On MagAO-X, incoherent speckle probes can estimate optical gain in real time and roughly track a benchmark measurement, but they underestimate at high gain and the focal-plane Strehl method is unreliable.
Adaptive optics for extremely large telescopes,
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Comparing realtime optical gain measurement and methods on MagAO-X
On MagAO-X, incoherent speckle probes can estimate optical gain in real time and roughly track a benchmark measurement, but they underestimate at high gain and the focal-plane Strehl method is unreliable.