It is well known in optics that the refractive index is an important optical parameter of material. A novel method to
measure refractive index of glass has been reported in this paper. This method can be used to measure the refractive
index of the special laboratory prepared glass which is small, irregularly shaped by measuring its absorption
spectrum. And we have measured the refractive index of the laboratory prepared germanium-lead glass (1)
(70GeO2-10Pb-10BaO -10K2O), germanium-lead glass (2) (60GeO2-20Pb-10BaO-10K2O),germanium-lead glass
(3) (50GeO2-30Pb-10BaO-10K2O) by measuring the absorption spectra of them with the new method. The
experiment results show that the peaks position of the absorption shift forward the long wavelength and the
refractive indexes increase with the increasing of Pb in germanium lead glasses. The above obtained refractive
indexes are similar with the data which measured by the spectroscopic ellipsometry and the error less than 1%. The
error analysis indicates that this method has high degree accuracy. We predict that the new method has a potential
application in refractive index measurement for glass.
An optical temperature sensor based on Yb3+ and Er3+ codoped La2(WO4)3 phosphor for using in the high
temperature region is discussed on the basis of fluorescence intensity ratio (FIR) method. The
dependence of temperature on the upconversion green emission was intensive studied when the
temperature increased from 300 K to 550 K under the excitation of 971 nm laser diode. The
fluorescence intensity ratio of the two green emissions bands centered at 525 nm, 545 nm changed
dramatically with the thermal treatment. By analyzing the experimental data according to the FIR
method, the result on the thermometric property of La2(WO4)3:Yb3+, Er3+ was obtained and it shows
that the sensitivity of La2(WO4)3:Yb3+, Er3+ reached the maximal value of about 0.0097 K-1 at the
temperature of 510 K, even when the temperature was as high as 900 K, the sensitivity could still
exceed 0.007 K-1. Results indicate that La2(WO4)3:Yb3+, Er3+ has higher sensitivity for thermometry in
high temperature area. Owing to its good thermal stability, low synthesis cost and high sensitivity,
La2(WO4)3: Yb3+, Er3+ phosphor has potential application in optical temperature sensing.
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