The SXUVPS4 multi-element photo detector from Opto Diode has a 5 mm^² active area in a quadrant configuration. Designed to resist radiation damage from high-intensity UV lasers, the photodiodes are suited for laser alignment applications. Offering good stability, the devices can withstand four days of exposure to 10 eV 10¹⁶ photons/cm^² without degradation in responsivity. Responsivity is 0.125 to 0.02 A/W over a 10 to 200 nm wavelength range. The large circular detection surface is optimized for precise alignment of lasers with four elements, each offering 1.25 mm² active area. The compact TO-5 package allows for easy integration into new or existing systems.