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Nd-doped PbClF crystals were grown with modified Bridgman method. Broad and flat emission band at 1.0 μm was observed. The FWHM value of 0.0091 wt.% Nd3+-doped PbClF crystal at 1064 nm reached up to 30 nm with the peak emission cross-section of 1.05×10-19 cm2. All the results indicated that Nd-doped PbClF crystal should be a promising tunable and ultrafast laser material. (© 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [ABSTRACT FROM AUTHOR]

Abstract: The effects of Na+ doping level on the thermal conductivities, absorption and emission spectra, and fluorescence lifetimes of Yb3+,Na+:CaF2 crystals were systematically studied. Sites structure, covalent force, and crystal field strength of Yb3+:CaF2 crystals were markedly varied by codoping Na+ as charge compensator. The 2.0at% Yb3+ and 3.0at% Na+-codoped CaF2 crystal was demonstrated to operate in diode-pumped passively mode-locking scheme. Transform-limited 1ps laser pulses were obtained, showing the crystal capable of producing ultra-short laser pulses. [Copyright &y& Elsevier]