- Interactive movable mirrors reflection light beamapp plus#
- Interactive movable mirrors reflection light beamapp series#
Il conduit, au cours de la propagation dans la fibre, à un transfert progressif de l’énergie des modes propagés vers le mode fondamental, les interactions non linéaires en jeu étant d’autant plus complexes que le nombre de modes guidés est important. Dans le même temps, le phénomène d’autonettoyage par effet Kerr a récemment été observé dans des fibres multimodales à gradient d’indice parabolique (GRIN). Ces techniques, de pré-compensation de front d’onde, ont démontré leur efficacité avec des rayonnements se propageant en régime linéaire en général, pour par exemple faire de l’imagerie déportée par fibre.
Ce n’est pas le seul domaine d’application, aussi nombre de techniques d’optique adaptative ont été développées pour contrôler le profil de champ, généralement tavelé, en sortie de fibre multimodale. Modeling and experiments attest that the shaping is effective even with a highly multimode fiber amplifier carrying up to 127 modes.Ĭette dernière décade, les fibres multimodales ont eu un regain d’intérêt dans la communauté scientifique, lié en grande partie à la possibilité d’augmenter la bande passante de liaisons optiques par les nouvelles techniques de multiplexage spatial. The shaping approach still works under gain saturation, showing the robustness of the method.
Tailoring the wavefront to shape the amplified light can also serve to improve the effective gain. Cleaning and narrowing of the amplifier far-field pattern was realized as well. We present experimental results and simulations showing the shaping of a single sharp spot at different places in the output cross-section of an ytterbium-doped fiber amplifier. Profiling of the wavefront was achieved by a deformable mirror in combination with an iterative optimization process. We demonstrate that appropriate structuration of the input beam wavefront can shape the light amplified by a rare-earth-doped multimode fiber. Randomization still applies when scattering or multimode propagation occurs in gain media. LED fixtures inside each of the artwork’s vertical components are activated by sound and respond by producing light, transforming the front-facing panels from mirrored to transparent, while the interior panels remain mirrored, creating an infinite, colorful reflection and forest of light.Propagation of light in multimode optical fibers usually gives a spatial and temporal randomization of the transmitted field similar to the propagation through scattering media. The artwork is also programmed to respond to sound with light, allowing visitors to interact with the artwork and affect its appearance using their voices and bodies. While the exterior is a monochromatic mirror that reflects the urban environment, the river and visitors themselves, the interior’s mirrored surface is tinted with the full-color spectrum, providing another layer of vibrancy and interest. Through a panoramic array of mirrors and sound-responsive lights, Mirror Mirror will visually blend the waterfront, the fabric of Old Town, and the activity of pedestrians in the new park.
Interactive movable mirrors reflection light beamapp series#
The materials and interactive nature of the artwork reference the special type of lens used at Alexandria’s own historic Jones Point Lighthouse – called the Fresnel lens – the most advanced lens technology of the 1800s, which used a series of prisms to concentrate the light source and direct it into a narrow horizontal beam that was projected outward. This structure in-the-round, like a lighthouse, is both a place to look outward at your surroundings and a beacon to be seen from afar and watched. The artwork takes the form of an opened circle, 25 feet in diameter and 8 feet high, that visitors can walk inside and around.