A new kind of absolute absorbing high-power laser energy meter is reported in this paper. The energy meter has the
advantage of simpleness, high damage threshold and high precision. The measurement principle, material and the
structure of the energy meter is introduced in the paper. Many different kinds of effectors affect the high-power laser
energy measurement results, these factors including backscatter, heat loss and accuracy of temperature measurement etc.
The paper analyzes all these effectors on the measurement results and the consponding compensating models is given to
enhance the measurement results. Energy meter measurement uncertainty is given in the end.
Digital Foucault tester for quantitative estimate the wave form of aspheric surfaces is based on the high precision
knife position determination and the image data processing methods. In this paper, we report a set of digital Foucault
tester for the measurement of parabolic surface. The movement of the knife-edge is controlled by PC, and the
shadow patterns are captured by a CCD in real time and then are fed back to the computer. A new kind of data
processing method, which has the advantage of simple arithmetic and high precision, is given in the paper. The
method offers a reliable base for Digital Foucault tester.