Mr. André Löscher Profile

André Löscher

at Univ Stuttgart

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Author

Publications (9)

Proceedings Article | 20 June 2024 Presentation

Highly flexible, kilowatt-class thin-disk multipass amplifier and its applications in material processing

Marwan Abdou Ahmed, André Löscher, Florian Bienert, Thomas Graf

Proceedings Volume PC13005, PC1300502 (2024) https://doi.org/10.1117/12.3021122

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Proceedings Article | 12 March 2024 Presentation + Paper

Fast switchable CW to ultrashort pulsed high-power laser beam from a single thin-disk multipass amplifier

Christian Schmittner, André Loescher, Colin Reiff, Thomas Graf, Marwan Abdou Ahmed

Proceedings Volume 12864, 128640B (2024) https://doi.org/10.1117/12.2691163

KEYWORDS: Pulsed laser operation, Pulsed power, Disk lasers, Laser amplifiers, Flexible manufacturing, Continuous wave operation, Laser radiation, Laser processing, Switching, High power lasers, Laser systems engineering

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Proceedings Article | 11 June 2021 Open Access

The Copernicus CO2M mission for monitoring anthropogenic carbon dioxide emissions from space

Bernd Sierk, Valerie Fernandez, J.-L. Bézy, Y. Meijer, Y. Durand, G. Bazalgette Courrèges-Lacoste, C. Pachot, A. Löscher, H. Nett, K. Minoglou, L. Boucher, R. Windpassinger, A. Pasquet, D. Serre, F. te Hennepe

Proceedings Volume 11852, 118523M (2021) https://doi.org/10.1117/12.2599613

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The European Space Agency (ESA), in collaboration with the European Commission (EC) and EUMETSAT, is developing a space-borne observing system for quantification of anthropogenic carbon dioxide (CO2) emissions. Forming part of the EC's Copernicus programme, the CO2 monitoring (CO2M) mission will be implemented as a constellation of identical satellites, to be operated over a period > 7 years and measuring CO2 concentration in terms of column-averaged mole fraction (denoted as XCO2). Each satellite will continuously image XCO2 along the satellite track on the sun-illuminated part of the orbit, with a swath width of >250 km. Observations will be provided at a spatial resolution < 2 x 2 km2 near the swath center, with high precision (<0.7 ppm) and accuracy (bias <0.5 ppm). To this end, the payload comprises a suite of instruments addressing the various aspects of the challenging observation requirements: A push-broom imaging spectrometer will perform co-located measurements of top-of-atmosphere radiances in the Near Infrared (NIR) and Short-Wave Infrared (SWIR) at high to moderate spectral resolution (NIR: 747-773nm@0.1nm, SWIR-1: 1595-1675nm@0.3nm, SWIR-2: 1990-2095nm@0.35nm). These observations are complemented by measurements in the visible spectral range (405-490 nm@0.6nm), providing vertical column measurements of nitrogen dioxide (NO2) that serve as a tracer to assist the detection of fossil-fuel emission plumes (e.g. from coal-fired power plants and cities). High quality retrievals of XCO2 will be ensured even over polluted industrial regions, thanks to co-located measurements of aerosols performed by a Multiple-Angle Polarimeter (MAP). Finally, measurements of a three-band Cloud Imager, co-registered with the CO2 observations, will provide the required cloud-flagging capacity at sub-sample level (<200m resolution). The presentation will review the results of the Phase A/B1 instrument studies carried out in 2018-2019, including technology pre-development activities, and highlight the identified engineering challenges. The preliminary design of the CO2M mission’s instruments at the beginning of the implementation phase will be presented, along with an outlook on the development activities under the Phase B2CD programme.

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SPIE Journal Paper | 11 September 2019 Open Access

Ultrafast thin-disk multipass laser amplifier scheme avoiding misalignment induced by natural convection of the ambient air

Christoph Röcker, Jan-Philipp Negel, André Loescher, Tom Dietrich, Stefan Piehler, Benjamin Dannecker, Thomas Graf, Marwan Abdou Ahmed

OE, Vol. 58, Issue 09, 096102, (September 2019) https://doi.org/10.1117/12.10.1117/1.OE.58.9.096102

KEYWORDS: Mirrors, Optical amplifiers, Convection, Laser crystals, Laser amplifiers, Ultrafast phenomena, Disk lasers, Optical engineering, Solids, Optical simulations

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Proceedings Article | 25 September 2017 Open Access

Carbonsat instrument pre- developments: towards monitoring carbon dioxide and methane concentrations from space

B. Sierk, A. Löscher, J. Caron, J.-L. Bézy, Y. Meijer

Proceedings Volume 10562, 105622C (2017) https://doi.org/10.1117/12.2296198

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Proceedings Article | 27 April 2016 Paper

Thin-disk multipass amplifier emitting radially polarized beam with 635 W of average power and 2.1 mJ of pulse energy

André Loescher, Jan-Philipp Negel, Thomas Graf, Marwan Abdou Ahmed

Proceedings Volume 9893, 98930N (2016) https://doi.org/10.1117/12.2228110

KEYWORDS: Optical amplifiers, Pulsed laser operation, Polarization, Ultrafast lasers, Picosecond phenomena, Phase shifts, Optical components, Beam shaping, Amplifiers, Laser crystals, Beam propagation method, Polarizers

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Proceedings Article | 26 March 2015 Paper

Ultrafast thin-disk multipass amplifier with 1.4 kW average power and 4.7 mJ pulse energy at 1030 nm converted to 820 W and 2.7 mJ at 515 nm

Jan-Philipp Negel, André Löscher, Andreas Voss, Dominik Bauer, Dirk Sutter, Alexander Killi, Marwan Abdou Ahmed, Thomas Graf

Proceedings Volume 9342, 93420V (2015) https://doi.org/10.1117/12.2079007

KEYWORDS: Mirrors, Optical amplifiers, Amplifiers, Picosecond phenomena, Head, Infrared telescopes, Ultrafast lasers, Ultraviolet radiation, Ultrafast phenomena, Crystals

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Proceedings Article | 4 March 2015 Paper

Efficient processing of CFRP with a picosecond laser with up to 1.4 kW average power

V. Onuseit, C. Freitag, M. Wiedenmann, R. Weber, Jan-Philipp Negel, André Löscher, M. Abdou Ahmed, T. Graf

Proceedings Volume 9350, 935012 (2015) https://doi.org/10.1117/12.2077457

KEYWORDS: Laser cutting, Laser processing, Carbon, Picosecond phenomena, Laser systems engineering, Pulsed laser operation, Laser applications, Laser ablation, Manufacturing, Fiber lasers

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Proceedings Article | 20 February 2015 Paper

High-power Yb:YAG single-crystal fiber amplifiers for femtosecond lasers

Fabien Lesparre, Igor Martial, Julien Didierjean, Jean Thomas Gomes, Wolfgang Pallmann, Bojan Resan, André Loescher, Jan-Phillipp Negel, Thomas Graf, Marwan Abdou Ahmed, François Balembois, Patrick Georges

Proceedings Volume 9342, 934203 (2015) https://doi.org/10.1117/12.2079045

KEYWORDS: Polarization, Fiber amplifiers, Amplifiers, Optical amplifiers, Femtosecond phenomena, Crystals, Oscillators, Wave plates, Laser crystals, Mirrors

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Showing 5 of 9 publications

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