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Phenomenological studies of femtosecond laser ablation on optical thin films for integrated photonics
摘要： In this work, we present a well-supported procedure to fabricate ridge optical waveguides onto thin films of PLZT by femtosecond laser ablation. To achieve smooth-guiding structures that guarantee good optical performance we have studied the characteristics of ablation threshold for different kinematic conditions of fs laser machining and we have also explored the different ablation regimens for several fluences reached. Furthermore, we characterized the morphology and roughness of ridge waveguides through a modal analysis of scattering loss for waveguides conducted by single and multiple scans. An innovative phenomenological model that describes the sidewall roughness to process parameters is proposed in this paper. With this approach, it is possible to extend the manufacturing method of smooth-guiding structures to many optical thin films by fs micromachining, so as to create integrated photonics devices that can be addressed to different technological applications.
关键词： Thin films,Integrated photonics,Laser materials processing,Optical waveguides,Femtosecond laser ablation
更新于2025-09-16 10:30:52
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Synthesis of colloidal aluminum nanoparticles by nanosecond pulsed laser and the effect of external electric field and laser fluence on ablation rate
摘要： In this paper, the ablation of aluminum was induced by a Q-switched Nd:YAG laser (1064 nm, ~10 ns and 10 Hz) in ethanol at room temperature for producing colloidal nanoparticles. Two different experimental schemes (i.e. the electric field parallel, and perpendicular to the laser propagation path) were used to investigate the dependence of ablation rate on the external electric field characteristics and the laser fluence. The results show that at a constant laser fluence, regardless of the type of scheme, the ablation rate is increased in the presence of electric field. However, the characteristics of craters strongly depend on the direction of the electric field. The results also show that at both schemes with a constant electric field, the ablation rate rises when the laser fluence is increased. According to the results, it can be concluded that the ablation rate enhanced by applying electric field and increasing laser pulse energy.
关键词： Ablation rate,Laser materials processing,Laser ablation efficiency,Electric field,Ethanol interaction ambient
更新于2025-09-16 10:30:52
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Study on processing characteristics and mechanisms of thermally assisted laser materials processing
摘要： Nanosecond pulsed lasers have been widely applied to interact with and characterize many di?erent materials, and industrial users are exploring more avenues for various application processes. For the purpose of achieving broader application, the current challenge is to achieve a high processing e?ciency for laser materials processing. In this study, thermally assisted laser materials processing (TALMP), which introduces heat from an external source to increase the workpiece material's temperature and make it easier to carry out ablation or modi?cation, was developed and investigated. Moreover, to investigate the materials processing characteristics and mechanisms of TALMP, practical applications using TALMP, including surface ablation on WC-Co, and surface polishing on additive manufactured Ti-6Al-4V, were carried out. The results showed that TALMP can be successfully applied to various materials by di?erent laser materials processing applications. Due to the workpiece material's high temperature and heat content, the coupling between laser and target materials can be enhanced; thus, physical ablation and modi?cation for laser surface ablation can be achieved e?ectively. However, with a high o?set temperature, a little decrease of ablation accuracy and quality could occur, and a two-step approach is proposed to eliminate this unwanted e?ect. Moreover, this strategy is proven to be able to achieve the desired surface ablation with high e?ciency and high-quality surfaces. For thermally assisted surface polishing, due to higher temperature ?eld with long duration, a smoother and ?atter polished surface can be obtained more easily. The experimental results proved the superiority and versatility of TALMP.
关键词： Laser polishing,Thermally assisted,Laser materials processing,Laser ablation
更新于2025-09-12 10:27:22
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Hybrid Ho:YAG Laser with 50W Radially-Polarised Output
摘要： Holmium doped radially polarised lasers operating in the 2.1 μm spectral region are of great interest as they provide benefits of operation in the atmospheric transmission window (2.1-2.25 μm), absorption in transparent polymers, as well as the materials processing benefits that are beginning to be realised from utilising select higher order modes [1]. We report on the development of a 50W CW radially polarised Ho:YAG laser operating at 2090nm.
关键词： higher order modes,Ho:YAG laser,atmospheric transmission window,Holmium doped,materials processing,2.1 μm spectral region,radially polarised lasers
更新于2025-09-11 14:15:04
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Vortex Dynamics and Optical Vortices || Optical Vortices Illumination Enables the Creation of Chiral Nanostructures
摘要： We discovered that optical vortices with an annular spatial form and an orbital angular momentum owing to a helical wave front enable us to twist materials, such as metal, silicon and azo-polymer, to form various structured matters including microneedles, chiral nanostructures and chiral surface reliefs. Such structured matters will potentially open the door to advanced devices, for instance, silicon photonic device, biomedical micro-electro-mechanical systems, ultrasensitive detector for chiral chemical composites and plasmonic metasurfaces for chiral chemical reactions.
关键词： chiral structured materials,singular optics,orbital angular momentum,laser materials processing,optical vortices
更新于2025-09-09 09:28:46