About Optical DRO

Hi Jon & Ian !

Great ! Thanks !

I was well tucked into bed when I read your answers, - and you know what ?
Sure I had to crank up this linux box again :)

Well, I have lost my marbles. Ian is polite - he says it is just arneithis :)

I thought it was about 6 months ago, - but it could have been longer. Well
anyway, Elliot wrote something about interferometry, - somehow he managed to
send me tumbling down a cliff of all I have been used to believe. He just did
it again. Some idea I just can't see clear in my foggy condition :)
I have wandered around like a zombie, trying to - just find my marbles :)

Then Jon came along with his tilted gratings ! What a mess ! :)

To both of you, - sure I have played with the same idea for years. By the way
Jon, - it would be real nice it you posted a picture on your home page of your
setup.

Okay, here is what I messed up:

I though Jon meant to tilt one of them like you should open a book !! I was
playing Einstein ! I tried to imagine how it would be if I was siting on a
photon, riding along with the beam of light. What on earth did Jon see ? I
just could not understand why he would tilt it like that - but I have always
learned that Jon use to have some real good reasons ! So then, - :)

Well, maybe I will have some sleep now, - or will I try to ride out on Elliot's
beams ?

Like Baron von Sch..nauser?? - what's his name again, - he rode on a canon
ball.

//ARNE

PS: Jon, I like the setup you explained. I didn't know that the gratings had
so fine lines. I draw something on plastic sheets myself, by hand. I could
measure down to such an unbelievable fractions of a mile :)

Is there any made gratings, sheets, what ever you could buy cheap ? ( I mean
to experiment with )

By the way - I have also played with the idea of using a laser pointer on such
an arangement - using a mirror on the moving axis, and directing it to a camera
for analyzis - but vibrations would probably ruin it. - Well, back to bed.

Thanks guys :)