Based on methods developed earlier for calibrating the sensitivity of pulse photometers, a new modification of the method is proposed for attenuating pulsed radiation energy in wide limits, reaching a factor of 106, without using optical attenuators. Calibration errors over high and low reference levels of optical-radiation energy and power are considered.
É. V. Kuvaldin, "Method of calibrating pulse photometers of radiation energy and power with conversion in time," J. Opt. Technol. 73, 528-532 (2006)