Scanning System for Measuring Uniformity of Laser Detector Response and Laser Beam Dimensions

摘要

The reliability of detector calibration depends upon the uniformity of detector response and the dimensions of the interacting laser beam. The report describes a computer-controlled scanning system for measuring these parameters. Appendixes A through J present many important details needed to understand and use the system. Appendix J describes the linear detector (ROSY 7-1) that monitors the detector under calibration in the scanning system. The device to be measured is scanned in a plane perpendicular to the axis of a stationary laser beam. Software using output and position data give surface graphics and information, and beam radius and shape. To determine linearity, measurements are made at two or more power densities. The user may determine experimentally the effect of changing beam size on uniformity measurements. Uniformity scans in the report fluctuated more for smaller beams than larger ones. They were smoothed and rounded for beams larger than coordinate steps. The remainder of the report describes system layout and interfacing parts, software, measurement procedures, examples, applications, and conclusions.