Mr. Christoph Voland Profile

Christoph Voland

Opto-Electronics Engineer at European Space Agency

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Publications (7)

Proceedings Article | 11 June 2021 Open Access

Optical feeder-link between ESA’s optical ground station and Alphasat

Zoran Sodnik, Christoph Voland, Josep Perdigues, Edgar Fischer, Klaus Kudielka, Reinhard Czichy

Proceedings Volume 11852, 1185218 (2021) https://doi.org/10.1117/12.2599231

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Proceedings Article | 28 August 2019 Open Access

Demonstrating improved fibre coupling efficiency by loss-less shaping of top-hat receive beams

Ch. Voland, Y. Tissot, Th. Weigel, Th. Dreischer

Proceedings Volume 10566, 1056666 (2019) https://doi.org/10.1117/12.2551787

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Proceedings Article | 4 March 2019 Presentation + Paper

Towards optical data highways through the atmosphere

Christoph Voland, Zoran Sodnik, Josep Perdigues-Armengol, David Alaluf, Nicolas Vedrenne, Kolja Nicklaus

Proceedings Volume 10910, 109101C (2019) https://doi.org/10.1117/12.2509648

KEYWORDS: Atmospheric optics, Satellites, Free space optics, Adaptive optics, Stars, Wavelength division multiplexing, Atmospheric turbulence, Optical communications, Data communications, Satellite communications

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Proceedings Article | 21 November 2017 Open Access

Optical analysis and performance verification on ALADIN spectrometers

Laurent Francou, Elisabetta Rugi Grond, Steffen Blum, Christoph Voland

Proceedings Volume 10566, 1056624 (2017) https://doi.org/10.1117/12.2308260

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Proceedings Article | 21 November 2017 Open Access

Improving the fiber coupling efficiency for DARWIN by loss-less shaping of the receive beams

Ch. Voland, Th. Weigel, Th. Dreischer, O. Wallner, K. Ergenzinger, H. Ries, R. Jetter, A. Vosteen

Proceedings Volume 10567, 105673H (2017) https://doi.org/10.1117/12.2308041

KEYWORDS: Beam shaping, Fiber couplers, Mirrors, Wavefronts, Tolerancing, Interferometers, Solids, Planets, Optical simulations, Manufacturing

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Proceedings Article | 21 November 2017 Open Access

Laser modulator for LISA pathfinder

C. Voland, G. Lund, W. Coppoolse, P. Crosby, M. Stadler, K. Kudielka, C. Özkan

Proceedings Volume 10566, 1056613 (2017) https://doi.org/10.1117/12.2308194

KEYWORDS: Modulators, Nanoimprint lithography, Bragg cells, Electronics, Interferometers, Control systems, Space operations, Heterodyning, Laser optics, Interfaces

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LISA Pathfinder is an ESA experiment to demonstrate the key technologies needed for the LISA mission to detect gravitational waves in space. The LISA Pathfinder spacecraft represents one arm of the LISA interferometer, containing an optical metrology system and two proof masses as inertial references for the drag-free control system.

The LISA Pathfinder payload consists of two drag-free floating test masses located in the inertial sensors with their control electronics and an optical metrology subsystem. The optical metrology subsystem monitors the movement of both test masses relative to each other and to the spacecraft with very high sensitivity and resolution. This is achieved with a heterodyne Mach- Zehnder interferometer. This interferometer requires as input two coherent laser beams with a heterodyne frequency difference of a few kHz.

To generate the two laser beams with a heterodyne frequency difference a Nd:YAG laser is used together with the Laser Modulator. The Nd:YAG laser generates a single coherent laser signal at a wavelength of 1064nm which is fibre coupled to the Laser Modulator. The Laser Modulator then generates the two optical beams with the required heterodyne frequency offset. In addition, the Laser Modulator is required to perform laser amplitude stabilization and optical path difference control for the two optical signals.

The Laser Modulator consists of an optical unit – the LMU – and RF synthesiser, power amplification and control electronics. These electronics are all housed in the Laser Modulator Electronics (LME).

The LMU has four primary functions:

• Splitting of the input laser beam into two paths for later superposition in the interferometer.

• Applying different frequency shifts to each of the beams.

• Providing amplitude modulation control to each of the beams.

• Providing active control of the optical path length difference between the two optical paths.

The present paper describes the design and performance of the LMU together with a summary of the results of the Laser Modulator engineering model test campaign.

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Proceedings Article | 12 October 2015 Paper

Visible and infrared detector developments supported by the European Space Agency

N. Nelms, K. Minoglou, C. Voland, Y. Levillain, R. Meynart, J.-L. Bezy, L. Duvet, M. Zahir, B. Leone, A. Ciapponi, P.-E. Crouzet

Proceedings Volume 9639, 96390O (2015) https://doi.org/10.1117/12.2194104

KEYWORDS: Sensors, Detector development, Charge-coupled devices, Infrared detectors, Quantum efficiency, Visible radiation, Remote sensing, Readout integrated circuits, Near infrared, Infrared sensors

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