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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
The surface quality of the fused silica machined by ultrafast laser
 Novotný, Jan ; Mrňa, Libor
The quality of ultrafast laser-machined surfaces depends on several process parameters. In the experiment, the parameters window that yields the lowest roughness and lowest number of defects were found. The most important parameter after laser fluence is scan line overlap, which has the biggest impact on residual heat dissipation and related stresses in the specimen. The second harmonic wavelength yielded 10 % better surface roughness, lower waviness, and a lower number of defects on the surface and edges of the processed area.
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Aplication of picosecond laser micromachinning for manufacturing of reflective DOE for CW power lasers
 Mrňa, Libor ; Novotný, Jan ; Kolařík, Vladimír
Reflective optical elements are advantageous in terms of ease of cooling, where even a less efficient element can be easily operated without damage by a simple cooling system. When material interacts with the ultrashort pulses, the interaction is largely non-thermal and the material can be removed in a very defined manner without affecting the surrounding area. Direct ablation with ultrashort laser pulses enables fast and flexible fabrication of diffractive optical elements (DOEs). Ultrashort pulses can also be used to machine difficult-to-machine materials with conventional lasers and easily create spatial structures on the order of tens of micrometers.
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