Fiber couple integrating sphere laser energy meter and calibration system traceable to primary level standard

摘要

The average pulse energy (J) of a pulsed laser source can be measured by several types of commercially available laser energy meters, such as pyroelectric detectors or thermocouple sensors, whose spectral response and time / frequency relationship Response characteristics are compatible with the spectral responsiveness of the pulsed laser source and the response characteristics of the time / frequency relationship. Commercially available laser energy meters, irrespective of sensor / detector type, in the national (or international) traceability chain relying on the highest level of primary standard with the lowest uncertainty in realizing the basic SI unit It should be calibrated against calibrated practical standards. The FCIS LEMCS designed in the present invention realizes both the ability to measure the average energy of a pulsed laser source and the ability to calibrate a commercially available laser energy meter and these measurements and configurations are applied to a primary level standard It can be tracked together. The FCIS type LEMCS includes a new port and internal design and a series of mechanical choppers with a separate duty cycle and each of these choppers is rotated by an electric motor of FCIS type LEMCS and these choppers are used to chop Type laser source to provide a reference average pulse energy for calibration of a commercially available laser energy meter. According to the invention, in addition to generating the reference average pulse energy used during the calibration of a commercially available laser energy meter performed with FCIS type LEMCS, the peak pulse energy of the pulsed laser source and the chopped laser source Is also measured by FCIS type LEMCS and this chopped laser source is a precise part of the FCIS type LEMCS and this is used to generate a reference average pulse energy for calibration of a commercially available laser energy meter, this FCIS type LEMCS, In accordance with the electric substitution cryogenic radiometer (ESCR), with the primary optical watt scale (W)¹³³Cs (or⁸⁷Rb) At the time scale t (s) according to the atomic frequency standard, and to the DC current unit (A) realized with the quantum hole, the primary resistance standard (ohm) and the DC Josephson voltage standard (V) It can be tracked together. According to such a calibration presented as a preferred embodiment, measurement of the average pulse energy is carried out and realized over a range extending from 16.5 pJ to 100 mJ.