Thread: Strehl ratio
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Old 01-09-2019, 07:30 PM
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Wavytone is offline
Join Date: Jul 2008
Location: Killara, Sydney
Posts: 4,147
UPDATE: updated graph - see below. I've coaxed Excel into doing a quadratic least-squares fit instead of linear, and zoomed in on the region of most interest. FWIW the curves are automatic in Excel, not of my doing.

I was interested because previously from the Russian examples I had guessed a few rough approximations, as follows:

PV 0.30 (⅓ wavelength) ~ Strehl 0.90
PV 0.25 ( wavelength) ~ Strehl 0.94
PV 0.16 (1/6 wavelength) ~ Strehl 0.95
PV 0.12 (1/8 wavelength) ~ Strehl 0.98

Though it's only a rough correlation as pointed out before, eg a turned edge vs a central hump.

Last edited by Wavytone; 01-09-2019 at 08:06 PM.
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