Kuder optical path indication optical axis leading-out method based on interferometer measurement

The invention discloses a Kuder optical path indication optical axis extraction method based on interferometer measurement. The method mainly comprises the following steps: (1) parallel light emitted by an interferometer is reflected by a beam splitter prism 1 to enter a beam splitter mirror 2, is reflected by a beam splitter prism 2 to a primary beam shrinking mirror group, then enters a main system, and is subjected to auto-collimation by a standard plane mirror to return; the positions of the beam splitter prism 1, the beam splitter prism 2 and the interferometer are adjusted, so that the light beam is located at the center of the target, the system wave aberration is minimum, and the fringes are minimum, namely the interferometer optical axis position is the optical system optical axis. And (2) when the plane wave interferometer is placed at the position of an optical axis, a reflecting plane mirror is added between the beam splitter prism 2 and the first-stage beam shrinking mirror group, and the reflect