Traceability of laser pulse energy measurements by linking reference standards for CW and pulsed measurements

A method linking pulse energy scale to continuous wave (CW) power scale is described. The connection between CW power and pulse energy is established by generating pulses from CW beam, and correlating the CW signal measured by reference optical power meter and pulsed-signal measured by calorimeter. In this connection CW laser source from which pulses are generated is Nd:YAG laser and the lengths of pulses adjusted are at the order of milliseconds. The realized energy scale is transferred from calorimeter to laser energy meters through using pulsed Nd: YAG laser having one fundamental (at 1064 nm) and two harmonics (at 532 nm and at 365 nm) with nano-second level pulse length.