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OK, your coherence isn't the problem - laser light stays as coherent as it started over a theoretically infinite distance - the problem is wavefront and/or phase distortion.  The nice laser beam may end up hideously deformed after so many reflections off inperfect...

I need access to preform fabrication and fiber pulling tower plant for small scale fiber design project. Any contractors out there?

John<br> A small Carbon Dioxide (CO2) laser perhaps 20 to 50 Watts would melt silica materials very effectively. The laser beam can be 'focussed' using simple lenses to &lt;100 micrometers so that should fit with your size requirements. These size lasers start at $5,000 so to try the idea it...

Anyone know of any on-line calculators or freeware for calculating the resonant vibrations of an aluminuim plate driven in the centre and clamped around the edges?

Thanks sford<br> A rough idea of cost would be useful.<br>

thanks 13. So BN is not suitable for diamond machining to give a sub micron surface roughness?<br> Ever heard of this Shapal-M by Tokuyama?

I've used Alumina for ballasting electrodes in an RF plasma generator. BN has some better mechanical and thermal properties I could use. How does it repond to RF fields?<br> I've also seen a material called Shapal-M (which is AlN and BN mixture) - any knowledge of use in RF apps?

I'd like to measure the temperature near a RF plasma generated with a power of 1 kW. The plasma is inside a low pressure aluminium chamber. I've used liquid crystal temp &quot;badges&quot; that change colour. Would like something more real time.