Responsivity: Detector conversion constant, incident photons to a current.
Detector: Responsivity varies with wavelength. Detects between 800-1800nm. Peak responsivity is 0.7 amps/watt at 1550nm. Detector to detector responsivity variation can be as great as ±20%.
Power: Power in the measured laser beam. Assumes a round beam diameter. An elliptic beam can be approximated by using the maximum width dimension and assuming all the energy is in a beam of this diameter. For extremely elliptic beams (ratio >4:1) contact the factory.
Beam Diameter: Circular laser spot being measured by a narrow slit. Clip level method.