Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 30: Photonics 2

Q 30.4: Vortrag

Mittwoch, 16. März 2011, 11:15–11:30, SCH A118

Femtosecond Induced Optical Elements In Fused Silica — •Janning Herrmann, Wolfgang Horn, and Cornelia Denz — Institut für Angewandte Physik, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany

Optical waveguides and large-scale integrated photonic devices, such as couplers, splitters, amplifiers and add-drop multiplexers are of increasing interest for today's high speed optical networks. One of the most attractive fabrication techniques for these devices is point-by-point ultra-fast laser writing of photonic structures that permit rapid prototyping by multiphoton absorption in otherwise nonphotosensitive technical glasses. Femtosecond induced refractive index modifications are long term stable, have true 3D capability, and exhibit a higher degree of freedom for the design of integrated photonic circuits compared to traditional procedures like mask-based lithography. We demonstrate writing of diffractive optical elements, single-mode waveguide couplers, three-dimensional splitters, and Mach-Zehnder interferometers. Fabricated prototypes are fiber-coupled to lightwave circuits to determine mode confinement and loss characteristics. We also produced waveguides with integrated Bragg-gratings for narrowband multichannel filters in the telecom waveband and characterized their reflection and transmission properties. The used point-by-point writing techniques allows to easily induce defects that break the symmetry of the lattice. Therefore, magnitude and phase response of the filter transfer function can be customized to achieve tailored phase modification of propagating signals.