The lanthanum strontium aluminium tantalum oxide(LSAT)crystal is grown by means of a floating or pulling method.Its optical transmittance,refractive indices in visible and near-infrared areas and its dispersion curve ...The lanthanum strontium aluminium tantalum oxide(LSAT)crystal is grown by means of a floating or pulling method.Its optical transmittance,refractive indices in visible and near-infrared areas and its dispersion curve are reported.The transparence range of LSAT is from 0.45 to 4.2μm and its refractive index is 2.0244.展开更多
The light-induced absorption of barium titanate doped with rhodium(BaTiO3:Rh)is characterized in near-infrared spectral region.It decreases with the wavelength of the probe beam from 700 to 840 nm,and is significantly...The light-induced absorption of barium titanate doped with rhodium(BaTiO3:Rh)is characterized in near-infrared spectral region.It decreases with the wavelength of the probe beam from 700 to 840 nm,and is significantly dependent on the polarization of the probe beam and insensitive to the polarization of the pump beam.The light-induced absorption as high as 0.32 cm^(-1) is obtained for ordinary-polarized probe beam atλ=730 nm.The observations are interpreted by the photorefractive two-center or one center with three valence states model.展开更多
The spectra of Cm and Cm thin films over a wide energy range (0.6 to 6.5eV) are measured by transmission spectroscopy and photothermal deflection spectroscopy (PDS), and the optical absorption coefficients are obtaine...The spectra of Cm and Cm thin films over a wide energy range (0.6 to 6.5eV) are measured by transmission spectroscopy and photothermal deflection spectroscopy (PDS), and the optical absorption coefficients are obtained. The optical transitions for the Cm and Cw thin films are analyzed according to the molecular orbital model. The weak absorption spectra of the fullerenes are similar to that of amorphous silicon. The optical energy gaps are given by Tauc’s plots as 1.75 and 1.65eV for C60 and C70 thin films, respectively. The disorders in the fullerene films, which resulted in band-tail state or defect state, are indicated by Urbach edge and sub-gap absorption. It is the disorder that brought the difficulty in determination of the energy gap for fullerenes. The effects of the deflection medium and substrate on the weak absorption spectra of fullerene films are also discussed.展开更多
文摘The lanthanum strontium aluminium tantalum oxide(LSAT)crystal is grown by means of a floating or pulling method.Its optical transmittance,refractive indices in visible and near-infrared areas and its dispersion curve are reported.The transparence range of LSAT is from 0.45 to 4.2μm and its refractive index is 2.0244.
基金Supported by the National Natural Science Foundation of China under Grant No.59672005。
文摘The light-induced absorption of barium titanate doped with rhodium(BaTiO3:Rh)is characterized in near-infrared spectral region.It decreases with the wavelength of the probe beam from 700 to 840 nm,and is significantly dependent on the polarization of the probe beam and insensitive to the polarization of the pump beam.The light-induced absorption as high as 0.32 cm^(-1) is obtained for ordinary-polarized probe beam atλ=730 nm.The observations are interpreted by the photorefractive two-center or one center with three valence states model.
基金Project supported by the National Natural Science Foundation of China.
文摘The spectra of Cm and Cm thin films over a wide energy range (0.6 to 6.5eV) are measured by transmission spectroscopy and photothermal deflection spectroscopy (PDS), and the optical absorption coefficients are obtained. The optical transitions for the Cm and Cw thin films are analyzed according to the molecular orbital model. The weak absorption spectra of the fullerenes are similar to that of amorphous silicon. The optical energy gaps are given by Tauc’s plots as 1.75 and 1.65eV for C60 and C70 thin films, respectively. The disorders in the fullerene films, which resulted in band-tail state or defect state, are indicated by Urbach edge and sub-gap absorption. It is the disorder that brought the difficulty in determination of the energy gap for fullerenes. The effects of the deflection medium and substrate on the weak absorption spectra of fullerene films are also discussed.
