Optical Beam Position Detector, Analog Output, 9-mm sensor

The CONEX-PSD9 Position Sensing Detector provides accurate XY position information of laser beams and is ideally suited for laser beam stabilization, laser tracking and general beam diagnostics. Unlike quadrant detectors, the improved tetra-lateral effect diode of the CONEX-PSD9 is highly linear over the full sensor size of 9 mm x 9 mm, and delivers a third signal proportional to the beam power.

Different than many detectors that are tweaked for high bandwidth, the CONEX-PSD9 has been optimized for stability and compatibility with pulsed laser beams. An analog input filter with 319 Hz cut-off frequency suppresses high frequency noise and undesired signal ringing when used with pulsed lasers. An additional digital low pass filter can be set by software in a frequency range from 0 Hz to 1000 Hz to further improve signal homogeneity.

The 883-OH adapter allows mounting additional optics in front of the detector for stray light reduction or beam attenuation. The CONEX-PSD9 is post mountable with metric and imperial screw interfaces.


Comes with a USB cable to be used for communication and power.


To develop beam stabilization solutions for ultrafast applications, refer to the motorized mirror mounts in the supporting, related products. Note: Motorize the U100 mount with the CONEX-TRA actuator.