https://www.semanticscholar.org/paper/Two%E2%80%90dimensional-Wave%E2%80%90front-Tilt-Sensor-using-a-Iwata-Satoh/fdf66974032f931a1d03e24e732673914458fc6e#:~:text=A%20collimated%20wave%20reflected%20by%20a%20plane%20mirror,according%20to%20the%20tilt%20of%20the%20incident%20wave.

Two‐dimensional Wave‐front Tilt Sensor using a Two‐dimensional Transmission Grating
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FROM 49.93.69.*