ELECTROMAGNETIC WAVE DETECTION

Embodiments of the invention are directed toward systems and methods for detecting a laser beam incident at a sensor. Embodiments of the invention may also determine the incident angle, the wavelength of the light, the power, and/or the pulse rate of the incident laser beam. This information can be used to conduct real time countermeasures and/or may be communicated to a control station. Some embodiments may also include a device that includes a photo detector and a m mask ask. The mask may include a plurality of line and/or circular apertures. Some of the apertures may be located on the mask to activate pixels in the top and/or bottom of the photo detector when illuminated from a zero angle (zenith). Embodiments of the invention also include methods that perform a number of related functions.