Academic Journal
Analysis and Design of Infrared Fiber Bundles for Large Field-of-View Thermal Imaging
| العنوان: | Analysis and Design of Infrared Fiber Bundles for Large Field-of-View Thermal Imaging |
|---|---|
| المؤلفون: | Lopez-Zelaya, Cesar A |
| المصدر: | Honors Undergraduate Theses |
| بيانات النشر: | STARS |
| سنة النشر: | 2021 |
| المجموعة: | University of Central Florida (UCF): STARS (Showcase of Text, Archives, Research & Scholarship) |
| مصطلحات موضوعية: | optical fibers, chalcogenide glass, infrared imaging, wide-angle imaging, compact imaging system, coupled-mode theory, Optics |
| الوصف: | During the DARPA SCENICC program, J. Ford, et al., demonstrated that CFBs provide a compelling route to compact, wide angle imagers. Monocentric lenses readily provide diffraction-limited images over wide field but onto a hemispherically curved image surface. They demonstrated visible CFBs can be tapered, cut and polished to relay curved images to flat sensors. We have shown that this provides a volumetric imaging efficiency a hundredfold larger than bulk optics can produce; a hundred times the resolution in the same volume or a hundred times less volume for the same resolution. Ford's work leveraged commercial fiber bundles available for the visible spectrum based on silica. We have developed hybrid fiber bundles using step-index confinement between chalcogenide glass cores and polymer cladding with high index-contrast. The high contrast is necessary to provide tight confinement to the high-index As-Se core with minimal crosstalk between closely spaced cores. Tight confinement also minimizes absorption losses in the PEI polymer cladding. The high contrast of this system also provides a large NA to optimize coupling into the CFB from fast lenses. We introduce disorder into the core radius as a mechanism to further decouple adjacent cores, reduce crosstalk and increase fill-factor. We present coupled-mode theory, modal crosstalk superposition, and finite-element modelling to quantify coupling losses and crosstalk as a function of geometry and disorder. We fabricated preforms, drew small fiber bundles and characterized optical properties of the bundles to aid scale-up to megapixel MWIR CFBs. |
| نوع الوثيقة: | text |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | https://stars.library.ucf.edu/honorstheses/922; https://stars.library.ucf.edu/cgi/viewcontent.cgi?article=2014&context=honorstheses |
| الاتاحة: | https://stars.library.ucf.edu/honorstheses/922 https://stars.library.ucf.edu/cgi/viewcontent.cgi?article=2014&context=honorstheses |
| رقم الانضمام: | edsbas.818D2F62 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |