Cr3+→Nd3+ energy transfer and Nd3+ laser action studies of La3Ga5SiO14:Cr3+,Nd3+ co-doped crystal |
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| Authors: | Azkargorta J Iparraguirre I Balda R Fernandez J |
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| Affiliation: | Dept. de Fisica Aplicada I, Escuela Tecnica Superior de Ingenieros Ind. y de Telecomunicacion, Bilbao; |
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| Abstract: | Energy transfer between Cr3+ and Nd3+ ions has been investigated in the 4.2-300-K temperature range by using steady-state and site-selective time-resolved laser spectroscopy. Radiative and nonradiative energy transfer has been studied from the time-resolved emission spectra and the donor fluorescence decays. The transfer efficiency was calculated as a function of temperature by using the Cr3+ lifetimes of the single doped and co-doped samples. Laser experiments were carried out in a diffusive cavity by pumping a co-doped rod 54 mm long and 5 mm in diameter with xenon flashlamps. The laser spectral emission shows a complex structure which varies as a function of pump energy. The temporal evolution of the laser spectrum is discussed in terms of a simple four-level spectral rate-equation laser model which takes into account the existence of two main broad Nd3+ site distributions with a large spectral overlap |
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