Estudo das propriedades ópticas do grafeno e sua aplicação como absorvedor saturável em lasers à fibra dopada com érbio

• Ano de defesa: 2015
• Autor(a) principal: Rosa, Henrique Guimarães
• Orientador(a): Souza, Eunézio Antônio de
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Presbiteriana Mackenzie
• Palavras-chave em Português: grafeno; número de camadas de grafeno; empilhamento; transferência de grafeno esfoliado; absorvedor saturável; fibra óptica; pulsos ultracurtos; laser à fibra dopada com érbio
• Palavras-chave em Inglês: graphene; number of graphene layers; stacking; exfoliated graphene transfer; saturable absorber; optical fiber; ultrashort pulses; erbium-doped fiber laser
• Área do conhecimento CNPq: CNPQ::ENGENHARIAS::ENGENHARIA ELETRICA
• Link de acesso: http://dspace.mackenzie.br/handle/10899/24262

In this thesis, we present results on the fabrication, transfer and characterization of chemical vapor deposition (CVD) graphene and exfoliated graphene over glass and optical fiber substrates, to study optical properties of graphene and its application as a saturable absorber for Erbium-doped fiber laser (EDFL). Monolayer CVD graphene and stacked CVD graphene samples were fabricated and characterized, transferred to the transverse face of optical fibers, and a study on the relation between the optical properties of graphene samples and the properties of ultrashort laser pulses generated in (EDFL) was performed. Furthermore, we have developed a technique for transferring exfoliated nanomaterials which allowed us to transfer exfoliated graphene onto optical fiber s faces and align the graphene flake to the fiber core. With this transfer technique it is possible to fabricate samples with controlled number of graphene layers onto optical fiber faces. As application, we demonstrate ultrashort pulse generation in Erbium-doped fiber laser with exfoliated monolayer graphene samples as saturable absorber. This is the first time that ultrashort laser pulses are generated with a single exfoliated monolayer graphene sample.