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AlSi10Mg porous alloy was prepared by selective laser melting (SLM) with a Nd:YAG laser beam, and the compression properties were studied using both experiments and the finite element method (FEM). The results illustrate that the porous alloy undergoes elastic deformation, plastic deformation and densification stage. The joints of the porous alloy are preferentially fractured, and the Si content at the bottom position of the dimple is higher than the dimple edge. During the compression process of the porous AlSi10Mg alloy, the stress and strain distribution at the joint are concentrated, resulting in joint fracture. The inherent elasticity, shear stress and forced contact of supporting plates or chips are the causes of these compression stages. The distribution of Si element in the fracture is caused by the dimples that are easily formed at the a-Al/Si interface, eventually resulting in the Si content at the bottom of the dimple being higher than the dimple edge. [ABSTRACT FROM AUTHOR]

An Nd3+ :Li3Ba2Y3(WO4)8 crystal with dimensions up to 32 × 20 × 14 mm has been grown by the top seed solution growth method. The spectral characterisation of Nd3+ :Li3Ba2Y3(WO4)8 crystal was investigated. The investigated results show that Nd3+ :Li3Ba2Y3(WO4)8 crystal has a broad absorption band with full width at half maximum (FWHM) of ∼9 nm at 805 nm. The absorption cross-sections are 10·12 × 10-20 cm2 for E//Y, 2·33 × 10-20 cm2 for E//X and 3·69 × 10-20 cm2 for E//Z respectively. The emission cross sections are 4·45 × 10-20 cm2 at 1065 nm for E//X, 15·51 × 10-20 cm2 at 1061 nm for E//Y and 6·67 × 10-20 cm2 at 1061 nm for E//Z respectively. The quantum efficiency η is 93·7%. These results suggest that Nd3+ :Li3Ba2Y3(WO4)8 crystal may be regarded as a new high efficiency laser crystal material. [ABSTRACT FROM AUTHOR]

The present paper reports the growth and spectroscopic properties of KYb(WO4)2 crystal. The KYb(WO4)2 crystal with dimensions of 32 × 29 × 12 mm was grown from a mixed flux of K2WO4 and KF by the TSSG method. The spectroscopic properties of KYb(WO4)2 crystals were investigated. The absorption and emission cross-sections of KYb(WO4)2 crystal are 432 × 10-20 cm2 at 981 nm and 369 × 10-20 cm2 at 1024 nm for E//X polarisation respectively. The laser parameters of KYb(WO4)2 crystal were evaluated. These results suggest KYb(WO4)2 crystal as a potential candidate for microchip laser medium. [ABSTRACT FROM AUTHOR]

The Yb3+/Na+:CaMoO4 crystal with dimensions of ø20 × 30 mm3 has been grown by Czochralski method from a flux of Na2MoO4. The absorption and emission spectra of Yb3+/Na+:CaMoO4 crystals were investigated. The absorption bands at 934 nm have a FWHM of 59 nm for π polarisation and 65 nm for σ polarisation respectively. The absorption cross-sections σa are 173 × 10-20 cm2 for π polarisation and 144 × 10-20 cm2 for σ polarisation at 934 nm respectively. The emission bands have a FWHM of 68 nm at 1022 nm for π polarisation and 65 nm at 1023 nm for σ polarisation respectively. The emission cross-sections σe are 114 × 10-20 cm2 at 1022 nm for π polarisation and 127 × 10-20 cm2 at 1023 nm for σ polarisation respectively. The Yb3+/Na+:CaMoO4 crystal may be considered as a potential laser gain material. [ABSTRACT FROM AUTHOR]

This paper reports the thermal properties and 1·064 m m lasing characteristics of Nd3+:LaVO4 crystal pumped with a Ti:sapphire laser. The maximum laser output power is 107 mW at the pumping power of 461 mW. The slope and light conversion efficiency are 52·8 and 22·9% respectively, and the laser threshold is 45 mW. These results indicate that Nd3+:LaVO4 crystal can be regarded as a new laser crystal. [ABSTRACT FROM AUTHOR]