Christoph U. Keller | Christoph U. Keller

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Spatial polarization modulators: distinguishing diffraction effects from spatial polarization modulation
Self-optimizing adaptive optics control with reinforcement learning for high-contrast imaging
First light of a holographic aperture mask: Observation at the Keck OSIRIS Imager
Design of the life signature detection polarimeter LSDpol
High contrast imaging for the enhanced resolution imager and spectrometer (ERIS)
Multi-core fibre-fed integral-field unit (MCIFU): overview and first-light
Using the generalised-optical differentiation wavefront sensor for laser guide star wavefront sensing
Diffraction-limited integral-field spectroscopy for extreme adaptive optics systems with the multicore fiber-fed integral-field unit
Two Directly Imaged, Wide-orbit Giant Planets around the Young, Solar Analog TYC 8998-760-1
A universal smartphone add-on for portable spectroscopy and polarimetry: iSPEX 2
A universal smartphone add-on for portable spectroscopy and polarimetry: iSPEX 2
On-sky verification of Fast and Furious focal-plane wavefront sensing: Moving forward toward controlling the island effect at Subaru/SCExAO
Overview of focal plane wavefront sensors to correct for the Low Wind Effect on SUBARU/SCExAO
A snapshot full-Stokes spectropolarimeter for detecting life on Earth
High contrast imaging for the enhanced resolution imager and spectrometer (ERIS)
Optimization of contrast in adaptive optics for exoplanet imaging
Polarization modeling and predictions for DKIST part 2: application of the Berreman calculus to spectral polarization fringes of beamsplitters and crystal retarders
Combining angular differential imaging and accurate polarimetry with SPHERE/IRDIS to characterize young giant exoplanets
Polarization modeling and predictions for DKIST part 2: application of the Berreman calculus to spectral polarization fringes of beamsplitters and crystal retarders
Rigorous vector wave propagation for arbitrary flat media
On-sky Performance Analysis of the Vector Apodizing Phase Plate Coronagraph on MagAO/Clio2
Novel instrument concepts for characterizing directly imaged exoplanets
End-to-end simulations of the E-ELT/METIS coronagraphs
Focal-plane electric field sensing with pupil-plane holograms
FlySPEX: a flexible multi-angle spectropolarimetric sensing system
Accurate spectrally modulating polarimeters for atmospheric aerosol characterization
Instrumemtation
Mapping atmospheric aerosols with a citizen science network of smartphone spectropolarimeters
Drift scanning technique for mid-infrared background subtraction
Focal-plane wavefront sensing with high-order adaptive optics systems
Characterizing instrumental effects on polarization at a Nasmyth focus using NaCo
Fast & Furious focal-plane wavefront sensing
Spectral line polarimetry with a channeled polarimeter
Optimization-based wavefront sensorless adaptive optics for multiphoton microscopy
Calibrating a high-resolution wavefront corrector with a static focal-plane camera
Astronomical Polarimetry: Polarized Views of Stars and Planets
Semidefinite programming for model-based sensorless adaptive optics
Potential of phase-diversity for metrology of active instruments
Bilinear solution to the phase diversity problem for extended objects based on the Born approximation
Experimental validation of optimization concepts for focal-plane image processing with adaptive optics
Extremely fast focal-plane wavefront sensing for extreme adaptive optics
Linear analytical solution to the phase diversity problem for extended objects based on the Born approximation
Planetary science: In search of biosignatures
Joint optimization of phase diversity and adaptive optics: demonstration of potential
Spectropolarimeter for planetary exploration (SPEX): performance measurements with a prototype
M&m's: an error budget and performance simulator code for polarimetric systems
Prototyping for the Spectropolarimeter for Planetary EXploration (SPEX): calibration and sky measurements
The search for magnetic fields in mercury-manganese stars
EPOL: the exoplanet polarimeter for EPICS at the E-ELT
SPEX: the spectropolarimeter for planetary exploration
Spectral modulation for full linear polarimetry
SPHERE ZIMPOL: overview and performance simulation
Solar Carbon Monoxide, Thermal Profiling, and the Abundances of C, O, and Their Isotopes
Design of a polarimeter for extrasolar planetary systems characterization
High precision polarimetry with the Advanced Technology Solar Telescope
Adaptive Optics Observations of the Sun
An integrated multiangle, multispectral, and polarimetric imaging concept for aerosol remote sensing from space
Helicity and the SOLIS Vector-Spectromagnetograph
Evaluation of Seeing-Induced Cross Talk in Tip-Tilt-Corrected Solar Polarimetry
Advanced Technology Solar Telescope: a progress report
Charge caching CMOS detector for polarimetry (C$^3$Po)
High-speed cameras and solar observing
Radio Observations of the Quiet Sun
Design and development of the Advanced Technology Solar Telescope (ATST)
Low-cost solar adaptive optics in the infrared
PEPSI spectro-polarimeter for the LBT
Site testing issues for the frequency agile solar radiotelescope (FASR)
Solar polarimetry close to the diffraction limit
SOLIS: an innovative suite of synoptic instruments
Technical challenges of the Advanced Technology Solar Telescope
Helicity and the SOLIS Vector-Spectromagnetograph
Data analysis for the SOLIS Vector Spectromagnetograph
Instrumentation for astrophysical spectropolarimetry
Deconvolution of narrowband solar images using aberrations estimated from phase-diverse imagery
SOLIS: a modern facility for synoptic solar observations
Concept for a miniature solar magnetograph
Flare Genesis Experiment
Time series restoration from ground-based solar observations
Evaluation of Phase-Diversity Techniques for Solar-Image Restoration
Handling of huge multispectral image data volumes from a spectral hole burning device (SHBD)
Persistent spectral hole burning used for spectrally high-resolved imaging of the sun
Diffraction-limited slit spectrography
Zurich Imaging Stokes polarimeters I and II
Application of multiframe iterative blind deconvolution for diverse astronomical imaging
Direct Measurements of Fluxtube Inclinations in Plages