Fs-Laser structuring of ridge waveguides |
| |
Authors: | D Wortmann J Gottmann |
| |
Institution: | (1) Lehrstuhl fuer Lasertechnik, RWTH Aachen University, Steinbachstr. 15, Aachen, Germany |
| |
Abstract: | Thin films made by PLD from Er:ZBLAN and Nd:Gd3Ga5O12 are micro machined to form optical wave guiding structures using Ti:sapphire and Yb:glass fiber laser radiation. For the
manufacturing of the ridge waveguides grooves are structured by ablation using femtosecond laser radiation. The fluence, the
scanning velocity, the repetition rate, and the orientation of the polarization with respect to the scanning direction are
varied. The resulting structures are characterized using optical microscopy and scanning electron microscopy. Damping and
absorption coefficients of the waveguides are determined by observing the light scattered from the waveguides due to droplets
in the thin films and the surface roughness of the structured edges. To discriminate between damping due to droplets and the
structured edges, damping measurements in the non-structured films and the structured waveguides are performed. Ridge waveguides
with non-resonant damping losses smaller than 3 dB/cm are achieved. Due to the high repetition rate of the Yb:glass fiber
laser, the manufacturing time for one waveguide has been decreased by a factor of more than 100 compared to earlier results
achieved with the Ti:sapphire laser. |
| |
Keywords: | PACS" target="_blank">PACS 42 70 Hj 42 82 Gw 81 16 Rf |
本文献已被 SpringerLink 等数据库收录! |
|