Third order nonlinear and optical limiting properties of alkaline bismuth borate glasses. (November 2018)

• Record Type: Journal Article
• Authors: Rao, M. Veeramohan; Ravi Kanth Kumar, V.V.; Shihab, N.K.; Rao, D. Narayana
• Is Part Of: Optics & laser technology. Volume 107(2018)
• Page Start: 110
• Page End: 115
• Publication Date: 2018-11
• Subjects: Z-scan -- Third order nonlinearity -- Optical limiting -- Two photon absorption -- Three photon absorption -- Nanosecond -- Femtosecond -- Picosecond; Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2018.05.035
• Languages: English
• ISSNs: 0030-3992

Abstract

Highlights: NLO properties of RBB glasses were studied at wavelength 800 nm & 532 nm. NLO properties of RBB glasses were studied for three time domains fs, ns & ps. BBB glass exhibit three photon absorption. SBB & CBB glasses exhibit two photon absorption. RBB glasses shows low optical limiting threshold values in ns regime. Abstract: Transparent Alkaline Bismuth Borate glasses (10RO-35Bi2 O3 -55B2 O3, where R = Ba, Ca & Sr) were prepared by melt-quenching method. The optical band gap values of the glasses are obtained from absorption spectra and found to increase due to the presence of alkaline earth ion in the order of Ba < Sr < Ca whereas optical basicity values follows the reverse trend. Nonlinear optical properties and optical limiting properties of the glasses were investigated at wavelengths of 532 and 800 nm for ns and ps and fs time domains respectively by Z-scan technique. Two-photon absorption is regarded as the dominant mechanism in the case of Sr and Ca based glasses whereas glass with Ba exhibit two photon induced three photon mechanism. Optical limiting characteristics are also reported in fs and ns regimes for these glasses.