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Duijster, A. (author), Volker, A. (author), van den Berg, F. (author), Celada-Casero, C. (author)The applicability of laser ultrasonics for the determination of grain size and phase composition in steels under different temperatures was investigated. This was done by obtaining the velocity and attenuation of propagating ultrasonic waves in a simulated steel medium. Samples of ferrite and austenite with varying microstructures were modelled...article 2023
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Meuken, D. (author), van Binsbergen, S.A. (author), Scheers, L.C.W. (author), van den Berg, P.J. (author), van Eijk, A.M.J. (author)TNO has expanded its 30 kW HEL research facility with the capability to monitor specular and diffuse reflections of the laser beam. A capture screen and high-speed camera focus on dynamic specular reflections, while 15 individually placeable probes monitor the diffuse component under different angles. This paper introduces the reflection...conference paper 2022
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van Binsbergen, S.A. (author), van den Berg, P.J. (author), Scheers, L.C.W. (author), Blom, J. (author), Sucher, E. (author), van Eijk, A.M.J. (author), Stein, K. (author)Fielding TNO’s LPT (Laser Propagation Testbed) for the first time in an international trial, a 3.6 km optical propagation path was created in a maritime environment between the city of Den Helder and the island of Texel in the Netherlands. Using a 1 W, 1556 nm laser beam, atmospheric propagation was investigated by capturing the resulting beam...conference paper 2022
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Nijenhuis, J.R. (author), Jonker, W.A. (author), Kamphues, F.G. (author)TNO, in close cooperation with Demcon, has designed the Laser Projection Subsystem (LPS) for ESO’s Extremely Large Telescope (ELT). The ELT LPS will consist of up to 8 laser projection subunits. The design is based on the Four Laser Guide Star Facility (4LGSF), built for the ESO Very Large Telescope (VLT) (5). The VLT AO system has been...conference paper 2022
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Donnot, A. (author), Edmunds, J. (author), Hammond, N. (author), Welch, M. (author), Kean, P. (author), Kehayas, E. (author), Hagen, R.A.J. (author), Yadav, S. (author), Medenblik, H.J.W. (author), Cheng, L.K. (author), Bulgarini, G. (author), Dresscher, M. (author)The High Photon Efficiency (HPE) standard is a promising approach for, low Size, Weight and Power (SWaP) optical terminal for space communications. In this paper, we report the creation of a breadboard demonstrator CCSDS compliant HPE source, capable of a Pulse Position Modulation (PPM) order of 256 with an average power of 4W and kW level peak...conference paper 2022
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Pohl, R. (author), Blok, C. (author), Simmelink, K. (author), Biesheuvel, R. (author), Resink, S. (author), Nijenhuis, J.R. (author), van Riel, M.C.J.M. (author), Kamphues, F.G. (author), Calia, D.B. (author), Hackenberg, W. (author)We report on the development of a Beam Conditioning and Diagnostics System (BCDS) that will be employed in the Laser Projection System (LPS) of the Extremely Large Telescope (ELT) of ESO. This conference article provides an overview about the detailed design of the BCDS and it summarizes the work of the development phase of this project. To this...conference paper 2022
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Smirnov, Y. (author), Schmengler, L. (author), Kuik, R. (author), Repecaud, P.A. (author), Najafi, M. (author), Zhang, D. (author), Theelen, M. (author), Aydin, E. (author), Veenstra, S. (author), de Wolf, S. (author), Morales-Masis, M. (author)Sputtered transparent conducting oxides (TCOs) are widely accepted transparent electrodes for several types of high-efficiency solar cells. However, the different sputtering yield of atoms makes stoichiometric transfer of target material challenging for multi-compounds. Additionally, the high kinetic energies of the arriving species may damage...article 2021
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Paardekooper, D.M. (author), Holbrook, C. (author), L.L.A. Vosteen, , (author), Meuken, B. (author), Halswijk, W.H.C. (author), Schleijpen, H.M.A. (author)This paper will report the use of spectroscopy in a series of experiments in which a High Energy Laser (HEL) interacts with target materials. After a brief description of the 30 kW L3O laser facility at TNO, the experimental results will be discussed. The main research question is whether spectroscopy can contribute to analysing the behaviour of...conference paper 2021
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- Schleijpen, H.M.A. (author), van Binsbergen, S.A. (author), Vosteen, L.L.A. (author), de Groot-Trouw, J.C. (author), Meuken, D. (author), va Eijk, A.M.J. (author) conference paper 2021
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- Paulissen, J.J.M. (author), Meuken, D. (author), van Eijk, A.M.J. (author) conference paper 2021
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- Berzins, J. (author), Indrisiūnas, S. (author), van Erve, K. (author), Nagarajan, A. (author), Fasold, S. (author), Steinert, M. (author), Gerini, G. (author), Gecys, P. (author), Pertsch, T. (author), Bäumer, S.M.B. (author), Setzpfandt, F. (author) article 2020
