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Laser material processing with a multi-beam setup based on Excited State Absorption

Wednesday (24.06.2020)
13:46 - 13:49 Room 1
Part of:
- Poster Periodic microstructuring of metal moulds using direct laser interference patterning for nanoimprint replication 1 Dr. Marcos Soldera
- Poster Comparison of structural colors achieved by laser induced periodic surface structures and direct laser interference patterning 1 Dr. Marcos Soldera
- Poster *student* Wetting properties of the aluminium surface structures fabricated using Direct Laser Interference Patterning with picosecond and femtosecond pulses 1 Dipl.-Ing. Stephan Milles
- Poster The numerical realization of a model of interaction of ultrashort laser pulses with solid 1 Prof. Vladimir Zhukov
- Poster On the problem of the initial conditions for tightly-focused ultrashort laser pulses in the modeling of laser beam propagation in transparent solids 1 Prof. Vladimir Zhukov
- Poster Innovative polymer coating systems – applied by laser sintering technique 1 Dr. Anna Buling
- Poster Tangential laser turning of fused silica usin ultra-short laser pulses 1 Julian Zettl
- Poster Process optimization of Direct Laser Interference Patterning 1 Dr. Bogdan Voisiat
- Poster Dynamic aberration correction via spatial light modulator (SLM) for femtosecond direct laser writing 1 Gabrielius Kontenis
- Poster Modification of metal nanoparticles via femtosecond laser pulses and their application for SERS 1 Dr. Asta Tamuleviciene
- Poster Ultraviolet and Infrared Femtosecond Laser Irradiation of Thermoplastics PET and PA66 1 Dr. Xxx Sedao
- Poster High pulse energy femtosecond laser machining station for the interference and parallel processing 1 Dr. Simonas Indrisiunas
- Poster Laser material processing with a multi-beam setup based on Excited State Absorption 1 Sebastian Engel
- Poster GO-neutral red nanocomposite reduction by pulsed laser irradiation 1 Dr. Romualdas Trusovas
- Poster *student* Numerical simulation of energy relaxation in Mo thin films exposed to femtosecond laser pulse 1 Kryštof Hlinomaz
- Poster Modification of medical-grade poly(L-lactide) using femtosecond laser filamentation 1 Dr. Bogusz Stepak
Session Chair

Session PS: Poster Session 02
Belongs to:
Topic PS: Poster Session

The continued drive towards ever smaller structures requires novel processing techniques that overcome the Abbe limit to open up future applications, e.g., in the fields of photonics and microelectronics [1-3]. Structures with lateral dimensions up to several tens of a nanometer are already realized by means of various photonic processes including multiphoton absorption, intensity threshold processes, and photolithography [4-6]. The present work deals with an alternative, novel technique of sub-diffraction direct laser writing based on a combination of Stimulated Emission Depletion (STED) with the effect of an Excited State Absorption (ESA) that allows the generation of structural sizes in the sub-wavelength range on optically active materials. Analogous to STED-microscopy, this approach creates an excited spatial volume below the diffraction limit. The modified optical properties of this volume compared to the non-excited surrounding regions are used for the subsequent spatially restricted material processing based on an ESA. We present the basic principles of the novel method and show first results of the material modification (e.g., in the form of ablation) solely induced by an ESA, whereby the individual fluences of both the pump- and the ESA-laser pulses are below the respective ablation thresholds. For this purpose, two (ultra-) short laser pulses were spatially superimposed to each other as shown in Figure 1(a). The interaction with an optically active layer deposited on an optically transparent substrate was studied in dependence on the pulse delay (Figure 1(b)). The fabrication of structures (spots and lines) were investigated as a function of versatile parameters including laser wavelength, pulse fluence, pulse delay, substrate material, and laser pulse number.

Sebastian Engel
Friedrich Schiller University Jena
Additional Authors:
  • Christoph Wenisch
    FSU Jena
  • Dr. Stephan Gräf
    FSU Jena
  • Prof. Dr. Frank Müller
    FSU Jena


Category Short file description File description File Size
Extended Abstract Version 1 This is a short manuscript to the abstract 307 KB Download
Poster Laser material processing with a multi-beam setup based on Excited State Absorption 1 MB Download