Optical properties and ultrafast optical nonlinearity of Yb3+ doped sodium borate and bismuthate glasses

Karthikeyan, B.; Suchand Sandeep, C. S.; Cha, Jaemine; Takebe, Hiromichi; Philip, Reji; Mohan, S.
May 2008
Journal of Applied Physics;May2008, Vol. 103 Issue 10, p103509
Academic Journal
In this paper, we report the optical and ultrafast nonlinear optical properties of Yb3+ doped sodium borate and bismuthate glasses. The glasses have been prepared through the melt quench technique. Optical absorption measurements show compositional dependent absorption spectrum of Yb3+, which is due to the higher crystal field induced by Bi3+ ions. Local structure of the glasses has been identified by using Fourier transform infrared and Raman studies. From open aperture z-scan measurements done by using 100 fs laser pulses, the ultrafast optical nonlinearity in these materials is calculated at the nonresonant excitation wavelength of 800 nm. The measured three-photon absorption originates from the glass host, with contributions from the nonbridging oxygens and the nonlinear electronic polarization of the Bi3+ ions.


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