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by **BobH** » Fri Feb 28, 2020 11:42 am

Reflections off flat surfaces that go back into the laser may cause problems, but reflections that are divergent like those off the back of a microscope objective lens should not. I would do what is needed to make the beam look nice first. If the beams look like they flicker, or appear to be unstable, then worry about reflections into the laser.

Tennis balls can be used to isolate your table. I have used two sauce pans (with handles removed) to contain a layer of tennis balls for each leg. It is a trick I learned from Ken Haines.

by **amtonio** » Fri Feb 28, 2020 7:10 am

a question that has intrigued me lately, it is always said that the reflection of the lenses is not good so we usually deviate the lens a bit so that the reflection back does not reach the laser, but what happens with the spatial filter, usually I it is impossible to adjust it well and clean the beam well if I adjust it completely straight, otherwise the beam is not round and clean,

by **amtonio** » Fri Feb 28, 2020 7:05 am

Good afternoon from Barcelona, we usually say that the experience is a grade, therefore I will modify the structure of the table using all these forum tips, when this is uploaded some photos, thank you very much for the advice greetings to all

by **holomaker** » Tue Feb 25, 2020 10:05 am

Here’s one I forgot I had, may help here..

https://m.youtube.com/watch?v=oOON69bvhG8

by **BobH** » Tue Feb 25, 2020 9:57 am

Solid rubber does not isolate. Also, the isolation would need to be under the concrete slab, not under the steel, so that the weight of the concrete was above the isolation. Weight below the isolation does not help. The steel needs to be fully supported by the concrete. A layer of concrete patching compound with a sheet of plastic above it (to prevent glueing the steel to the concrete) will provide such support.

Rubber under the feet also does nothing but protect the floor.

If you must use that table as it is now, I would recommend only Denisyuk type exposure geometry.

by **holomaker** » Sun Feb 23, 2020 8:44 pm

I was always told to only isolate once, as if it’s done more, resonant frequencies can take over .....

by **amtonio** » Sun Feb 23, 2020 2:48 pm

I'm sorry the translation into English was not correct, I wanted to say that the iron plate rests on 12 rubber spread over the concrete block, I don't understand your answer

by **BobH** » Sun Feb 23, 2020 10:47 am

If the concrete table slab touches the steel frame anywhere, the isolation from the tubes under it will be lost.

by **amtonio** » Fri Feb 21, 2020 1:49 pm

here is the picture

by **amtonio** » Fri Feb 21, 2020 1:46 pm

tables composition? I suppose you mean the table, it is a concrete block 120x80cm and 8cm high with a 1cm thick iron plate, all attached with 5 legs (a central one) on 5 rubber to insulate the floor, instead of gluing the iron iron on the concrete, rests on 12 10x10cm tires, distributed, it was done in case one day it had to be disassembled and not weigh so much, but I think it was a mistake, I send a photo

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