![]() ![]() In recent years, thermally drawn multifunctional fibers have emerged as a new yet promising route to enable unprecedented development in information technology. However, the conventional step‐index configured silica optical fibers have scarcely altered since their invention. These discoveries pave the way towards a new generation of glass based laser written devices, both in bulk and fibers forms, for either high temperature operation, high laser power propagation or long lifetime applications like optical data storage, sensors for structural heath monitoring or optics in harsh environment.Ībstract As the fundamental building block of optical fiber communication technology, thermally drawn optical fibers have fueled the development and prosperity of modern information society. On the other hand, non-conventional fiber fabrication methods such as the molten core technique or 3D printing preform are also investigated to tentatively improve the thermal stability of fs-laser imprinted modifications through the aspect of glass preparation. We seek to analyze the effect of the glass chemical composition and the laser writing parameters on the thermal stability of the imprinted optical properties.On the one hand, we tentatively reveal the underlying mechanisms at the origin of the observed birefringence and their entanglement in bulk silicate glasses: oriented point defects, stress fields from several contributions, nanostructures and texturation, etc. thesis is to figure out the relationship between different type of modifications induced by fs laser in glasses and fibers (particularly silica and aluminosilicate) that are fabricated by various methods, and make the link between chemistry of materials and femtosecond laser-induced transformations. These structural modifications could be an ideal support to imprint various optical functions that could withstand high temperature operation.In this context, the objectives of this Ph.D. Thermal stability of these devices may therefore be achieved by judicious application of glass preparation, glass annealing and glass laser irradiations.From a fundamental point of view, femtosecond laser direct writing allows to take profit of light forces that act on the plasma and its nanostructuring leading to the nucleation - growth of nanocavities or even nanocrystals depending on the chosen compositions. The key enablers to meet these requirements are related to the intrinsic nature of the glass material that composes the devices, and more specifically its glass structure and associated properties such as viscous flow, chemical migration, and stress relaxation. Of particular relevance, these devices include live diagnostics with embedded optical sensor composites for aircraft, helicopters, and space infrastructure, temperature/pressure sensing in increasingly deeper and hotter oil bores, or again monitoring and mapping of temperature distribution in power plants, furnaces, and chemical reactors. A new generation of devices that operate in extreme environments (particularly those operating above 700☌ and up to 1500☌), including environments with additional challenges such as radiation and intense optical fields (e.g., high power lasers), must be capable of withstanding gradual annealing and degradation, or aging, over time. If you have further questions about this article, contact Dell Technical Support.Harsh environmental sensing using optical fiber technologies is a rapidly growing field of research. Complete the installation and then restart your computer.Under the "Select Driver Component" table, check the box "Perform a Clean Installation," and click Next ( Figure 2). ![]() These should all be checked by default, leave them all checked ( Figure 2).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |