Abstract
Lithium triborate (LB3) has numerous applications in scintillator for neutron detection, laser weapon and communication. LB3 films have been prepared by electron beam evaporation technique under a pressure of 1×10−5mbar on glass substrate at 323K for 4min. The crystallographic orientations and the lattice parameters (a=8.55 (2); b=5.09 (2); c=7.39 (2)Å) were determined by powder XRD indicating the (111) preferential orientation of the film. The lower cut off wavelength at 325nm with 75% transparency was measured from the UV–vis spectrum. The optical constants extinction coefficient (K), reflectance (R), the linear refractive index (1.34) and the optical energy band gap (∼4.0eV) were estimated. The photoluminescence spectrum shows the emission peak in the visible region with low concentration of oxygen defects. LB3 is found to be second harmonic generation (SHG) active using a Q-switched Nd:YAG laser (1064nm, 9ns, 10Hz). The nonlinear refractive index (n2∼10−16cm2/W) and nonlinear absorption coefficient (β∼10−2cm/W) reveal (Z-scan technique) that the material has negative nonlinearity and self-focusing nature.
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