Speaker
Description
For ET-LF we develop a phase camera based on multi-mode optical fiber as image sensor to simultaneously map the phase and amplitude wavefronts of each sideband. Mode-mismatch and beam distortions can then be individually characterized by a CNN driven mode decomposition in real-time. The implementation of the cost-efficient TARGET ASIC digitizer developed the SST Camera of CTAO allows to equip high pixel numbers at the necessary sampling speeds of >500MSa/s. Our target is a sensor of size 64 x 64 pixel to monitor at frame rates up to 400Hz. This enables bridging the gap between fast but low resolution quad-photodiodes and slow high-resolution solutions. A proof-of-concept 1D 56-pixel version of the camera was successfully commissioned at the ET-Pathfinder. The corresponding phase and amplitude noise of the signal chain is well-understood.