High power picosecond laser system
Final Report Abstract
The acquired high power picosecond laser system with harmonic and burst option modules has been a primary tool for a number of research and development projects. Its average use is estimated to approach 40 hours per week on an annual basis contributing to the following research programs: • DFG priority program SPP 1327 “Optisch erzeugte Sub-100nm Strukturen für biomedizinische und technische Applikationen”. The objective of the research is to develop a flexible laser based technology to produce structures below the classical optical diffraction limit - down to sub 100 nm with possible applications being biological cell surgery, high resolution hologram fabrication. • Two research projects within the BMBF sponsored cluster “Medical Valley” in cooperation with an industrial partner. The projects focused on development of novel fabrication technique for intraocular lenses based on ultrafast laser machining of biocompatible polymers. The developed method of ultrafast laser lens cutting has been adopted by an industrial partner to be used as a part of the lens production process. • Industry sponsored investigations on the subject of material structuring with a high average power picosecond laser with the targeted objectives to increase material ablation rates (productivity) and to incorporate computer numerical control (CNC) into the machining process. • Ultrafast laser processing of glass materials primarily in-depth investigation of nonlinear laser welding of glass. • The laser is expected to be extensively used in the future for the above mentioned programs as well as for the DFG sponsored project “Trockenumformung mit lokal angepassten tribologischen Bedingungen ” within SPP 1676 starting in 2014.
Publications
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"Sample preparation method for glass welding by ultrashort laser pulses yields higher seam strength". Appl. Opt. 50, No.13, May 1st , pp. 1941-1944 (2011)
K. Cvecek, I. Miyamoto, J. Strauss, M. Wolf, T. Frick, and M. Schmidt
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“Characteristics of laser absorption and welding in FOTURAN glass by ultrashort laser pulses”. Optics Express, Vol. 19, Issue 23, pp. 22961-22973 (2011)
I. Miyamoto,. K. Cvecek, Y. Okamoto, M. Schmidt and H. Helvajian
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“Evaluation of nonlinear absorptivity in internal modification of bulk glass by ultrashort laser pulses”. Optics Express, Vol. 19, Issue 11, pp. 10714-10727 (2011)
I. Miyamoto, K. Cvecek and M. Schmidt
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Strengh of Joining Seams in Glass Welded by Ultra-fast Lasers Depending on Focus Height. JLMN-Journal of Laser Micro/Nanoengineering, Vol. 39, No. 1, pp. 68-72, 2012
Cvecek, K.; Miyamoto, I.; Strauß, J.; Bui, V.; Scharfenberg, S.; Frick, T.; Schmidt, M.
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“Characterization of Shear Strength and Bonding Energy of Laser Pro-duced Welding Seams in Glass”. JLMN-Journal of Laser Micro/Nanoengineering, Vol. 39, No. 3, 2012
I. Alexeev, K. Cvecek, C. Schmidt , I. Miyamoto, T. Frick, M. Schmidt
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“Toner-Print Removal from Paper by Long and Ultrashort Pulsed Lasers”. Proceedings of the Royal Society A (2012)
D. Leal-Ayala, J. Allwood, M. Schmidt, I. Alexeev
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"Laser focus positioning method with submicrometer accuracy". Appl. Opt. 52, No.3, January 16th , pp. 415-421 (2013)
I. Alexeev, J. Strauss, A. Gröschl, K. Cvecek and M. Schmidt
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Microstructuring Tools for Sheet Bulk Metal Forming - A Designated Application for Picosecond Laser. JLMN-Journal of Laser Micro/Nanoengineering Vol. 8, No. 1, January 2013, pp. 39 - 44
Häfner, T.; Reg, Y.; Hetzner, H.; Schmidt, M.
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Ultrafast Laser Surface Structuring of Intraocular Lens Polymers. JLMN - Journal of Laser Micro / Nanoengineering, Vol. 8, No. 1, pp. 5155 (2013)
Heberle, J.; Klämpfl, F.; Alexeev, I.; Schmidt, M.
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“Determination of the Effective Refractive Index of Nanoparticulate ITO Layers”. Optics Express, Vol. 21, Issue 19, pp. 22754-22761 (2013)
M. Baum, I. Alexeev, M. Latzel, S. H. Christiansen, and M. Schmidt
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“Practical aspects of surface generated third harmonic for highly precise beam-workpiece alignment”. JLMN-Journal of Laser Micro/Nanoengineering Vol. 8, No. 3, 2013, 201-205
Cvecek, K.; Strauss, J.; Alexeev, I.; Miyamoto, I.; Schmidt, M.
