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Conference Papers Year : 2011

Multipoint focusing of single ultrafast laser pulses


Designing laser spot forms can significantly increase the versatility of ultrafast laser pulses for 3D processing of transparent material. Apodization functions were used to control both the geometry of interaction and the length of processing (i.e. non-diffractive approaches). Parallel photoinscription approaches were equally tested to significantly increase the processing efficiency, using the key feature of a higher number of simultaneous machining points by spatial phase engineering. We present here a particular photoinscription regime where an axial array of regular dots is generated before the region of main laser focus under single pulse exposure in fused silica (Fig. 1) and borosilicate crown glass. Although the interaction takes place with powers above the self-focusing level, the specific topology of the dots does not rely on nonlinear propagation effects but is mainly determined by beam truncation. The process is explained by a Fresnel propagation formalism taking into account beam apodization and linear wavefront distortions at the air/glass interface. The array matrix can be controlled by the truncation factor and the focusing length. This photoinscription regime is employed to generate two-dimensional arrays of dots in fused silica. We show that an additional phase modulation renders flexible the pattern geometry. In addition we indicate that the pulse temporal envelope can efficiently control the form factor of laser generated individual dots.


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Dates and versions

ujm-00677309 , version 1 (07-03-2012)


  • HAL Id : ujm-00677309 , version 1


Cyril Mauclair, Alexandre Mermillod-Blondin, Arkadi Rosenfeld, Isamu Miyamoto, Eric Audouard, et al.. Multipoint focusing of single ultrafast laser pulses. Laser Precision Microfabrication, Jun 2011, Takamatsu, Japan. ⟨ujm-00677309⟩
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