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Habilitation Thesis
DOI
https://doi.org/10.11606/T.76.2015.tde-28082015-095317
Document
Author
Full name
Tomaz Catunda
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2015
Committee
Bagnato, Vanderlei Salvador (President)
Davidovich, Luiz
Ioriatti Júnior, Lidério Citrângulo
Leite, José Roberto Rios
Scalabrin, Artemio
Title in Portuguese
Estudo de índice de refração não-linear e efeitos fototermicos em sólidos dopados
Keywords in Portuguese
Eficiência quântica
Índice de refração não-linear
Lasers de estado sólido
Lente térmica
Abstract in Portuguese
Neste trabalho apresento resultados de medidas de índice de refração não linear n2 e efeito térmico em diversos sólidos dopados. Na medida de n2 usamos a técnica de Z-scan resolvida no tempo que se mostrou muito superior a técnica de mistura de ondas. Nós demonstramos um novo método para determinação da intensidade de saturação via refração não-linear. Em alguns experimentos estudamos a espectroscopia não-linear n2(ω)usando lasers sintonizáveis em tomo da linha R do Cr+3. Também fizemos medidas do efeito térmico (ligado a dn/dT) usando a técnica de Lente Térmica de modo descasado. Nos vidros fluorindato dopado com Nd e cristal fluoreto dopado com Cr, observamos lente térmica negativa (ds/dT < O)e efeito térmico bem maior que o devido a n2. Nós também demonstramos um novo método para medida de eficiência quântica de fluorescência usando a técnica de Lente Térmica
Title in English
Nonlinear refractive index and photothermal effects in ion doped solids
Keywords in English
Nonlinear refractive index
Quantum efficiency
Solid state lasers
Thermal lens
Z-scan
Abstract in English
In this work results of nonlinear refractive index n2 and thermal effects in several ion doped solids (crystals and glasses) are presented. The time-resolved-scan technique was shown to be much superior than four-wave-mixing for n2 measurements. We demonstrate a new method to determine saturation intensity I, by nonlinear refraction. In some experiments, we studied the n2 (ω) nonlinear spectroscopy using tunable lasers in resonance with Cr+3 R fines. We also measured thermal effects (due to dn/dT) using the mode mismatched thermal technique. In the fluorindate glasses doped with Nd the Cr doped fluorite crystal, we observed negative thermal lens (ds/dT2. We also demonstrated a new method for fluorescence quantum efficiency measurements in ion doped solids, using the Thermal Lens technique
 
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Tomaz_LD1171.pdf (7.49 Mbytes)
Publishing Date
2015-08-28
 
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