| 摘要 |
Methods and apparatuses are disclosed for setting the nodal point of a retroreflector such as a corner-cube prism. The apparatuses permit rotation of the retroreflector about a stationary first pivot axis and motion of the retroreflector along its optical axis relative to the first pivot axis, wherein the first pivot axis is perpendicular to the optical axis. Methods comprise using the retroreflector to produce a reflected image of a stationary reference object, and pivoting the retroreflector about the first pivot axis and moving the retroreflector along the optical axis to a position at which the reflected image remains stationary as the retroreflector is pivoted. Thus, the retroreflector is adjusted so as to produce a reflected beam that is exactly parallel to a corresponding incident beam even when the optical axis of the prism is not exactly parallel with the propagation vector of the incident beam. The prism can optionally be additionally pivoted about at least a second pivot axis to facilitate alignment with a remote light source.
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