SELF-REFERENCING CYCLIC SHEARING INTERFEROMETER FOR COLLIMATION TESTING

We present here a self-referencing dual-field cyclic shearing interfer ometer for collimation testing. To generate the two fields, one of the two mirrors of a cyclic shearing interferometer is replaced by a doub le mirror. Ray tracing is carried out to determine conditions for obta ining fringe patterns suitable for self-referencing. Actual fringe pat terns obtained in a self-referencing cyclic shearing interferometer ar e shown and the setting sensitivity of the interferometer is determine d.