Polymer / glass hollow-core photonic band gap fibers for infrared laser beam delivery

dc.contributor.advisorBayındır, Mehmet
dc.contributor.authorKöylü, Özlem
dc.departmentGraduate Program in Materials Science and Nanotechnologyen_US
dc.descriptionAnkara : The Department of Materials Science and Nanotechnology and the Institute of Engineering and Sciences of Bilkent University, 2011.en_US
dc.descriptionThesis (Master's) -- Bilkent University, 2011.en_US
dc.descriptionIncludes bibliographical references leaves 87-93.en_US
dc.description.abstractPhotonic band gap fibers are proposed for the medical applications of laser light transmission into body. Conventional optical fibers guide light via total internal reflection. Due to light guiding mechanisms and materials they have limited frequency range, fiber flexibility and laser power. On the other hand, it is possible to scale operating wavelengths of PBG fibers just by changing a few parameters during fabrication process. Besides, hollow core of PBG fibers eliminates material absorptions and non-linearities during light guiding. PBG fiber production starts from material characterization; and selection; and continues with fiber design, thin film coating, preform preparation and fiber drawing. Studies on theoretical calculations and material properties have shown that best candidate materials for CO2 laser delivery are As2Se3 and poly-ethersulfone (PES). For this purpose, As2Se3 coated PES films are rolled to form a preform and consolidated before thermal drawing. Characterization of drawn fibers indicated that CO2 laser can be transmitted with loss levels of > 1 dB/m and 32 W output power is observed from a 1.2 m long fiber. After fabrication and characterization of PBG fibers, a prototype infrared laser system is built and tested on various applications. In our group laser tissue interactions are examined to see effectiveness of CO2 laser on tumor tissue. Experiments showed that tumor tissue is affected in a very distinctive way compared to healthy tissue. Absorption of cancerous lung tissue at CO2 laser wavelength (10.6 µm) is higher than absorption of healthy tissue at the same wavelength. This study proposes a wide use of PBG fiber for not just CO2 lasers, but also other laser systems used in different medical operations, such as Ho:YAG lasers. PBG fibers for high power laser delivery are novel structures for fast, painless and bloodless surgeries.en_US
dc.description.statementofresponsibilityKöylü, Özlemen_US
dc.format.extentxvii, 93 leaves, illustrationsen_US
dc.publisherBilkent Universityen_US
dc.subjectPhotonic Band Gap Fiberen_US
dc.subjectHollow-core Waveguideen_US
dc.subjectChalcogenide Glassesen_US
dc.subjectMedical Lasersen_US
dc.subjectHigh-Power Laser Beam Deliveryen_US
dc.subject.lccQC793.5.P427 K69 2011en_US
dc.subject.lcshCrystal optics.en_US
dc.subject.lcshOptical fibers.en_US
dc.subject.lcshFiber optics.en_US
dc.subject.lcshOptical communications.en_US
dc.subject.lcshHigh power lasers.en_US
dc.titlePolymer / glass hollow-core photonic band gap fibers for infrared laser beam deliveryen_US
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