Stuttgart 2012 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 18: Laserentwicklung: Festkörperlaser
Q 18.5: Vortrag
Montag, 12. März 2012, 17:30–17:45, V38.01
Femtosecond Written Waveguides in Pr3+:LiYF4 — •Sebastian Müller, Thomas Calmano, Philip Metz, Nils-Owe Hansen, Christian Kränkel, and Günter Huber — Institute of Laser-Physics, Hamburg, Germany
For applications in the field of integrated optics, communication and display technique, passive and active crystalline waveguides are very suitable due to their optical properties. Waveguiding in or between fs-written tracks has been successfully demonstrated in a large number of dielectric materials like crystals and glasses. Nonlinear absorption processes induced by high intensity femtosecond laser pulses lead to a distortion of a small area inside the bulk material. This distortion can result in a refractive index change and waveguiding in and around the tracks is possible. The waveguiding losses and the guided mode profile strongly depend on the writing parameters during the fabrication process. The laser material Pr3+:LiYF4 with its high absorption and emission cross sections is a well-known active medium for efficient, low threshold bulk lasers for the visible spectral region. In this work, the characteristics of Pr3+:LiYF4 waveguides with respect to the writing parameters as well as different waveguide geometries were investigated. Waveguiding inside the tracks and the unmodified regions surrounded by written claddings was successfully achieved. A characterization of the guiding losses and the guided mode profiles will be presented.