determination of index of refraction
Physikfan, Wed Jul 12 2017, 04:20AMHello friends of optics
In continuation of the experiment "light velocity measurement with red laser pulses"
I would like to perform measurements of the index of refractin of liquids (E.g. water, solutions, organic solvents) and solids (e.g., glass, Plexiglass) with differently colored lasers (determination of the dispersion) again over run-time determinations of laser pulses.
For this I need about 1 m long glass tubes, with a diameter of about 1 cm, but with plane-parallel windows of good optical quality.
There is something of Leybold with a meter length and 7 cm diameter for 570 Euro plus VAT, but with a filling capacity of 4 liters, which goes with water, but otherwise not.
Does anyone know maybe a reference source?
Also glass rods, etc. with planar parallel end faces, flatness at least lambda/10 I'm still searching.
regards
Physikfan
Re: determination of index of refraction
Sulaiman, Wed Jul 12 2017, 10:02AM
I have bought SIMAX borosilicate tubing
The largest bore that I have so far is 9mm i.d. x 16mm o.d. 1.5m long ,
looking down the bore, I believe that it is straight enough for your purposes.
The glass comes in 1.5m standard lengths, shorter = more expensive due to cost of cutting.
Microscope cover slips (e.g. ) are pretty thin and flat, do you really need lambda/10 ?
the glass screen protectors for smartphones are also very thin and flat - but I doubt they can be cut without difficulty.
Actual lambda/10 :
Epoxy resin should be good enough to seal the glass flats to the tube,
the epoxy should be elestic enough to handle the slight thermal expansion differences,
but you may want to use soda-glass tubing if you think that you will use a wide temperature range or bore size.
Ideally a quartz tube and flats will give minimal thermal expansion.
I have a 160mm i.d. 5.33mm wall thickness 1.2m long glass (probably soda-glass but not sure) tube that I'd sell for £15 + p&p if you want
but I think that you should use a smaller bore.
If you seal the ends (non-trivial if optical alignment is required) how will you change fluids ?
Sulaiman, Wed Jul 12 2017, 10:02AM
I have bought SIMAX borosilicate tubing
The largest bore that I have so far is 9mm i.d. x 16mm o.d. 1.5m long ,
looking down the bore, I believe that it is straight enough for your purposes.
The glass comes in 1.5m standard lengths, shorter = more expensive due to cost of cutting.
Microscope cover slips (e.g.
) are pretty thin and flat, do you really need lambda/10 ?the glass screen protectors for smartphones are also very thin and flat - but I doubt they can be cut without difficulty.
Actual lambda/10 :
Epoxy resin should be good enough to seal the glass flats to the tube,
the epoxy should be elestic enough to handle the slight thermal expansion differences,
but you may want to use soda-glass tubing if you think that you will use a wide temperature range or bore size.
Ideally a quartz tube and flats will give minimal thermal expansion.
I have a 160mm i.d. 5.33mm wall thickness 1.2m long glass (probably soda-glass but not sure) tube that I'd sell for £15 + p&p if you want
but I think that you should use a smaller bore.
If you seal the ends (non-trivial if optical alignment is required) how will you change fluids ?
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