the averaged pulse energy of a pulsed type laser source can be measured by several types of commercial laser energy meters , such as pyroelectric detector or thermopile sensor , the spectral responsivity and the time / frequency related response properties of which are compatible with those of the pulsed type laser source . these commercial laser energy meters , regardless of sensor / detector type , should be calibrated against the working standards calibrated in a national traceability chain relying on primary standards on the highest level having the lowest uncertainty in realizations of the fundamental si units . fcis based - lemcs designed in this invention accomplishes both of the above proficiencies of measuring the averaged pulse energy of the pulsed type laser source and calibrating the commercial laser energy meters , which are traceably to primary level standards . fcis based - lemcs contains an integrating sphere having a novel port and an interior design and a series of mechanical choppers having separate duty cycles , each of which is rotated by an electrical motor in fcis based - lemcs , used for generating a chopped type laser , called as chopped type laser source , in order to provide the reference and averaged pulse energy for traceable calibration of commercial laser energy meters . with this invention , in addition to generating the reference and averaged pulse energy to be used during the calibration of commercial laser energy meters to be performed by means of fcis based - lemcs , the peak pulse energies of the pulsed type laser source and the chopped type laser source , which is a strict part of fcis based - lems and which is used for producing the reference averaged pulse energy in the calibration of commercial laser energy meters , are also measured by fcis based - lemcs , traceable to electrical substitution cryogenic radiometer in primary optical watt scale , to 133 cs atomic frequency standard in time scale t , and to direct current unit realized with quantum hall — primary resistance standard and dc josephson primary voltage standard . with this configuration presented as a preferred embodiment , the averaged pulse energy measurements are performed and achieved for a range extending from 16 . 5 p j to 100 mj .