🔭 Segmented Mirror Phasing: Piston, Tilt, Strehl Ratio and Point Spread Function (2D)

A one dimensional slice of a segmented telescope mirror with up to nine segments. Give each segment a random piston step and tilt, change the wavelength and the aperture, and watch the far-field point spread function lose its sharp core. The Strehl ratio, the Marechal estimate, the wavefront error budget and the way a breathing mirror makes the image flicker are computed by a direct Fourier sum, with four in-page numerical checks.