Performance comparison of the Shack-Hartmann and pyramid wavefront sensors with a laser guide star for 40 m telescopes

Open Access

Table 2

Average variance of the signal coming from the SHWFS and PWFS for a 40 m telescope with six LGS using the generalized least squares estimator.

Wavefront sensor	Normalized average signal variance due to RON	Normalized average signal variance due to Photon noise
6 SH + 6 LGS	0.81	0.24
6 PWFS + 6 LGS	0.70	0.50

Notes. The variances are normalized by the variance obtained by using a 1-arcsec spot as a guide source.

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