Wittrock, Ulrich
Refine
Year
- 2020 (1) (remove)
Publication Type
- Article (1) (remove)
Keywords
- laser beams (1) (remove)
We recently presented a novel unimorph deformable mirror which allows for dynamic focus shift with an actuation rate of 2 kHz. Such mirrors suffer from hysteresis and creep. Therefore, they have to be operated in closed-loop. For this purpose, we developed a defocus sensor based on an astigmatic detection system. In this paper, we present the sensor design and discuss its performance.