Abstract
Energy transfer between Cr 3+ and Nd 3+ ions in Ca 3Ga 2Ge 4O 14 (CGG) and La 3Ga 2SiO 14 (LGS) crystals has been investigated in the 4.2–300 K temperature range by using steady-state and site-selective time-resolved laser spectrometry. The transfer efficiency was calculated as a function of temperature by using the Cr 3+ lifetimes of the single doped and co-doped samples. Laser experiments were carried out in a diffusive cavity by pumping the co-doped rods of CGG and LGS crystals 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 by considering the influence of the crystal field disorder on the spectral properties of Nd 3+ ions.
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