Position sensitive detectors. Spatially-resolved photodiodes measure the position of a light spot. The bandwidth and resolution of so-called position sensitive detectors (PSDs) are unmatched.
A one dimensional PSD makes continuous detection of the position of a laser spot along one axis possible. It possesses three contacts. Customized PSDs available.
A two dimensional PSD makes continuous detection of the position of a laser spot along two axes possible. It possesses four contacts. Customized versions available.
Thanks to the small areas of the individual segments differential diodes are well suited for high resolution and fast position measurements.