Mo, 17.02.2020  |  15:00 Uhr
Seminar room A, R. 201
Seminar A: ATTOSEKUNDENPHYSIK

Development of a Shack-Hartmann Sensor based on adaptable diffractive lens arrays for reduction of scintillation effects

Daniel Lechner | Karlsruhe Institute of Technology, Karlsruhe, Germany

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Adaptive optics systems are used to compensate for distortions of the wavefront of light induced by turbulence in the atmosphere. Shack-Hartmann wavefront sensors are used to measure this wavefront distortion before correction. However, in turbulence conditions where strong scintillation (intensity fluctuation) is present, these sensors show considerably worse performance. This is partly because the lenslet arrays of the sensor are designed without regard to scintillation and are not adaptable to changes in turbulence strength. Therefore, we have developed an adaptable Shack-Hartmann wavefront sensor that can flexibly exchange its lenslet array by relying on diffractive lenses displayed on a spatial light modulator instead of utilizing a physical microlens array.