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Título: DEVELOPMENT AND CHARACTERIZATION OF A CHOLESTERIC LIQUID CRYSTAL LASER SYSTEM COUPLED TO AN OPTICAL FIBER
Autor: MICHELE FIGUEIREDO MOREIRA
Colaborador(es): ISABEL CRISTINA DOS SANTOS CARVALHO - Orientador
PETER PALFFY MUHORAY - Coorientador
Catalogação: 10/AGO/2004 Língua(s): PORTUGUESE - BRAZIL
Tipo: TEXT Subtipo: THESIS
Notas: [pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio.
[en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio.
Referência(s): [pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=5261&idi=1
[en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=5261&idi=2
DOI: https://doi.org/10.17771/PUCRio.acad.5261
Resumo:
In this work, we have studied the viability of developing a cholesteric liquid crystal (CLC) laser system coupled into an optical fiber aiming its application as temperature sensor. Sensors made of CLC laser coupled to optical fibers are a very attractive proposition due to the enormous advantages of the optical fibers and the response of the liquid crystal to various external stimuli. The laser emission occurs at the low energy edge of the reflection band, and the corresponding wavelength is determined by the pitch and the extraordinary refractive index. These parameters can be altered by a change in the external temperature, leading to variations in the wavelength of the CLC laser emission, which can be used to monitor the external temperature. We obtained a stable laser emission in a CLC laser system coupled into an optical fiber when pumped by the second harmonic of a Nd:YAG laser. A technique to anchor the liquid crystal at the optical fibers ends was developed. The temperature dependence of the laser emission was investigated in two situations, placing the CLC laser between optical fibers and into the glass cells. Several liquid crystals were studied in order to optimize the laser response with temperature. Discrete variations in the temperature dependence of the laser emission wavelength were observed when the glass cell system was used. We associated this behavior to a temperature dependence of the surface anchoring of the liquid crystal molecules in the glass surface.
Descrição: Arquivo:   
COVER, ACKNOWLEDGEMENTS, RESUMO, ABSTRACT, SUMMARY AND LISTS PDF    
CHAPTER 1 PDF    
CHAPTER 2 PDF    
CHAPTER 3 PDF    
CHAPTER 4 PDF    
CHAPTER 5 PDF    
CHAPTER 6 PDF    
CHAPTER 7 PDF    
REFERENCES AND ANNEX PDF