Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 7 of 7 for “"chirped grating"”.
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Optically Pumped Type-II Mid-Infrared Tunable Distributed Feedback Lasers
… of this type of laser, a hyperbolically chirped grating was patterned using interferometric lithography (IL) with spherical wavefronts which was then transferred into the top clad of the slab waveguide epi-structure of the laser de- vice. Wavelength tuning is achieved by translationally …
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Gratings With Multiple, Independently Apodized Layers
An index grating is a periodic perturbation of the refractive index in a waveguide's axial direction. Gratings have important roles in optical communication as spectral filters and dispersion compensators. The spectral response characteristics of gratings can be controlled by shaping the profile of …
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Integrated chirped Bragg gratings for dispersion control
… integrated device for this purpose. A monolithic chirped Bragg grating is presented with dispersion and bandwidth characteristics coinciding with the previously mentioned regimes. The device, based on a deeply etched tapered waveguide design, may be fabricated fully post-growth, lending it a …
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Fabrication and applications of fibre Bragg gratings
The consequences of fabricating Bragg gratings in various fibres, with or without hydrogen loading, and with varying laser power levels are explored. Three new techniques for fabricating chirped gratings are presented. Beams with dissimilar wavefront curvatures are interfered to give chirped …
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A theoretical study into the fundamental design limits of devices based on one-and two-dimensional structured fibres
… applications. The first technology (fibre Bragg gratings) concerns the 1-dimensional perturbation of the refractive index of an optical fibre (i.e. along the propagation axis of the fibre), whereas the second technology (microstructured optical fibres) concerns a 2-dimensional perturbation of the …
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Enhanced Spontaneous Emission And Spectral Analysis Using Waveguide Based Devices.
<p>We will put abstract in here.</p>
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Theoretical Study of Laser Beam Quality and Pulse Shaping by Volume Bragg Gratings
… and compressing of short light pulses by the chirped volume Bragg gratings (CBG) is reviewed based on spectral decomposition of short pulses and on the wavelength-dependent coupled wave equations. The analytic theory of diffraction efficiency of a CBG with constant chirp and approximate theory …