title: Low power optical limiting studies of copper doped lithium tetraborate nanoparticles.
abstract: The copper doped lithium tetraborate (LTB:Cu) nanoparticles were synthesized by sol-gel method and characterized by XRD (tetragonal structure) and by FESEM (sphere-like nanoparticle). UV-Vis studies show that there is no strong absorption in the visible region. In the luminescence spectrum, the emission peak at 370 nm reveals the presence of Cu+ in LTB lattice. The relative powder second harmonic generation efficiency of pure and doped LTB is equal to the standard NLO material, KDP. The nonlinear optical parameters of LTB:Cu nanoparticles say, nonlinear refractive index, nonlinear absorption coefficient and third order nonlinear optical susceptibility were determined to be of the order of 10(-8)cm2/W, 10(-2) cm/W and 10(-5) esu, respectively. The optical power limiting behavior of the samples were studied by Z-scan technique with (532 nm, 50 mW) Nd:YAG laser and the limiting threshold values are found to be 22.7 mW for 0.01 M and 24.9 mW for 0.03 and 0.05 M LTB:Cu nanoparticles.
authors.affiliation: School of Physics, Bharathidasan University, Tiruchirappalli 620024, India. Electronic address: dhanus2k3@yahoo.com.
authors.forename: S
authors.initials: S
authors.lastname: Dhanuskodi
authors.affiliation: School of Physics, Bharathidasan University, Tiruchirappalli 620024, India.
authors.forename: R
authors.initials: R
authors.lastname: Mohandoss
authors.affiliation: Division of Physics, School of Advanced Sciences, Vellore Institute of Technology University, Chennai 600048, India.
authors.forename: G
authors.initials: G
authors.lastname: Vinitha
authors.affiliation: Department of Physics, Manonmaniam Sundaranar University, Tirunelveli 627 012, India.
authors.forename: D
authors.initials: D
authors.lastname: Pathinettam Padiyan
mesh_terms: D001881:Borates / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D049449:Luminescence; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D044367:Phase Transition; D013056:Spectrophotometry, Ultraviolet; D014961:X-Ray Diffraction
chemical_list: D001881:Borates; C021755:tetraborate; D003300:Copper
keywords: Nonlinear optics; Sol-gel processing; Structural characterization