Femtosecond laser induced surface swelling in poly-methyl methacrylate.

Femtosecond laser fabrication of tubular waveguides in poly(methyl methacrylate).

Femtosecond laser direct writing is employed for the fabrication of buried tubular waveguides in bulk poly(methyl methacrylate). A novel technique using selective chemical etching is presented to resolve the two-dimensional refractive-index profile of the fabrication structures. End-to-end coupling in the waveguides reveals a near-field intensity distribution that results from the superimpositi...

Femtosecond laser written low-loss single-mode waveguides in PMMA

Ultrafast laser inscription is a standard technique to fabricate embedded waveguides in glasses or crystals. Tightly focused femtosecond laser-pulses induce an increase in refractive index inside the material via non-linear absorption. By moving the sample through the focus virtually arbitrary threedimensional paths can be created. The transfer of this technique to polymers has already delivere...

On the use of CO2 laser induced surface patterns to modify the wettability of Poly(methyl methacrylate) (PMMA)

Mechanisms of femtosecond laser- induced refractive index modification of poly(methyl methacrylate)

Publisher statement: This paper was published in Journal of the Optical Society of America B-Optical Physics and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/abstract.cfm?uri=josab-27-1-107. Systematic or multiple reproduction or distribution to multiple locations via electron...

Friction Stir Welding؛ Material Flow؛ Heat Generation؛ Thermal Simulation؛ Poly methyl methacrylate (PMMA)

In this study, the effects of linear and rotational speed of the friction stir welding tool was investigated on the heat generation and distribution at surface and inside of workpiece, material flow and geometry of the welding area of poly methyl methacrylate (PMMA) workpiece. The commercial CFD Fluent 6.4 software was used to simulation of the process with computational fluid dynamic technique...