Real-time detection and control method for spot area of high-power pulsed laser is discussed.The laser spot area real-time control system that adopts a continuous laser whose wavelength is 532 nm and CCD-FPGA technology is developed.The characteristics of system are analyzed according to several experiments inlcuding the analysis for laser spot

CCD video signal and binarization signal.The binarization threshold of CCD video signal is 405 mV

FPGA’s control error range is 24 which is 10 binary.Calculation and calibration of laser spot area

the maximum relative measurement error of spot area is 0.5 % and the absolute error range is 8 μm2.The system can be directly applied in real-time control for the laser fluence in laser micro-polishing.