Thermal–optical properties of Ga:La:S glasses measured by thermal lens technique

Thermo-optical properties measurements in chalcogenide glasses using thermal relaxation and thermal lens methods

“…The average D for these chalcogenide glass samples ($2.7 · 10 À3 cm 2 /s) is approximately the same as that obtained in a similar chalcogenide glass recently measured with the TL method [14,15]. The comparison with other glasses shows that the thermal diffusivity of chalcogenides is similar to that of fluorides [12], but it is 50% of the diffusivities obtained for low calcium aluminosilicate glasses [16], and approximately two times larger than that of a chalcohalide glass [17].…”

Thermal lens study of PbO–Bi2O3–Ga2O3–BaO glasses doped with Yb3+

“…This is interesting for athermal devices, where ds/dT = 0 [21], which are characterized by the absence of optical distortions originated from thermal expansion and variation of the refractive index with temperature. Moreover, the thermal conductivity and the thermal diffusivity of PbO-Bi 2 O 3 -Ga 2 O 3 -BaO glasses are comparable to LG750, a phosphate commercial glass [19,20] and also to Ga:La:S glasses [10]. Fig.…”

“…Table 1 shows some thermo-optical parameters of some selected glasses (doped and undoped with Yb 3+ ) for comparison purposes. It can be seen that the PbO-Bi 2 O 3 -Ga 2 O 3 -BaO glasses present small ds/dT when compared to other glasses [10,[16][17][18][19][20]. This is interesting for athermal devices, where ds/dT = 0 [21], which are characterized by the absence of optical distortions originated from thermal expansion and variation of the refractive index with temperature.…”

“…Some results of thermal lens investigation in different compositions of glasses [9,10] have been reported in previous literature; Jacinto et al have recently reported the thermal lens investigation of the determination of the fluorescence quantum efficiency [11] of Yb 3+ -doped phosphate glasses. However, far as is known, there are no reports related to thermal lens studies with PbO-Bi 2 O 3 -Ga 2 O 3 -BaO glasses doped with Yb 3+ .…”

“…The thermal lens experiment was performed with the two-beam mode mismatched arrangement [10,13]. The excitation beam was provided by a Ti:Sapphire, tuned in the region from 890 nm to 1000 nm and the probe laser beam by an He-Ne laser (632.8 nm).…”