Temperature dependence of thermo-optical properties of fluoride glasses determined by thermal lens spectrometry

Abstract

In this work we report on the use of the thermal lens spectrometry to determine the absolute values of thermal diffusivity, thermal conductivity, and temperature coefficient of optical path-length change of several fluoride glasses. The results showed that flouride glasses doped with minor quantities of Ga, In, and Zn exhibit thermal conductivities and thermal diffusivities roughly 20% larger than that of fluorozirconate ͑ZBLAN͒ glasses, whereas their temperature coefficients for the optical path-length change was found to be 50% smaller. This suggests that these fluoride glasses may be considered as promising candidates for high power laser applications. We have also demonstrated how this technique can be used for the complete thermo-optical properties characterization as a function of temperature. ͓S0163-1829͑99͒01342-9͔

Inversion in the temperature coefficient of the optical path length close to the glass transition temperature in tellurite glasses

“…This is understood as the sample characteristic response denoting how the optical path changes with the laser-induced heat deposited per unit of volume. 10 Figure 3 shows ds / dQ͑T͒ for the TeLi, TeLiTi-5, and TeLiTi-10 glasses. The inset shows ds / dQ͑T͒ from room temperature up to the maximum, corresponding to T g values.…”

“…[1][2][3] The two-beam mode-mismatched thermal-lens ͑TL͒ method has been used to determine the thermo-optical properties of several optical materials as a function of temperature. 10,11 The remote character may make the TL technique a valuable tool for the complete characterization of transparent materials as a function of temperature. Therefore, in this study, the TL method was applied to determine the thermo-optical properties of three different tellurite glasses as a function of temperature.…”

“…A similar observation was reported for fluoride glasses. 10,11 The T g values can be determined by D͑T͒ curves, as indicated in Fig. 2, and were 264, 288, and 318°C for the TeLi, TeLiTi-5, and TeLiTi-10 glasses, respectively.…”

Thermal lens scanning of the glass transition in polymers

“…Electronic mail: mlbaesso@uem.br ment presents, in principle, no extra difficulty. [28][29][30] It is precisely this aspect we take advantage of to carry on the thermal properties measurements of polymers as a function of temperature.…”

Influence of temperature and excitation procedure on the athermal behavior of Nd3+-doped phosphate glass: Thermal lens, interferometric, and calorimetric measurements

“…TL spectrometry ͑TLS͒ has been applied to characterize several kinds of materials in a wide temperature range, from 4 to 800 K. [16][17][18][19][20][21] Besides the thermal diffusivity ͑D͒ values, combining the data measured with this method with those by optical interferometry ͑OI͒ ͑Ref. 22͒ and thermal relaxation calorimetry ͑TRC͒, 23 a general picture about the material thermo-optical properties can be obtained, such as the values of ds / dT, k, and .…”