity. With increasing laser intensities and number densities, an additional delayed component is observed corresponding to a two-step four-wave mixing with the participation of internally generated photons. A two-photon quantum interference effect is observed for the total (axial and conical) parametric four-wave mixing emission. A deviation from the proposed model under certain experimental parameters is attributed to a two-step four-wave mixing and the phase mismatch of the parametric processes.

The parametric four-wave mixing (4WM) process responsible for the generation of coherent blue light in alkali vapors is a self-seeded process which starts by population inversion and amplified spontaneous emission (ASE). Lately, attention has been turned toward frequency up- and down-conversion in alkali vapors, using relatively low pump powers with CW diode lasers. In this Letter, we investigate the interplay between ASE and 4WM in rubidium (Rb) vapors by studying the mid-infrared (mid-IR) radiation emitted in the forward direction at 5.23 μm. We show that the ASE can be suppressed by 4WM in the CW regime. Thus, we demonstrate the generation of coherent mid-IR light at 5.23 μm in hot Rb vapors via parametric 4WM.