Re: [ATM] 7 inch sphereical mirror

[Richard <cnc@cncservo.co.uk>]

Hi Richard,

Saturday, April 12, 2008, 4:49:59 PM, you wrote:

RFLRS> I can't confirm that.  When focused at the 70.701% zone crossover, the
RFLRS> Visual
RFLRS> Strehl is about 0.92.  The RMS wavefront error is lambda/21.23 (550 nm)
RFLRS> and P-V is lambda/6.33.  The RMS spot size, depending on what part of ZEMAX
RFLRS> you believe is between 11.36 and 11.5 microns diameter.  The full spot
RFLRS> diameter
RFLRS> is greater than 27.83 microns.

If your figures are correct, and a Strehl of 0.92 corresponds with an
RMS spot size of twice the Airy disk size, then it makes a very good
case to never use Visual Strehl as a guide to optical performance.

RFLRS> depending on what part of ZEMAX
RFLRS> you believe

All of it. It is the premiere optical design program and in a class of
its own.

-- 

Best regards,
  Richard in the UK

_______________________________________________
ATM mailing list http://www.atmlist.net/