1. Univ Lyon UJM‐Saint‐Etienne CNRS Institut d Optique Graduate School Laboratoire Hubert Curien UMR 5516 Saint‐Etienne F‐42023 France
2. HID Global CID Suresnes 92150 France
3. Univ Lyon INSA Lyon Univ Claude Bernard Lyon 1 MATEIS UMR CNRS 5510 Villeurbanne F‐69621 France
4. Laser Processing Group Instituto de Optica Serrano 121 Madrid 28006 Spain