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Theodorakos, I. (author), Zacharatos, F. (author), Makrygianni, M. (author), Kalaitzis, A. (author), Koritsoglou, O. (author), Ankri, J. (author), Schwarzbaum, A. (author), Melamed, A. (author), Giesbers, M. (author), Arutinov, G. (author), Tuohi, S. (author), Arnaldo, D. (author), Braz, N. (author), Geremia, R. (author), Karnakis, D. (author), Melamed, S. (author), Kabla, A. (author), de la Vega, F. (author), Kariyapperuma, D. (author), Cobb, B. (author), Price, R. (author), Too, P. (author), Norval, S. (author), Zergioti, I. (author)The recent developments in the field of large area, flexible and printed electronics have fueled substantial advancements in Laser Printing and Laser Sintering, which have been attracting interest over the past decade. Resulting applications, ranging from flexible displays and sensors, to biometric devices and healthcare, have already showcased...conference paper 2020
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Schleijpen, H.M.A. (author), van Binsbergen, S.A. (author), Geljon, M. (author), Meuken, D. (author), Deiana, D. (author)This paper will report on a first series of experiments of High Energy Laser effects on drones and drone components at TNO. After a description of the 30kW L3O laser facility at TNO, the experimental results will be discussed. The experiments were performed in an indoor facility and some considerations will be given on how to set up the...conference paper 2020
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Gevaerts, V. (author), Biezemans, A. (author), Mannetje, H. (author), Bosman, J. (author), Linden, H. (author)Monolithic interconnection technology is presented for CIGS using laser scribing and inkjet printing of dielectric and conductive inks. After deposition of all active layers of the CIGS solar cell stack a shunt-free P1 and P3 are laser scribed. A dielectric material is inkjet printed and a P2 scribe is made in between the isolated scribes. In...conference paper 2020
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Berzins, J. (author), Indrisiūnas, S. (author), Fasold, S. (author), Steinert, M. (author), Zukovskaja, O. (author), Cialla-May, D. (author), Gecys, P. (author), Bäumer, S.M.B. (author), Pertsch, T. (author), Setzpfandt, F. (author)Optically resonant high-index dielectric metasurfaces featuring Mie-type electric and magnetic resonances are usually fabricated by means of planar technologies, which limit the degrees of freedom in tunability and scalability of the fabricated systems. Therefore, we propose a complimentary post-processing technique based on ultrashort (≤ 10 ps)...article 2020
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Presvyri, S. (author), Yang, Y. (author), Hendriks, M. (author), Visser, J. (author), Hordijk, D. (author)With the recent developments in modelling the shear behaviour of reinforcement concrete (RC) members without transverse reinforcement, the contribution of aggregate interlock has been more and more recognized as one of the critical components in the shear resistance of RC members. This paper presents a study on the aggregate interlock action...conference paper 2019
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Human, J.D. (author), Liebig, T. (author), den Breeje, R. (author), Gruber, J.M. (author), Moens, T.M.N. (author), Saathof, R. (author)Multiple groups world wide are currently developing laser communication terminals for downlinking data from satellites in the LEO orbit directly to earth in the so call DTE (Direct To Earth) configuration. These terminals will require a network of ground stations to downlink their data. The challenge for the communication industry is the...other 2019
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Kuiper, S. (author), Kramer, L. (author), Siegl, M. (author), Spierdijk, J.P.F. (author), Moens, T.M.N. (author), Peters, J. (author), Oostdijck, B. (author), Crowcombe, W.E. (author)TNO’s is developing Coarse Pointing Assembly technology aimed at the needs for future laser communication systems.other 2019
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Damodaran, M. (author), Amelink, A. (author), Feroldi, F. (author), Lochocki, B. (author), Davidoiu, V. (author), de Boer, J.F. (author)Scanning laser ophthalmoscopes (SLOs) have the potential to perform high speed, high contrast, functional imaging of the human retina for diagnosis and follow-up of retinal diseases. Commercial SLOs typically use a monochromatic laser source or a superluminescent diode for imaging. Multispectral SLOs using an array of laser sources for spectral...article 2019
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Žemaitis, A. (author), Mikšys, J. (author), Gaidys, M. (author), Gecys, P. (author), Gedvilas, M. (author)Bio-inspired surfaces are able to decrease friction with fluids and gases. The most recognizable are shark-skin-like riblet surface structures. Such bio-inspired surfaces can be formed by the laser ablation technique. In this work, bio-inspired riblet surfaces with grooves were formed using picosecond ultraviolet laser ablation on pre-heated...article 2019