The nature of transparent materials makes their laser-based functionalisation more complex, highly material dependant and often characterised by process throughputs too low to be considered competitive for an industrial uptake. In this frame, direct laser interference patterning (DLIP) appears to be the right compromise to achieve 100s-nm surface features while running at competitive throughputs. A state-of-the-art DLIP processing setup is employed to shape the 100s-nm nanostructure features to obtain highly homogeneous morphologies in different regimes of interaction on polycarbonate, fused silica and sapphire, including a DLIP-tailored f-theta lens connected to a 30-mm aperture high-speed galvanometric scanning head.
Volume Bragg Gratings (VBG) are inscribed in the bulk of non-conventional photosensitive glasses tailored with silver by means of femtosecond laser irradiation. Thanks to intrinsic features of the spatial distribution of silver-sustained inscribed structures, it is possible to fabricate gratings with sub-wavelength periodic refractive index modulation. As a result, the achieved VBG target first-order Bragg reflection in the VIS - NIR spectral range. This work paves the way to manufacturing more complex optical devices, such as Waveguide Bragg Gratings.
We report on our very recent demonstration of new waveguide Bragg gratings inscribed in a silver-containing oxide phosphate glass. We present the mask-less fabrication of first-order Bragg grating in the red/near-IR range. Based on coupled mode theory, these waveguide Bragg gratings show strong coupling constants, up to 3.9 mm-1 depending of the chosen Bragg grating geometry, which is relevant for applicative perspectives in integrated optics. Detailed description of these silver-sustained waveguide Bragg gratings will be provided, allowing for discussing both limitations and potentialities of the proposed innovative approach for the production of Bragg gratings in such photosensitive glasses.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.