Re: Mirror Mount Question

Iain Mackay wrote:
Thanks for the reply folks

Unfortunately, I already have a few kinematics mounts but, as I mentioned in my OP, these aren't ideal if you only want to move the mirror in one plane - as in tilting 'forward' to produce fringes from the fully compensated (wide angle) position of a MI. (The KMs all seem to move the mirror in two directions at one. I know you *can* then correct this using one of the other screws but it gets to be fiddly after a while)

My "three screws in a triangle" comment is a mount has the spring-loaded screws in an equilateral triangle with one screw at the top centre of the plate that is set by the screws - this is the one you use to tilt the mirror forward for fringes. I was interested to see if anyone had this and the translation stage available.

Ah well, looks like a custom job after all.

Thanks

Iain



"Iain Mackay" <no_one@here> wrote in message news:5cednaeIoqCYgnjbnZ2dnUVZ8sKlnZ2d@xxxxxxxxxxxxxxx

Optics folks



I'm looking for a manufacturer of a mount suitable for use in the moving mirror in a Michelson Interferometer.



I'm using 1" square mirrors and a 1" cube BS and tried using Edmunds mounts for the mirrors, but I now realise that these are kinematic mounts and are not really suitable for what I want. (I believe that they are designed to provide the maximum freedom of movement with the minimum number of 'screws'. It *is* possible to set up the MI with these mounts, but adjusment in one plane is difficult.



Before I set off on a possibly expensive custom mount I thought I 'd check and see if there is anything out there.





What I'm looking for is a mount that will allow precise 'X' translation possibly with a differential type adjuster (to set the path length) together with a '3 screws set in a triangle' type of mount to allow parallelism and tilt (for controlled fringe formation) in the Z axis to be controlled.



Can anyone point me in the right direction? - a UK supplier preferred but not essential



TIA

Iain M




I see, what you want is mirror mounts where the two tilts are about orthogonal axes--I thought you meant that there was too much interaction between the tilts and the translation.

All of my kinematic mounts are reasonably orthogonal, made with two screws and a ball bearing. They're mostly Newports, and are arranged so that the lines joining the ball with the two screws are orthogonal. They aren't difficult to get at all.

[Of course the balls on the ends of the screws aren't ever quite centred, so the 'kinematic' mounts do wobble back and forth a bit as you turn the knobs. The interaction can be quite strong on small scales, so this is frequently an irritation.]

Cheers,

Phil Hobbs
.

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