92% Strehl Sloan r’ Image

The below image is our 92% Strehl Sloan r’ band image with our triplet ADC and dichroic beamsplitter in the beam. ┬áThe slight elongation of the PSF and the asymetric contrast of the fringes are due to the “zenith spike” effect of the ADC. ┬áThis effect is predicted by our models and will not manifest itself on-sky when the atmosphere will counteract the residual chromatism of the ADC.

Spot diagram showing the broadband chromatic "zenith spike" effect of the ADC in the lab.

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