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© JMDThèque - 2013

- Surfaces modifications by laser photo-ablative processes with material removal or not (annealing). High spatial resolution (few micrometers in depth).

- Surfaces photo-treatments (spatial resolution ~ 2-3 µm) with pre-ablative and ablative laser intensities (application in biology and medicine).

- Micro-drillings on hard/soft, organic/inorganic materials (microfluidic or other microtechnology).

- Laser micro-machining of micro-items with global dimension less than 1 cm. Cutting accuracy ~ 2-3 µm.

- Molecular etching of surfaces (no substrate damage) by laser ablation to remove a coating or an oxide layer : paints, varnishes, lacquers, … This technique can be applied to the conservation/restorationof historic monuments.

Aimed specific applications :

  

The laser micro-machining allows to create patterns whose dimensions and accuracy are on a scale of micron. There are 3 main lasers types :


- Infrared lasers (IR), for which the interaction with the substrate is thermal, provide a high-speed machining. The thickness brings into play at each laser pulse varies from few microns to few millimeters

- Ultraviolet lasers (UV), for which the interaction with organic/biological materials is based on photo-ablative processes. The sample thickness brings into play at each laser pulse is micrometric. In this case, the micro-machining is slow. In return, ultraviolet wavelengths allow to access to a better resolution than infrared wavelengths power densities between 1 and 100 GW/cm²)

- Short-pulse lasers (picosecond) and ultra-short pulse lasers (femtosecond) for which the laser pulse brevity minimizes thermal effects (high-accuracy machining, particularly adapted to the construction of  patterns from 10 µm to 1 mm, with a spatial resolution of 1 µm. The thickness brings into play at each laser pulse is micrometric. The narrow pulse brevity can reach power densities between 1 and 100 TW/cm².


Among fiber lasers advantages, we can cite:


- the high quality of their beam
- their monolithic construction minimizing opto-mechanical adjustments to be made
- their high output powers
- their compactness
- their high output efficiency and low energy consumption
- the long life expectancy of their pump diodes

  

Development of a Laser Micro-Machining Platform

  

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