Abstract
The focal spot method using a scanning photodetector to measure the intensity distribution in the spot completely solves the problem of determining the radiation pattern of cw lasers and has been applied in instruments. The application of the method to pulse lasers has a number of difficulties. A photorecording detector must be placed in the focal plane of the lens. The measurement diagram in which the possibility of the origination of errors is diminished to a significant extent is presented. A light dissipating screen is placed in the lens focal plane. A spot picture, whose grain size is inversely proportional to the size of the focal spot on the screen, hence appears on the screen. The mean illumination of the screen turns out to be independent of the divergence and by selecting the size of the inhomogeneity of the screen it can be made constant in the central portion of the recording screen, which facilitates the condition of its operation.
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