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Dynamic aberration correction via spatial light modulator (SLM) for femtosecond direct laser writing

Wednesday (24.06.2020)
13:34 - 13:37 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

Femtosecond (fs) lasers are becoming a preferred tool in transparent media processing due to the possibility to induce highly localized and well-defined modification on the surface or in the volume of the material [1]. It was proven to be suitable to produce components or whole functional devices out of crystals, ceramics, glasses, polymers or working directly with living organisms in the whole meso-scale. With such versatility and capabilities there is a huge drive to transfer current know-how from experimental laboratories to industry [2].

Aberrations and associated optical distortions are one of the key issues hindering the structuring quality in high definition direct laser writing. The most troublesome being spherical aberrations. These aberrations distort the voxel shape and aspect ratio depending on the focusing depth, making structuring deep inside transparent medium challenging. The problem lies in voxel elongation and subsequent energy density decrease. This limit direct laser fabrication in terms of how deep high-precision fabrication can be carried out in the volume of transparent mediums while still maintaining acceptable and controllable writing resolution. Because spherical aberrations increase the larger the refractive index difference between the specimen and the surrounding medium it is more pronounced in high refractive index (n=2.4) materials, such as diamonds [3], or crystals with optical anisotropy (like LinBO3).

In this work, we demonstrate how a spatial light modulator (SLM) can be used to minimize aberrations when fabricating single lines in transparent medium – soda lime glass. Phase mask calculation method based on Zernike polynomials is applied. An iterative algorithm for determining the exact phase mask is discussed in detail, showing which types of aberrations (spherical, defocusing, coma) have to be accounted for and to what extent. Aberration correction is demonstrated for 100x 0.9 NA objective in sample depths up to 1 mm. We show that a combination of SLM and Zernike polynomial calculation method allows to achieve nearly spherical few μm sized voxels written in arbitrary depths of glass with a femtosecond laser.

Additional Authors:
  • Linas Jonušauskas
  • Dr. Vytautas Purlys
  • Prof. Dr. Roaldas Gadonas
  • Dr. Darius Gailevičius


Category Short file description File description File Size
Poster Version 1 This is a short manuscript to the abstract 2 MB Download
Poster Poster for display 1 MB Download