Models 2901 and 2903 quadrant-cell photoreceivers are ideal when you need to measure deviations in the position or pointing of your laser beam, such as that required in beam-stabilization systems. Quadrant-cell photoreceivers consist of four individual yet identical photocells positioned very close to each other (100-µm gaps). To increase the sensitivity of these photoreceivers, each of the cells’ photocurrents is sent to its own individual amplifier before being processed with the other photocell signals to generate top-minus-bottom difference (vertical error) and right-minus-left difference (horizontal error) signals. A sum-of-all-quadrants signal is also provided for normalization purposes. Models 2901 and 2903 have analog output.

The 2901 and 2903 quadrant-cell photo-receivers can run off batteries or your own DC power supply. To ensure low noise operation, we strongly recommend our Model 0901 power supply.Optical accessories, such as filter holders for bandpass and neutral-density filters, can be attached to the front of these photoreceivers for filtering out unwanted light or attenuating your beam.




Applications