Thermal lens spectrometry in pyroelectric lithium niobate crystals |
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Authors: | M R R Gesualdi C Jacinto T Catunda M Muramatsu V Pilla |
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Institution: | 1.Centro de Engenharia, Modelagem e Ciências Sociais Aplicadas,Universidade Federal do ABC,Santo André,Brazil;2.Instituto de Física,Universidade Federal de Alagoas,Maceió-AL,Brazil;3.Instituto de Física de S?o Carlos,Universidade de S?o Paulo,S?o Carlos,Brazil;4.Instituto de Física,Universidade de S?o Paulo,S?o Paulo,Brazil;5.Universidade do Vale do Paraíba,S?o José dos Campos,Brazil |
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Abstract: | In this work, the light-induced lens effect due to thermal and/or photorefractive processes was studied in pyroelectric (undoped
and Fe2+-doped) lithium niobate crystals (LiNbO3) using thermal lens spectrometry with a two-beam (pump–probe) mode-mismatched configuration. The measurements were carried
out at two pump beam wavelengths (514.5 and 750 nm) to establish a full understanding of the present effects in this material
(thermal and/or photorefractive). We present an easy-to-implement method to determine quantitative values of the pyroelectric
coefficient (dP
s/dT), its contribution to the thermal effect and other thermo-optical parameters like thermal diffusivity (D), thermal conductivity (K) and temperature coefficient of the optical path length change (ds/dT). These measurements were performed in LiNbO3 and LiNbO3:Fe (0.1 ppm Fe2+) crystals with c axis along the direction of laser propagation. |
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Keywords: | PACS" target="_blank">PACS 42 65 Hw 42 70 Nq 78 20 Nv |
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