[ATM] WG: Focault (sic!) Help
vla at copper.net
Wed May 26 21:42:56 JST 2010
Berthold Hamburger wrote:
>It is also interesting to observe the Strehl ratio for the isolated
>Even the 1/10 wave astig remaining in the mirror currently will reduce
>Strehl ratio to 0.8.
Something is not right with that calculation. There is a constant
relationship between the p-v and RMS error for primary astigmatism,
RMS=(p-v)/(sq.rt.24). With 1/10 wave surface error doubled in the
wavefront, the RMS is still only 0.041, for 0.93+ Strehl.
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