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dc.contributor.advisorAsokan, S
dc.contributor.authorSabapathy, Tamilarasan
dc.date.accessioned2017-11-30T17:36:37Z
dc.date.accessioned2018-07-31T06:03:29Z
dc.date.available2017-11-30T17:36:37Z
dc.date.available2018-07-31T06:03:29Z
dc.date.issued2017-11-30
dc.date.submitted2013
dc.identifier.urihttp://etd.iisc.ac.in/handle/2005/2845
dc.identifier.abstracthttp://etd.iisc.ac.in/static/etd/abstracts/3697/G26021-Abs.pdfen_US
dc.description.abstractChalcogenide glasses are highly nonlinear optical materials which can be used for fabricating active and passive photonic devices. This thesis work deals with the fabrication of buried, three dimensional, channel waveguides in chalcogenide glasses, using ultrafast laser inscription technique. The femtosecond laser pulses are focused into rare earth ions doped and undoped chalcogenide glasses, few hundred microns below from the surface to modify the physical properties such as refractive index, density, etc. These changes are made use in the fabrication of active and passive photonic waveguides which have applications in integrated optics. The first chapter provides an introduction to the fundamental aspects of femtosecond laser inscription, laser interaction with matter and chalcogenide glasses for photonic applications. The advantages and applications of chalcogenide glasses are also described. Motivation and overview of the present thesis work have been discussed at the end. The methods of chalcogenide glass preparation, waveguide fabrication and characterization of the glasses investigated are described in the second chapter. Also, the details of the experiments undertaken, namely, loss (passive insertion loss) and gain measurements (active) and nanoindentation studies are outlined. Chapter three presents a study on the effect of net fluence on waveguide formation. A heat diffusion model has been used to solve the waveguide cross-section. The waveguide formation in GeGaS chalcogenide glasses using the ultrafast laser, has been analyzed in the light of a finite element thermal diffusion model. The relation between the net fluence and waveguide cross section diameter has been verified using the experimentally measured properties and theoretically predicted values. Chapter four presents a study on waveguide fabrication on Er doped Chalcogenide glass. The active and passive characterization is done and the optimal waveguide fabrication parameters are given, along with gain properties for Er doped GeGaS glass. A C-band waveguide amplifier has been demonstrated on Chalcogenide glasses using ultrafast laser inscription technique. A study on the mechanical properties of the waveguide, undertaken using the nanoindentation technique, is presented in the fifth chapter. This work brings out the close relation between the change in mechanical properties such as elastic modulus and hardness of the material under the irradiation of ultrafast laser after the waveguide formation. Also, a threshold value of the modulus and hardness for characterizing the modes of the waveguide is suggested. Finally, the chapter six provides a summary of work undertaken and also discusses the future work to be carried out.en_US
dc.language.isoen_USen_US
dc.relation.ispartofseriesG26021en_US
dc.subjectChalcogenide Glassesen_US
dc.subjectPhotonic Devicesen_US
dc.subjectOptical Waveguidesen_US
dc.subjectChalcogenide Glass Waveguide Amplifiersen_US
dc.subjectUltrafast Laser Inscriptionen_US
dc.subjectChalcogenide Glass Waveguidesen_US
dc.subjectPhotonic Waveguidesen_US
dc.subjectFemtosecond Laser Inscriptionen_US
dc.subjectUltrafast Laser Inscribed Optical Waveguidesen_US
dc.subjectUltrafast Laser Inscribed Chalcogenide Glassesen_US
dc.subjectPhotonic Integrated Circuitsen_US
dc.subjectWaveguide Fabricationen_US
dc.subjectChalcogenide Glass Preparationen_US
dc.subjectUltrafast Laser Inscription Techniqueen_US
dc.subjectErbium Doped Optical Amplifier (EDFA)en_US
dc.subjectEr-doped Chalcogenide Glassen_US
dc.subject.classificationApplied Physicsen_US
dc.titleUltrafast Laser Inscribed Waveguides on Chalcogenide Glasses for Photonic Applicationsen_US
dc.typeThesisen_US
dc.degree.namePhDen_US
dc.degree.levelDoctoralen_US
dc.degree.disciplineFaculty of Engineeringen_US


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