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2009

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Articles 61 - 63 of 63

Full-Text Articles in Optics

Nonlinear Femtosecond Near Infrared Laser Structuring In Oxide Glasses, Arnaud Royon Jan 2009

Nonlinear Femtosecond Near Infrared Laser Structuring In Oxide Glasses, Arnaud Royon

Electronic Theses and Dissertations

Three-dimensional femtosecond laser structuring has a growing interest because of its ease of implementation and the numerous possible applications in the domain of photonic components. Structures such as waveguides, diffraction gratings, optical memories or photonic crystals can be fabricated thanks to this technique. Its use with oxide glasses is promising because of several advantages; they are resistant to flux and ageing, their chemical composition can easily be changed to fit the well-defined requirements of an application. They can already be found in Raman amplifiers, optical fibers, fiber lasers, and other devices. This thesis is based on two axes. The first …


Design And Fabrication Of Space Variant Micro Optical Elements, Pradeep Srinivasan Jan 2009

Design And Fabrication Of Space Variant Micro Optical Elements, Pradeep Srinivasan

Electronic Theses and Dissertations

A wide range of applications currently utilize conventional optical elements to individually transform the phase, polarization, and spectral transmission/reflection of the incident radiation to realize the desired system level function. The material properties and the feasibility of fabrication primarily impact the device and system functionality that can be realized. With the advancement in micro/nano patterning, growth, deposition and etching technology, devices with novel and multiplexed optical functionalities have become feasible. As a result, it has become possible to engineer the device response in the near and far field by controlling the phase, polarization or spectral response at the micro scale. …


Femtosecond Laser Written Volumetric Diffractive Optical Elements And Their Applications, Jiyeon Choi Jan 2009

Femtosecond Laser Written Volumetric Diffractive Optical Elements And Their Applications, Jiyeon Choi

Electronic Theses and Dissertations

Since the first demonstration of femtosecond laser written waveguides in 1996, femtosecond laser direct writing (FLDW) has been providing a versatile means to fabricate embedded 3-D microstructures in transparent materials. The key mechanisms are nonlinear absorption processes that occur when a laser beam is tightly focused into a material and the intensity of the focused beam reaches the range creating enough free electrons to induce structural modification. One of the most useful features that can be exploited in fabricating photonic structures is the refractive index change which results from the localized energy deposition. The laser processing system for FLDW can …