Femtosecond-laser-written three-dimensional waveguide beam splitters in MgO-doped stoichiometric LiTaO3 crystal
[EN]We report on the design and fabrication of three-dimensional (3D) waveguide beam splitters in MgO-doped stoichiometric lithium tantalate (MgSLT) crystals, using femtosecond laser direct writing. A family of compact photonic-lattice-like cladding waveguides are implemented for 3D beam transformat...
| Autores: | , , , , , , , |
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| Tipo de documento: | artigo |
| Estado: | Versão publicada |
| Data de publicação: | 2025 |
| País: | España |
| Recursos: | Universidad de Salamanca (USAL) |
| Repositório: | GREDOS. Repositorio Institucional de la Universidad de Salamanca |
| OAI Identifier: | oai:gredos.usal.es:10366/168578 |
| Acesso em linha: | http://hdl.handle.net/10366/168578 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Beam splitters Beam steering Femtosecond lasers Nonlinear frequency conversion Ultrafast lasers Waveguide cores |
| Resumo: | [EN]We report on the design and fabrication of three-dimensional (3D) waveguide beam splitters in MgO-doped stoichiometric lithium tantalate (MgSLT) crystals, using femtosecond laser direct writing. A family of compact photonic-lattice-like cladding waveguides are implemented for 3D beam transformation: by introducing axial defect-tracks at certain positions, 1 × 2, 1 × 3, and 1 × 4 beam splitters have been successfully fabricated, enabling nearly equalized splitting ratios. The micro-modification of laser irradiation has been investigated through confocal micro-Raman (μ-Raman) spatial mapping experiments. The bulk crystalline properties are well-preserved in the guiding cores. This work provides an effective method for fabricating highly compact 3D devices enabling light guiding and beam steering via femtosecond laser irradiation. |
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