[Raytrace] Optimization

[Richard F.L.R. Snashall]

Peter John Smith wrote:

>: "Richard F.L.R. Snashall"  wrote
>
>
>>using an appropriate field and the built-in Photopic wavelength
>>selection:
>>
>>        wavelength  weight
>>          0.470      0.091
>>          0.510      0.503
>>          0.555      1.000
>>          0.610      0.503
>>          0.650      0.107
>>
>>After optimization, the Polychromatic Strehl ratio was 0.840
>>
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>>I found (and I have found this consistent using several different
>>glass combinations) that, if I optimize instead for wavelengths
>>0.482, 0.522, 0.571, 0.628, and 0.670 (adding 12 ... 20 nm to
>>the each) that the Strehl ratio improves to 0.860.
>>
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>I suspect that the discrepence is totally due to your choice of what Zemax
>calls the 'primary' wavelength.
>
>This is the weavelength chosen for the reporting of any wave errors.
>
>Most likely Zemax was automatically set for 550 in the first case, then 571
>in the second case. The Strehl would increase with larger wavelengths so
>this is consistent.
>
>How this impacts on the calculation of the 'Polychromatic Strehl' I am not
>sure but it would be easy to introduce a sixth wavelength of 550 in the
>second case, giving it a weighting of 0 (or if it dont like that 0.00001)
>and setting it as the Primary wavelength and then repeat the calculations
>with this.  This should confirm what is happening.
>
Adding a sixth wavelength to the second case (0.555, weight 1e-6),
making it the primary, regenerating the default merit function to
include the new wavelength, and reoptimizing changes the result by
about 0.002%, so it is not the Polychromatic Strehl reporting function.
(I had surmised this from cross-checking the results with the OSLO
Polychromatic Strehl reporting.

                       Rick S.

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>I know I have had inconsistencies traced to the accidental changing of the
>primary wavelength which went unnoticed for quite a while.
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>Peter Smith.
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