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Ca2Al2SiO7:Eu3+ was prepared by the sol–gel method. Through the emission spectrum of Eu3+ ion, the fluorescence parameters such as Ωi (i=2,4) and radiative transition probabilities of 5D0–7Fj were calculated. The Pb2+ ion with bigger radius has an effect on the fluorescence spectra of Eu3+ which can be explained by the structure of the matrix. Simultaneously, the energy transfers between mercury-like ions (Pb2+ and Bi3+) and Eu3+ ion were observed. The 5D4 and 5D2 energy levels of Eu3+ are the resonance ones for Pb2+ ion. [Copyright &y& Elsevier]

Abstract: This investigation witnesses the fact that the direction of the light-induced self-diffraction spot changes with different Ca2+-doped CSBN ((Ca0.28Ba0.72) x (Sr0.60Ba0.40)1−x Nb2O6) crystals, indicating that the formed noise-grating wave vector direction changes with different ion-doped. Based on the wave optics theory and light-induced self-diffraction under the incident of plane monochromatic light wave in CSBN crystals, the theoretical model of noise-grating is analyzed, constructed and validated in this work. [Copyright &y& Elsevier]

High purity KTiOPO4 (KTP) crystals have been grown using a flux method. The quality, SHG efficiency and damage threshold of KTP crystals grown from high purity reagents were compared with those grown from commercial reagents. Experimental results indicate that KTP crystals using a high purity charge contain less impurities and possess higher SHG efficiency and damage threshold than do crystals grown from commercial reagents. It is proposed that decreasing the concentrations of impurities is an effective way of raising the damage threshold for KTP crystals. [Copyright &y& Elsevier]

By using metal nitrates as starting materials and citric acid as complexing agent, Y3Al5O12 (YAG) and Y3Al5O12:Eu (1 mol%) (YAG:Eu) powder phosphors were prepared by a citrate–gel method. The formation process of YAG and YAG:Eu were investigated by means of XRD, TG–DTA and FT-IR spectra. The purified crystalline phases of YAG and YAG:Eu were obtained at 800 °C. The crystalline YAG:Eu phosphors showed an orange–red emission with 5D0–7F1 (591 nm) as the most prominent group, whose intensity was dependent on the pH value of the starting solution, citric acid content and firing temperature. It has been found that the suitable pH and citric acid/metal ratio are 3 and 2 for obtaining the highest emission intensity, respectively. The emission intensity increases steadily with increasing the annealing temperature from 800 to 1200 °C, and nearly remains constant after 1200 °C. Furthermore, great differences were observed for the lifetimes and the charge transfer band of Eu3+ in crystalline and amorphous states of YAG. [Copyright &y& Elsevier]

Abstract: We have experimentally demonstrated an efficient diode pumped Tm:CLNGG disordered crystal laser operating at 2μm wavelength. The maximum output power of 1.6W was obtained with a slope efficiency as high as 37%. The spectrum of the free-running disordered crystal laser shows a wide emission bandwidth, which will benefit to ultrashort pulse generation by mode locking. Our results suggest that the Tm:CLNGG disordered crystal is a potential laser material for generation of ultrashort pulses at 2μm wavelength. [Copyright &y& Elsevier]