A New Method of Measuring the Radius of Gaussian Laser Beam

In this paper, a new method of measuring the radius of Gaussian laser beam with circular diaphragm is reported. The intensity distritution ofGaussian beam is given by I=(2P₀)/(πω²)exp(-(2r²)/(ω²)) and theseby P=∫₀^2π∫₀^R(2P₀)/(πω²)exp(-(2r²)/(ω²))rdrdθ,式中P₀. In which P₀ is the total laser power, P is the tran-smissive laser power behind the diaphragm, R is the radius of the diaphragm and w is the 1/e² beam radius After P₀, P and R are measured,he beam radius may be obtained by W=√-(2)/(ln(1-P/P₀))R.