[Fluorescent Characteristics of Strontium Tetraborate (SrB4O7) Doped with Divalent Lanthanide Elements].

Strontium borate doping with different lanthanide bivalent ions and concentration (SrB4O : Re2+) were synthesized by the high-temperature solid state method. The fluorescent spectral characteristics of SrB4O7 : Re2+ were investigated by the non-polarization con-foucus fluorescence/raman measurement system built by us. The results indicate that the fluorescent spectral characteristics of SrB4O7 : Re2+ is very similar to that of SrB4O7 : Sm2+.

[Superhigh spectral resolution measurement of spectrometer].

The spectral resolution is one of the most important indexes of spectrometer. A new method is put forward for measuring the superhigh spectral resolution based on the Rayleigh criterion and the optical heterodyne, and the uncertainty of this method is analyzed. The spectral resolution of some spectrometer was measured using this method, and the experimental results show that the spectral resolution is higher than 18.

[High temperature Raman spectrum study of LiTaO3].

The high temperature Raman spectrum of LiTaO3 was studied from 298 to 948 K by micro-confocal Raman technique and the mechanism of phase transition from ferroelectric phase to paraelectric phase was studied by analyzing the high wave number Raman peaks of LiTaO3. The experimental results show that all the Raman peaks except 466.7 cm(-1) have a remarkable Raman shift to low frequency when increasing temperature.

[Time domain terahertz spectroscopy of (Pb,La)TiO3 ferroelectric thin films].

Terahertz time-domain spectroscopic technique was applied to investigate the spectral properties of (Pb, La)TiO3 (PLT) ferroelectric thin films prepared on SiO2/Si substrates. The terahertz spectra of three kinds of PLT thin films with different sintering temperatures were observed. According to the experimental data, the absorption coefficients, refraction indexes and dielecric constants of the PLT thin films were computed, and the experimental results of the three kinds of PLT thin films with different sintering temperatures in the effective frequency range were compared.

[Temperature dependence of collagen by Raman spectra].

Raman spectra of collagen I at different temperature were obtained. There was no change at 1003 cm(-1) line, 1302 cm(-1) line moved to a higher wave number, but other lines moved to lower wave number when temperature increased. In addition, the authors observed the temperature dependence of Raman intensity and four denaturation points at 0, 40, 68 and 90 degrees C respectively.