Holographic wavefront sensor for fast defocus measurement
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Andreas Zepp
Andreas Zepp graduated in 2005 in Laser Engineering at the University of Applied Sciences Koblenz, Germany. After receiving his MSc degree in Applied Physics, he worked at Fraunhofer FIT in the Biomolecular Optical Systems group (BioMOS) in Sankt Augustin. In 2011, he joined the Adaptive Optics group at Fraunhofer IOSB in Ettlingen, Germany. His research interests are in adaptive optics, optical metrology, analog and digital holography.
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Szymon Gładysz
Szymon Gładysz obtained his MSc in Industrial Engineering from Wroclaw University of Technology, Poland, and a PhD in Physics from the National University of Ireland, Galway. He worked as a postdoctoral researcher at NUI, Galway, at the European Southern Observatory, Garching bei München, Germany, and at Israel Institute of Technology (Technion) in Haifa. He is currently the Head of the Adaptive Optics Group at Fraunhofer IOSB. His research interests are in adaptive optics, theoretical aspects of light propagation through horizontal-path turbulence, image processing, and speckle statistics.
Karin Stein is the Head of the Department ‘Signatorics’ at Fraunhofer IOSB. She has been with the Institute (then named FGAN-FfO) since 1991. She obtained her Diploma in Physics and PhD in the field of laser-plasma interaction both from Technical University Darmstadt, Germany. Since 2003, she has been the conference chair of ‘Atmospheric Propagation and Adaptive Systems’ at SPIE Remote Sensing Europe. Since 2009, she has been in charge of the organization of all SPIE Remote Sensing symposiums as a co-chair, and since 2011 as the chair. Her research interests are in meteorology, impact of atmosphere on imaging systems, warning sensor technology, and remote sensing.
Abstract
Atmospheric effects significantly influence the propagation of light. Conventional adaptive optics systems, based on Shack-Hartmann sensors (SHS), work well for vertical-path propagation. However, for more challenging scenarios like horizontal-path imaging or free-space laser communications through extended-volume turbulence and strong scintillation, the bandwidth of SHS is insufficient. A promising alternative is the holographic wavefront sensor (HWFS). Our paper deals with some dependencies and limitations of the HWFS. First, we show that the sensitivity of the HWFS is highly dependent on the detector size. The smaller the detector, the more sensitive is the sensor. This has consequences in the photon-starved regime, which would naturally occur when the sensor is operated at the intended MHz speed. Second, we show that uncorrected (or residual) tip/tilt has a large impact on the accuracy of the measurement. We present experimental results of measuring an important and also easily correctable aberration, defocus, with the HWFS.
About the authors
Andreas Zepp graduated in 2005 in Laser Engineering at the University of Applied Sciences Koblenz, Germany. After receiving his MSc degree in Applied Physics, he worked at Fraunhofer FIT in the Biomolecular Optical Systems group (BioMOS) in Sankt Augustin. In 2011, he joined the Adaptive Optics group at Fraunhofer IOSB in Ettlingen, Germany. His research interests are in adaptive optics, optical metrology, analog and digital holography.
Szymon Gładysz obtained his MSc in Industrial Engineering from Wroclaw University of Technology, Poland, and a PhD in Physics from the National University of Ireland, Galway. He worked as a postdoctoral researcher at NUI, Galway, at the European Southern Observatory, Garching bei München, Germany, and at Israel Institute of Technology (Technion) in Haifa. He is currently the Head of the Adaptive Optics Group at Fraunhofer IOSB. His research interests are in adaptive optics, theoretical aspects of light propagation through horizontal-path turbulence, image processing, and speckle statistics.
Karin Stein is the Head of the Department ‘Signatorics’ at Fraunhofer IOSB. She has been with the Institute (then named FGAN-FfO) since 1991. She obtained her Diploma in Physics and PhD in the field of laser-plasma interaction both from Technical University Darmstadt, Germany. Since 2003, she has been the conference chair of ‘Atmospheric Propagation and Adaptive Systems’ at SPIE Remote Sensing Europe. Since 2009, she has been in charge of the organization of all SPIE Remote Sensing symposiums as a co-chair, and since 2011 as the chair. Her research interests are in meteorology, impact of atmosphere on imaging systems, warning sensor technology, and remote sensing.
The research is sponsored by BAAINBw/WTD91.
References
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©2013 by THOSS Media & De Gruyter Berlin Boston
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Articles in the same Issue
- Masthead
- Masthead
- Views
- State of photonics-related industry in Japan: Digital economy is creating a deep integration in East Asia
- Transferring diffractive optics from research to commercial applications: Part I – progress in the patent landscape
- Community
- News from the European Optical Society
- Conference Notes
- Conference Calendar
- Topical Issue: Remote Sensing
- Editorial
- Remote sensing
- Tutorial
- Speckle effects in target-in-the-loop laser beam projection systems
- Review Articles
- Laser gated viewing at ISL for vision through smoke, active polarimetry, and 3D imaging in NIR and SWIR wavelength bands
- Infrared detectors for space applications
- Research Article
- Alternative design for extremely large telescopes and options to use the VATT for ELT design demonstration
- Letters
- Holographic wavefront sensor for fast defocus measurement
- Beam combining of quantum cascade lasers for remote sensing
- Review Article
- Design of freeform optics
- Research Article
- NIR cutoff filter for true color imaging sensors
