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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Polarization behaviour of optical superradiance in LaF3: Pr3+ crystal

Alexander A. Kalinkin, Alexei A. Kalachev, Самарцев Виталий Владимирович

Published Nov 18, 2003• 0 citations
Publisher

Abstract

The polarization properties of optical two-color superradiance in LaF3:Pr3+ crystal are investigated theoretically. The triggering regime of excitation is considered. Optimal conditions for experimental observation of SR signals are determined.
DOI
10.1117/12.525175

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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 paper describes experimental investigations of two-color optical super-radiance (SR) in LaF3:Pr3+ crystal. Optical excitation was made on the transition 3P0- 3H4(0) at liquid helium temperature. When the power of the pumping 10ns-pulse was higher than a certain threshold, the resonant medium emitted an optical SR pulse on 3P0-3H4(0) transition with a duration of 8-10 ns in the direction of the pumping pulse delayed in time by 12-15 ns with respect to the pumping pulse. When the peak power of the pumping pulse increases up to 40 kW, an SR pulse was also observed for the 3P0-3H6(1) transition. The delay time of this pulse was about 30 ns. Thus, the two-color SR in the employed crystal was observed.
Experimental data concerning superradiant emission from the LaF 3 medium doped with impurity praseodymium ions are presented in the cases of a free medium and when the medium is placed into an optical resonator. The spike structure of superradiance is registered and studied. When the medium is placed inside a cavity, a new channel of energy removal by superradiance related to the cavity mode appears; the old noncavity channels are preserved. The duration of superradiance in the cavity channel is decreased, and regular modulation arises. These peculiarities of superradiance induced by the presence of an optical resonator are explained.
We excite the (4f2)1s0 state directly through a two photon excited state absorption (from the 1D2 level) and indirectly through excitation of the 4f5d band (using an ArF excimer laser). In Pr3+:LaF3 the 1S0 state lies below the band, and only 1S0 emission is observed. In most hosts examined, it is above the band, and only 4f5d emission is observed. In Pr3+:CaF2 there are sites with each of these properties, and both 1S0 and 4f5d emission are observed, with a relative strength that is concentration dependent.