Fig. 7.
Top: closed-loop GSC images for different entrance fluxes. In the chosen configuration, the exposure time is 2 ms, and we collect 10% of the photons in the sensing path. a: infinite number of photons. b: Guide-star magnitude = 8 (nph = 55 000 on the GSC). c: Guide-star magnitude = 10 (nph = 9000 on the GSC). d: Guide-star magnitude = 12 (nph = 1400 on the GSC). Bottom: OG estimate for the noise-free system compared with the three noisy configurations.
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