Studies of Two-photon Absorption in Heavy Metal Oxide Based Glasses

doi:10.3724/SP.J.1077.2010.00289

Abstract

Abstract: A serial of glass samples in Bi₂O₃-B₂O₃-SiO₂ ternary system with high heavy metal oxide (Bi₂O₃) content were prepared by using conventional melting technique. Their linear refractive indexes n at 632.8nm were measured by prismcoupler, it showed that the n values were ranged from 1.9 to 2.1, and increased with increasing Bi₂O₃ content which was due to the high polarizability of Bi ³⁺ ions; their linear absorption spectra were depicted by spectrophotometer, and the optical band gaps Eopg were in the range from 2.229eV to 2.268eV while exhibited decreasing tendency with increasing Bi2O3 content. By employing open apertured Z-scan measurements at various wavelengths (770, 800, and 850nm), nonlinear absorption coefficients β which were due to twophoton absorption (TPA) since the incident photon energy hv (1.61, 1.55, and 1.46eV) of measured wavelengths were between Eopg/2 and Eopg of all samples studied were obtained. The results showed that the glass sample with lowest Bi₂O₃ content exhibited highest TPA coefficients ((3.6~6.1)×10 ^-12 m/W) which indicated as resonatetype induced by gap state at all measured wavelengths, demonstrating the sample can be applied in optical limiter. On the other hand, glass samples with higher Bi₂O₃ content showed offresonatetype TPA only at low wavelength of 770nm, and their TPA coefficients β increased with Bi₂O₃ content leading to the great potentials in all-optical switching (AOS).

Key words: heavy metal oxide, glass, two-photon absorption

CLC Number:

TQ174

CHEN Fei-Fei,XU Tie-Feng,DAI Shi-Xun,NIE Qiu-Hua,SHEN Xiang,WANG Xun-Si. Studies of Two-photon Absorption in Heavy Metal Oxide Based Glasses
[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2010.00289.

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