ce8878a0
From: rrllff@yahoo.com
On May 28, 5:36 pm, "anorton"
wrote:
> "Narasimham Gudipaty" wrote in message
>
> news:b9da4578-b200-46c9-8924-32f307f57e98@googlegroups.com...
>
> >A thin plastic hyperboloid shell is placed accurately between two focally
> >positioned monochromatic light sources in classical >conics configuration.
> >As path length difference is constant,would the shell brighten up in
> >constructive interference? Any such shell >made before?
>
> >Regards
> >Narasimham
>
> First of all two sources will not produce a stable interference pattern
> unless the are in phase with each other. This means your two point sources
> pretty much have to be split from the same laser, but that is not too hard
> to do.
>
> These two sources will produce an interference pattern assuming they are
> allowed to overlap. The problem is if you have a thin plastic shell that can
> "brighten", that probably means it has a diffuse surface. However the
> diffuser will randomize the wavefront shape of each beam coming head on at
> each other before they ever have a chance to overlap. What you will see is
> just a speckle pattern.
>
> One can, however, record the interference pattern of two oncoming beams
> using some types of holographic recording media, often recorded as a change
> of index of the media. The media material of course is flat, so what you see
> is the classic fresnel zone plate pattern. Once you expose and process the
> recording media, it can act as a diffractive lens.
One could use a holographic diffusing surface for the shell. This
will then probably show the interference pattern. This surface should
act similar to a diffuser with zero thickness.
http://www.richardfisher.com
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