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

Abstract

2009Influence of temperature and excitation procedure on the athermal behavior of Nd(3+)-doped phosphate glass: Thermal lens, interferometric, and calorimetric measurements JOURNAL OF APPLIED PHYSICS, v.106, n.7, 2009 http://producao.usp.br/handle/BDPI/16575 In this work, thermal and optical properties of the commercial Q-98 neodymium-doped phosphate glass have been measured at low temperature, from 50 to 300 K. The time-resolved thermal lens spectrometry together with the optical interferometry and the thermal relaxation calorimetry methods were used to investigate the glass athermal characteristics described by the temperature coefficient of the optical path length change, ds / dT. The thermal diffusivity was also determined, and the temperature coefficients of electronic polarizability, linear thermal expansion, and refractive index were calculated and used to explain ds / dT behavior. ds / dT measured via thermal lens method was found to be zero at 225 K. The results provided a complete characterization of the thermo-optical properties of the Q-98 glass, which may be useful for those using this material for diode-pumped solid-state lasers.

Pulsed thermal lens technique for Cr(VI) traces detection in water

“…Sin embargo, TLS es una técnica muy utilizada por su alta sensibilidad y bajo límite de detección. Tiene un amplio espectro de aplicaciones incluyendo medición de trazas y caracterización de líquidos líquidos, sólidos y gases permitiendo su uso en medicina, industria y control ambiental 3,[5][6][7][8][9][10][11][12][13][14][15] . Esta técnica se basa en el estudio de la variación de índice de refracción producido por calentamiento en una muestra debido a la relajación térmica de sus moléculas, las cuales fueron previamente excitadas con una fuente luminosa enfocada.…”

Estudo do comportamento atérmico no sistema vítreo fosfato PANK em função da razão K2O/Al2O3

“…Durante o trabalho de mestrado de Filho [17], ao aplicar a técnica de LT em função da temperatura no vidro PAN5K dopado com Nd [73] no vidro fosfato Q98 utilizando a técnica de LT. Assim fica evidente que aplicando a técnica de LT nesse material é possível comparar os dois resultados, visto que ambos dependem do parâmetro ds/dT. O resultado aplicando a técnica de LT no vidro PAN5K já foi obtido e apresentado na minha dissertação de mestrado [17].…”