This paper briefly describs a method of quantity value delivery and range extension of laserradiationpower.
简述传统激光辐射功率量值传递和量程扩展方法，用经典理论和量子光学理论对传统方法进行了简要分析。
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Thermal distortion of mirrors caused by high power CW laserradiation and pressure distortion by water-cooled back pressure have been measured using a Twyman-Green interferometer.
The results show: pulse power density from CO2 laser reaches air breakdown threshold through thrice reflecting focus system, and plasma radiation phenomena is observed in the experiment.