[ATM] Fw: Sixtests and P-V Error

[ulhas_ngp at sancharnet.in (Ulhas Deshpande)]

I had sent this message earlier but did not seem to make it to the list. So
sending again
----- Original Message -----
From: "Ulhas Deshpande" <ulhas_ngp@sancharnet.in>
To: <atm_free@yahoogroups.com>
Sent: Wednesday, 25 February, 2004 11:11
Subject: Sixtests and P-V Error


>
>
>  Hello all
>  James Burrows Six test programme does not give the P-V values for the
> mirror
>  under test,perhaps for valid reasons. However can his be done?
>  If we take the RMS error shown by  Sixtests and devide by the wavelength
>  would this give the RMS P-V error. Similarly if the peak to valley
distance
>  in nm was measured form the surface error curve and devided by wavelength
>  would this be the P-V Error?
>  For example I sent my mirror of for coating when I got a Strehl of 0.959
> and
>  an RMS error of 9.9 nm.
>  Does this translate to an RMS P-V error of 9.9/550= 1/55.5 waves !!!.
>  Similarly the Peak to Valley diff on the surface error curve is 40 nm i.e
>  40/550= 1/13.75 waves
>
>  Is this right?
>  Thanks
>  Ulhas
>
>