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A novel diagnostic system is presented, that is capable of measuring the two dimensional beam distribution in the focal area of high power CO2 laser under full power loading. The device is based on beam probing using a pinhole located at the end of a hollow needle. The spatial resolution is 10 x 10 microns 2. The system has been used to measure intensity distributions of commercial laser systems including the influences of beam distortions induced by the power loading of relay- and focus-optics. Beam diameter, divergence angle, and maximum intensity are calculated from contour lines of equal intensity. The area surrounded by the contour line containing 90 % of the beam power is used to calculate an asymmetric distribution or those produced by focusing a hollow beam from an unstable resonator. Several examples of focal spot distributions of focused high power CO2 laser beams are presented.