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Quantum Electronics

Temporal evolution of a coherent stimulated radiation pulse in the three-level system in a Pr3+: LaF3crystal

A. I. Agafonov, Grigorii G Grigoryan, Nikolay V Znamenskiy, Eduard A. Manykin, Yurii V Orlov, Evgenii A Petrenko, Andrei Yu Shashkov

Published Sep 30, 2004• 10 citations
Publisher

Abstract

The temporal characteristics of coherent stimulated radiation at the 3 P 0 — 3 H 6 transition in the Pr 3+ ion in a LaF 3 matrix are studied by tuning the pump frequency in the vicinity of the 3 H 4 — 3 P 0 transition. It is found that in the case of the exact tuning to the resonance, a laser pulse, consisting of a train of picosecond spikes of total duration about 10 ns, was delayed by 3–4 ns with respect to the pump pulse onset. As the pump pulse detuning was increased, the shape of the coherent laser pulse changes and its delay increased up to 10 ns. The experimental results are interpreted theoretically.

DOI
10.1070/qe2004v034n09abeh002881

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The temporal characteristics of coherent stimulated radiation at the 3 P 0 — 3 H 6 transition in the Pr 3+ ion in a LaF 3 matrix are studied by tuning the pump frequency in the vicinity of the 3 H 4 — 3 P 0 transition. It is found that in the case of the exact tuning to the resonance, a laser pulse, consisting of a train of picosecond spikes of total duration about 10 ns, was delayed by 3–4 ns with respect to the pump pulse onset. As the pump pulse detuning was increased, the shape of the coherent laser pulse changes and its delay increased up to 10 ns. The experimental results are interpreted theoretically.
The paper reports the experimental results on the temporal characteristics of coherent stimulated emission on the 3P0-3H6 transition of Pr3+ ion dopped into the LaF3 matrix while tuning of pumping frequency in the vicinity of the 3H4-3P0 transition. The generation pulse duration was found to be about 10 ns, and it was delayed by 3-4 ns relative to the beginning of the pumping pulse at the exact resonance. It was observed that as the detuning increased, the shape of the coherent stimulated emission pulse changed and its delay increased up to 10ns. A theoretical interpretation of the experimental results observed is proposed.
The paper presents the experimental results on temporal characteristics of coherent stimulated emission on the 3PO-3H6 transition of Pr3+ doped into the LaF3 matrix while turning the pumping frequency in the vicinity of 3H4-3PO transition. The stimulated emission was generated in the modes both with and without an external resonator. It was found that the emission duration could be up to 2 μs and consisted of train of spikes. Simultaneously the fluorescence emission was observed on the 3PO-3H4, 3H5j, 3H6, 3F2 transitions Pr3+, which also had a complicated temporal form.
We report the results of detailed investigation of optical superradiance (SR) in LaF3:Pr3+ crystal resonantly excited on the 3P0-3H4(0) transition by laser pulse. When the power of the pumping pulse was higher than a certain threshold, the resonant medium emitted by optical SR pulse on 3P0-3H4(0) transition in the direction of the pumping pulse (as well as in the opposite direction) delayed in time with respect to the pumping pulse. Further increasing of the peak power of the pumping pulse led to the observation of SR on the 3P0-3H6(1) transition also. Thus, the two-color SR in the employed crystal was observed.
The effect of temporal coherent control on the two-photon-resonant third-harmonic generation and multiphoton ionization into the continuum states of an atomic system is experimentally and theoretically investigated by means of a pair of partially incoherent, identical laser pulses. The evidence of quantum interference as a function of the delay between the pulses is reported. The transition from the resonant to the nonresonant case is also shown. The obtained results agree with the prediction of a theoretical model showing that the onset of quantum interference appears to be related to the coherence time of the laser radiation, which is much shorter than the pulse duration.
A model is presented for the dynamical evolution of superfluorescence from an optically pumped three-level system. The full propagation, transverse, and diffraction effects are taken into account. With the use of a previously developed algorithm, a computational simulation was constructed from this model and results are presented and discussed. In particular, it is shown that the injected coherent pump-pulse initial characteristics, such as on-axis area, temporal and radial width and shape, can have significant deterministic effects on the superfluorescent pulse delay time, peak intensity, temporal width, and shape. Thus, by specifying certain initial properties of the injected pump pulse, the superfluorescent pulse can be shaped and altered. The results predict the conditions under which an injected light pulse of a given frequency can be used to generate, shape, and control a second light pulse of a different frequency via a nonlinear medium, thus demonstrating a new aspect of the phenomenon of light control by light.