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

Peculiarities of two-color optical superradiance in the LaF 3 :Pr 3+ crystal

Alexei A. Kalachev, Самарцев Виталий Владимирович

Published Apr 20, 2004• 0 citations
Publisher

Abstract

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.

DOI
10.1117/12.562211

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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.
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.
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.
In this paper, we report the first laser-excited optical double-resonance experiments in rare-earth-doped crystals. Infrared upconversion in LaCl3 : Pr3+ and LaF3 : Pr3+ has been achieved by means of a tunable cw dye laser pump. The quantum efficiency of the upconversion process at 2.03 μ in LaCl3 : Pr3+ is 1.2×10−3, which is an improvement of 4×105 over the highest efficiency found previously with incoherent sources. It is shown that an efficiency of 1 can be easily obtained with higher fluxes and improved crystal quality. Direct excitation of the output fluorescence from the 3P0 level is observed in both LaCl3 : Pr3+ and LaF3 : Pr3+ when the dye laser frequency is resonant with the states of the lower-lying 1D2 manifold in the absence of the infrared input. Detailed assignments of the observed double-resonance transitions have been made from wavelength and polarization measurements.