Optical nonlinearity and photoluminescence in CuI doped glass

• Published in: Optical materials 2006-04, Vol.28 (5), p.569-573
• Main Authors: Wei, T.H., Wen, T.C., Hwang, L.C., Lee, S.C., Chou, W.Y., Hu, S.J., Wang, J.H.
• Format: Article
• Language: English
• Subjects: Amorphous materials, glasses and other disordered solids; Condensed matter: electronic structure, electrical, magnetic, and optical properties; CuI doped borosilicate glass; Exact sciences and technology; Free carrier absorption; Fundamental areas of phenomenology (including applications); Glasses, quartz; Nonlinear optics; Optical materials; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical susceptibility, hyperpolarizability; Optics; Photoluminescence; Physics
• ISSN: 0925-3467; 1873-1252
• DOI: 10.1016/j.optmat.2005.09.075

CuI embedded in borosilicate glasses are prepared by a melt and heat-treatment method. We obtain the free carrier absorption cross section σ ≈ 1.0 × 10 −17 cm 2 and the two-photon absorption coefficient β ≈ 0.14 cm/GW by means of the Z-scan method using 6-ns laser pulses at 532 nm, with an irradiation I 0 ≈ 16 MW/cm 2. Upon excitation with 355 nm laser pulses at room temperature, very bright luminescence is observed, while the peak position shifts to lower energy as the band gap of CuI decreased by crystal growth. We also observed that the peak intensity varies linearly with the input intensity. The results could be attributed to the radiative recombination associated with traps or defects from impurities in the CuI microcrystallites.