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Optical pump–probe processes in Nd 3 + -doped K Pb 2 Br 5 , Rb Pb 2 Br 5 , and K Pb 2 Cl 5

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Abstract

Recently, laser activity has been achieved in the low-phonon-energy, moisture-resistant bromide host crystals: neodymium-doped potassium lead bromide (Nd3+:KPb2Br5) and rubidium lead bromide (Nd3+:RbPb2Br5). Laser activity at 1.07μm was observed for both crystalline materials. Laser operation at the new wavelengths of 1.18 and 0.97μm resulting from the F524+H922IJ4 transitions (J=132 and 112) in Nd:RbPb2Br5 was achieved for the first time in a solid-state laser material. We present cw pump–probe spectra and discuss excited-state absorption and reabsorption processes due to the long-lived lower laser levels, as well as possible depopulation mechanisms feasible for more efficient laser operation in these crystals. The bromides are compared with potassium lead chloride (Nd3+:KPb2Cl5).

© 2005 Optical Society of America

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