RT info:eu-repo/semantics/bachelorThesis
T1 Numerical simulations of micro and nano-structured optical waveguides inside YAG crystals
A1 Santos Ramos, Paul
A2 Grado En Física
K1 numerical simulations
K1 optical systems
K1 photonic crystals
AB The formation and propagation of light waves inside an Er:YAG photonic crystal has been studiedfor a pattern of concentric rings formed by air pores; with the purpose of applying it in optical systems incorporating conventional optical fibres, using simulations performed by means of the RSoftCAD:BeamPROP and WinPLOT softwares. Firstly, the importance of obtaining new laser sourcesin eye-safe wavelength regions in the current scientific and technological context is highlighted, andhow the implementation of these structures would be a breakthrough for generating and propagating this type of waves. Secondly, a brief introduction is given to the functioning of laser devices,optical fibres and the theoretical basis of the study of photonic crystals. The properties of thisnew type of photonic crystal structure and its manufacturing method are also discussed. Oncethe theoretical part has been explained, the operation of the RSoft CAD:BeamPROP program,which allows photonic crystals to be modelled with the desired conditions, and the WinPLOTdata analysis program are presented and explained. In the first part, simulations were conductedto analyze the emission of a wave with a wavelength of 1645 nm from an Er:YAG crystal towardsan optical fiber. The focus was on investigating the fundamental modes of different configurationsof a structure composed of concentric rings of pores and examining the parameters that affect thedistribution of the electric field within the mode. In the second part, simulations were performedto study the propagation of the previously obtained fundamental modes. The objective was toanalyze and identify the factors within the structure of the concentric ring pores that impact thepower transmitted by the wave through the material. The factors contributing to the formationand propagation of higher-order modes were also examined to determine the optimal configurationthat minimizes losses during propagation and the formation of higher-order modes. Finally, thereverse scenario was explored in which a conventional optical fiber, referred to as ’6/125 PrecisionMatched Passive Single-Mode 1550-nm Double Clad Fiber’, with a mode field diameter (MFD) of7.4 µm, directs a Gaussian wave with a wavelength corresponding to one of the emission wavelengths of Er:YAG crystal, specifically λ = 1645 nm, towards the crystal. Similar to the previoussection, the analysis focused on identifying the factors within the structure of the concentric ringpores that influence the power transmitted by the wave through the material, losses due to wavecoupling, and the generation of higher-order modes during propagation.
YR 12/0
FD 12/09/2023 21:03
LK http://riull.ull.es/xmlui/handle/915/33758
UL http://riull.ull.es/xmlui/handle/915/33758
LA en
DS Repositorio institucional de la Universidad de La Laguna
RD 13-nov-2025