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Figure 8
Interference fringes showing the final alignment of the blank mirror (a) and diffraction gratings (b), (c). The patterns were obtained after M2 alignment with OF placed at the M2 focus. The identical tilt of the fringes and their equal periods indicate interference of two plane waves, thus confirming proper alignment of the optical elements with respect to each other as well as to the mirrors M1 and M2.

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