Issue 40, 2008
From the journal:

Physical Chemistry Chemical Physics

Femtosecond laser processing of biopolymers at high repetition rate

Solenne Gaspard,a   Magdalena Forster,b   Christoph Huber,b   Christian Zafiu,b   Günter Trettenhahn,b   Wolfgang Kautekb  and  Marta Castillejo*a  

* Corresponding authors

a Instituto de Química Física Rocasolano, CSIC, Serrano 119, Madrid, Spain
E-mail: marta.castillejo@iqfr.csic.es
Fax: +34 91 5642431
Tel: +34 91 5619400

b University of Vienna, Department of Physical Chemistry, Waehringer Strasse 42, Vienna, Austria

Abstract

The large intensities available with femtosecond (fs) laser pulses allow permanent structural modifications in transparent materials with high spatial resolution. Irradiation of self-standing transparent biopolymer films, such as collagen, pure and curcumin doped gelatine employing a 60-fs high-power 11 MHz Ti-Sapphire oscillator laser system linked to an optical microscope led to modifications and ablation. Swelling modifications consisting in the foaming of the irradiated area and formation of a single layer of bubbles arranged around the narrow ablation crater were investigated by optical, scanning force (SFM) and scanning electron (SEM) microscopy. These modifications occur at fluences below the respective ablation thresholds, i.e. ablation processes take place on modified swelled phases. The results are discussed in terms of local temperature increase, generation of thermoelastic stress, physico-chemical effects, and in terms of an incubation model, i.e. the accumulation of these phenomena upon successive pulse irradiation.

Graphical abstract: Femtosecond laser processing of biopolymers at high repetition rate

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Article information

DOI
https://doi.org/10.1039/B807870J
Article type
Paper
Submitted
09 May 2008
Accepted
03 Jul 2008
First published
26 Aug 2008

Phys. Chem. Chem. Phys., 2008,10, 6174-6181

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Femtosecond laser processing of biopolymers at high repetition rate

S. Gaspard, M. Forster, C. Huber, C. Zafiu, G. Trettenhahn, W. Kautek and M. Castillejo, Phys. Chem. Chem. Phys., 2008, 10, 6174 DOI: 10.1039/B807870J

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