Publications (15)
Phase retrieval algorithm applied to high-energy ultrafast lasers
Jikai Wang, Abdolnaser Ghazagh, Sonam Smitha Ravi +6
A standardized phase retrieval algorithm is presented and applied to an industry-grade high-energy ultrashort pulsed laser to uncover its spatial phase distribution. We describe in…
Selective laser etching of displays: Closing the gap between optical simulations and fabrication
Martin Wimmer, Myriam Kaiser, Jonas Kleiner +3
Simulations and measurements on selective laser etching of display glasses are reported. By means of a holographic 3D beam splitter, ultrashort laser pulses are focused inside the…
Optical tools for laser machining along six orders of magnitude
Julian Hellstern, Christoph Tillkorn, Tim Hieronymus +3
We present an overview on the development and characterization of multiscale laser processing optics for versatile material modifications across more than six orders of magnitude.…
Coherent beam combining with micro-lens arrays
Maike Prossotowicz, Andreas Heimes, Daniel Flamm +5
A novel concept for coherent beam combining is presented based on a simple setup with microlens arrays. These standard components are used in a proof-of-principle experiment for bo…
Protecting the Edge: Ultrafast Laser Modified C-shaped Glass Edges
Daniel Flamm, Myriam Kaiser, Marvin Feil +4
A procedure and optical concept is introduced for ultrashort pulsed laser cleaving of transparent materials with tailored edges in a single pass. The procedure is based on holograp…
Dynamic focus shaping with mixed-aperture coherent beam combining
Maike Prossotowicz, Daniel Flamm, Andreas Heimes +5
A novel concept for dynamic focus shaping based on highly efficient coherent beam combining with microlens arrays (MLA) as combining element is presented. This concept allows to co…
Real-time determination of laser beam quality by modal decomposition
Oliver A. Schmidt, Christian Schulze, Daniel Flamm +4
We present a real-time method to determine the beam propagation ratio M2 of laser beams. The all-optical measurement of modal amplitudes yields M2 parameters conform to the ISO sta…
Structured light for ultrafast laser micro- and nanoprocessing
Daniel Flamm, Daniel Günther Grossmann, Marc Sailer +9
The industrial maturity of ultrashort pulsed lasers has triggered the development of a plethora of material processing strategies. Recently, the combination of these remarkable tem…
Glass tube cutting with aberration-corrected non-diffracting ultrashort laser pulses
Henning Rave, Henning Heiming, Patrick Szumny +3
The separation of complex inner and outer contours of glass articles with curved surfaces using ultrashort pulsed lasers is reported. Single-pass, full-thickness modifications alon…
Generalized axicon-based generation of nondiffracting beams
Keyou Chen, Michael Jenne, Daniel Günther Grossmann +1
We generalize the well-known method of generating nondiffracting beams based on axicons by allowing phase modulations with azimuthal dependencies. This generalization includes the…
Deep learning-driven adaptive optics for laser wavefront correction
Jikai Wang, Sven Burckhard, Sonam Smitha Ravi +4
{We report on an intensity-only and deep-learning based method for laser beam characterization that allows to predict the underlying optical field within milliseconds. A simple nea…
Beam shaping for ultrafast materials processing
Daniel Flamm, Daniel Günther Grossmann, Michael Jenne +6
The remarkable temporal properties of ultra-short pulsed lasers in combination with novel beam shaping concepts enable the development of completely new material processing strateg…
High-quality Tailored-edge Cleaving Using Aberration-corrected Bessel-like Beams
Michael Jenne, Daniel Flamm, Taofiq Ouaj +7
We report on the usage of ultrashort laser pulses in form of aberration-corrected Bessel-like beams for laser cutting of glass with bevels. Our approach foresees to incline the mat…
Focal field analysis of highly multi-mode fiber beams based on modal decomposition
Hao Pang, Tobias Haecker, Alexandre Bense +2
In this work, a numerical modal decomposition approach is applied to model the optical field of laser light after propagating through a highly multi-mode fiber. The algorithm for t…
Anamorphic beam shaping for efficient laser homogenization: methods and high power applications
Christoph Tillkorn, Andreas Heimes, Daniel Flamm +5
The homogenization of light is widely applied in various industrial sectors. The uniform high power processing of large areas requires a high degree of homogeneity. Sophisticated b…