Re:[ATM] Holographic Foucault null test

["Arjan te Marvelde" <arjan.te.marvelde@hetnet.nl>]

Dennis,Mauritz,

I'm not too sure if this is what you mean here Dennis, but it is actually
not the scatter from the mirror surface that puts the light in the higher (m
!= 0) order images, but the diffraction from the slit in the mask.
Also, wider slits cause lower intensity of these maxima, and ultimately the
intensity is 0.

/Arjan

<<<
>
>   Also, should this work equally well for mirrors that are
> already coated, or would the scattered light be at too low of
> an intensity to see the interference pattern at the m=1 position?
>

It works also for coated mirrors, the m=+-1 diffraction order
will always be about 40% intensity of the zero order, independent
of the mirror reflectivity.
(Just be a bit more careful when using lasers as lightsource since
the intensity can be too big.)
>>>

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