Enhancement of second harmonic generation signal in thermally poled glass ceramic with NaNbO{sub 3} nanocrystals
- Institut de Chimie de la Matiere Condensee de Bordeaux--UPR 9048 CNRS, Chateau Brivazac, Avenue du Dr. Schweitzer, 33608 Pessac Cedex (France)
Glass ceramic composites were prepared by bulk crystallization of NaNbO{sub 3} in sodium niobium borate glasses. A homogeneous bulk crystallization of the NaNbO{sub 3} phase takes place during heat treatments that produces visible-near infrared transparent materials with {approx}30 nm NaNbO{sub 3} nanocrystallites. Upon thermal poling, a strong Na{sup +} depleted nonlinear optical thin layer is observed at the anode side that should induce a large internal static electric field. In addition, the {chi}{sup (2)} response of the poled glass ceramic composites increases from 0.2 up to 1.9 pm/V with the rate of crystallization. Two mechanisms may be considered: a pure structural {chi}{sup (2)} process connected with the occurrence of a spontaneous ferroelectric polarization or an increase of the {chi}{sup (3)} response of the nanocrystallites that enhances the electric field induced second harmonic generation process.
- OSTI ID:
- 20884716
- Journal Information:
- Journal of Applied Physics, Vol. 100, Issue 6; Other Information: DOI: 10.1063/1.2259816; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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