Abstract: ent the results of a round robin in which six U.S. manufacturers of beam analysis instruments participated. Following a procedure recommended by the International Organization for Standardization (ISO), participants used a camera, pinhole, slit, or knife-edge to determine several parameters characterizing the beam of a common laser source. Their results and ours are displayed graphically and analyzed statistically. Agreement on beam width measurements is in a range around five percent relative standard deviation while significantly less agreement exists for other quantities calculated within the ISO procedure. !1
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