[ATM] additional lurie-houghton degrees of freedom

[Ukyo Chen]

Actually a totally coma free lurie-houghton is not the best solution of the highest MTF and smallest spot size/ wavefront error. There are other factors like spherical that impacting the image quality.
I had stopped to use any L-H calculator since I found above rules when comparing formula version with OSLO optimized version. I'd rather to put more time in ray tracing software to design the best optic I can reach.
Here I attached original data FYI.
 
Formular version:*SPOT SIZES    GEO RMS Y   GEO RMS X   GEO RMS R  DIFFR LIMIT     CENTY       CENTX  3.9825e-05  3.9825e-05  5.6321e-05    0.000151      --          --    
 
OSLO optimized version:*SPOT SIZES    GEO RMS Y   GEO RMS X   GEO RMS R  DIFFR LIMIT     CENTY       CENTX  2.4127e-05  2.4127e-05  3.4121e-05    0.000151      --          --    



> From: vla at toast.net> To: atm at atmlist.net> Date: Wed, 20 Sep 2006 07:31:54 -0400> Subject: Re: [ATM] additional lurie-houghton degrees of freedom> > > Ukyo Chen wrote:> > > Hold on Guy, please let me know the radius data > of every surface on every lens/mirror, maybe I can > calculate another solution which doesn't need to go back<> > The radii are posted in the initial post. Unfortunately, > spherical aberration of the corrector can't be changed w/o > changing the radii, nor it can be significantly influenced by > either change in corrector location or lens inter-space. > For any given mirror, and corrector glass/location, there > is only a single aplantic solution. For this particular setup, > it is (as I already posted)>  R1,3=+/-67.42" and R2,4=-/+175.96". > Your corrector leaves in some residual coma > (1/2.5 wave PV - comparable to 1/4 wave PV of s.a. - 5 mm off-axis).> > L-H atigmatism is practically determined by the corrector > location, in proportion to (1-s)^2, "s" being the > corrector-to-primary distance in units of the mirror r.o.c.> > While it doesn't mentioned it explicitly (I think), Richard's > L-H calculator gives aplantic element radii on the push of > a button - no need to calculate or fiddle with raytracing software.> > Vlad> > > > > > _______________________________________________> ATM mailing list http://www.atmlist.net/
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