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The transition cross sections on the pump and laser wavelength of rare-earth-doped materials are of crucial importance for their performance as amplifiers and lasers and for the understanding of their performance in a rate-equation model. Since typically part of the absorbed pump power is converted to heat, the temperature of the host material increases with increasing pumping. This implies a temperature-dependent...
Terahertz time domain spectroscopy has been done for reverse micellar solution in the temperature range from ∼190 K to room temperature. The temperature dependence of the absorption lineshape demonstrates that dynamics of water in a nanometer-sized droplet change at low temperatures, which will be ascribed to water shedding from reverse micelles.
The scintillation properties of pure SrI2 and SrI2 doped with 0.5%, 0.86%, 2%, and 5% europium were studied. Different techniques were used to measure γ-ray excited pulse-height and scintillation decay time spectra, and to perform X-ray excited and optically excited emission spectroscopy. Eu2+ emission and self-trapped exciton (STE) emission was observed in SrI2:Eu2+ samples. These emissions were...
Temperature dependent two-photon and free-carrier absorption spectra of InSb are measured using a tunable picosecond source via temperature controlled Z-scan experiments and show good agreement with theoretical predictions. Three-photon absorption is also observed.
ldquoDevelopment for advanced thermoelectric conversion systemsrdquo supported by the new energy and industrial technology development organization (NEDO) has been successfully completed as one of the Japanese national energy conservation projects. Three types of the cascaded thermoelectric modules operating up to 850 K in high electrode temperature and two types of Bi-Te thermoelectric modules operating...
The polycrystalline samples of BaSi2, SrSi2, and LaSi were prepared by spark plasma sintering (SPS). The electrical resistivity (rho) and Seebeck coefficient (S) were measured above room temperature. The S of BaSi2 was negative and the absolute values were rather high (-669 muVK-1 at 337 K). The S of SrSi2 was positive and the absolute values were lower (118 muVK-1 at 332 K) than those of BaSi2. For...
In this paper we characterize temperature distribution in an electroabsorption modulator. A self-consistent opto-electro-thermal model is developed that accurately predicts thermal runaway in unoptimized EAM structures. Optimized structures with improved thermal design achieve high power operation with a record damage free power dissipation level in excess of 300 mW. In conclusion, using a thermoreflectance...
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