Publications by authors named "Carlos Mas Arabi"
Article Synopsis
- The study focuses on how pump depletion affects the generation of Kerr cavity solitons in a specific type of optical system called a degenerate optical parametric oscillator.
- The researchers developed a mathematical formula to define the conditions under which these solitons can exist, allowing for deeper analysis of energy conversion efficiency.
- They found that parametric driving methods are more efficient than linear driving methods, especially when there is a significant difference in speed (walk-off) between the continuous wave input and the generated soliton.
Mode-locking is a broad concept that encompasses different processes enabling short optical pulse formation in lasers. It typically requires an intracavity mechanism that discriminates between single and collective mode lasing, which can be complex and sometimes adds noise. Moreover, known mode-locking schemes do not guarantee phase stability of the carrier wave.
View Article and Find Full Text PDFWe theoretically and experimentally investigate type II second harmonic generation in III-V-on-insulator wire waveguides. We show that the propagation direction plays a crucial role and that longitudinal field components can be leveraged for robust and efficient conversion. We predict that the maximum theoretical conversion is larger than that of type I second harmonic generation for similar waveguide dimensions and reach an experimental conversion efficiency of 12%/W, limited by the propagation loss.
View Article and Find Full Text PDFArticle Synopsis
- The study investigates how the unique properties of nanowires, particularly their large index contrast and small transverse dimensions, create strong electric field components that enhance second harmonic generation.
- Through full-vectorial calculations, an efficiency map for nonlinear conversion is developed, highlighting various waveguide dimensions and orientations that can effectively convert a fundamental quasi-TE pump mode at 1550 nm into a higher-order second harmonic mode.
- The findings suggest that III-V wire waveguides have promising capabilities for efficient nonlinear optical applications, especially in telecommunications.
We develop a model for the description of nonlinear pulse propagation in multimode optical fibers with a parabolic refractive index profile. It consists of a 1+1D generalized nonlinear Schrödinger equation with a periodic nonlinear coefficient, which can be solved in an extremely fast and efficient way. The model is able to quantitatively reproduce recently observed phenomena like geometric parametric instability and broadband dispersive wave emission.
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