Beam shaping and in-situ diagnostics for development of transparent materials processing
Kumkar M, Zimmermann F, Kleiner J, Flamm D, Jenne M, Grossmann D, Nolte S (2018)
Publication Type: Conference contribution
Publication year: 2018
Journal
Publisher: SPIE
Book Volume: 10522
Conference Proceedings Title: Proceedings of SPIE - The International Society for Optical Engineering
Event location: San Francisco, CA, USA
ISBN: 9781510615298
DOI: 10.1117/12.2300733
Abstract
Several applications based on laser machining of transparent materials by nonlinear induced absorption of ultra short pulses are meanwhile well established. We apply in-situ diagnostics for the development auf new and improved processing techniques. The novel pump-probe system offers flexible pulse duration, burst options, beam shaping and repetition rates up to 2 MHz at an extended range of probe delay. This allows a deep inside into the spatial and temporal characteristics of nonlinear absorption and subsequent relaxation. By including effects of incubation and accumulation, mechanisms on multiple temporal and spatial scales can be addressed. This is exemplified by results achieved for ablation, welding and modification cutting by elongated beam shapes. At a probe delay in the ns-range, pressure waves can be observed. Applying fluence near threshold, a remarkable influence of accumulation on the absorption becomes obvious even at repetition rates down to 10 kHz. Increasing the repetition rate results in thermal load on a zone by far extending the initial absorption region, as can be seen by pump-probe polarization microscopy. Pump-probe diagnostics support aberration correction for improved modification cutting by Bessel-like beams. The examples on processing results highlight the achievements enabled by thorough consideration of the plurality of relevant effects.
Involved external institutions
Germany (DE)How to cite
APA:
Kumkar, M., Zimmermann, F., Kleiner, J., Flamm, D., Jenne, M., Grossmann, D., & Nolte, S. (2018). Beam shaping and in-situ diagnostics for development of transparent materials processing. In Peter R. Herman, Michel Meunier, Roberto Osellame (Eds.), Proceedings of SPIE - The International Society for Optical Engineering. San Francisco, CA, USA: SPIE.
MLA:
Kumkar, M., et al. "Beam shaping and in-situ diagnostics for development of transparent materials processing." Proceedings of the Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XVIII 2018, San Francisco, CA, USA Ed. Peter R. Herman, Michel Meunier, Roberto Osellame, SPIE, 2018.
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