Abstract: A radiometer the calibration of collimated pulsed laser sources. In one embodiment the laser sources have wavelengths of 1064 nm and 1540-1570 nm wavelengths at irradiance levels of 7×10?5 to 5×1010 Watts/cm2, with pulse widths of 5-400 ns. A lens system used to focus beams from the laser sources includes two piano convex lenses and one aspheric lens, all with 1.5 micron and 1.06 micron anti-reflection coatings. An InGaAs avalanche photodiode (APD) detector and a linear amplifier generate an output voltage which represents the pulse and power of the input laser. The output voltage is captured on a fast oscilloscope and converted to irradiance through NIST calibration factors. The detector is kept at a constant predetermined temperature with a heater ring and feedback circuit. The detector is mounted on a translation stage for placing the detector at the proper position for the 1064 nm and 1540-1570 nm wavelengths.

Abstract: A system and method for calibrating laser designator and rangefinder test sets. The system includes a high speed detector module which receives a laser input signal, and outputs a laser output signal and an electrical pulse shaped output. A variable attenuator module receives the laser output signal and includes a rotating waveplate which rotates a polarization of the received laser output signal and a Glan laser polarizing beam splitter which receives the rotated laser output signal. The polarizing beam splitter passes only vertically polarized portions of the rotated laser output signal. An energy detector module receives the vertically polarized portions of the rotated laser output signal and includes a beam splitter which splits the vertically polarized portions of the rotated laser output signal into a first path pulse and a second path pulse. The second path pulse and the electrical pulse shaped output are used to calibrate a laser designator/rangefinder test set.