Hej Bruce,
Ah yes, that's it. Sorry for the bad wording.
Cheers,
Magnus
On 11/04/2016 11:41 PM, Bruce Griffiths wrote:
Hej Magnus
A quarter waveplate doesn't depolarise, it can however convert a linearly
polarised beam to a circularly polarised one.If you really need to depolarise a
laser beam, scattering from a colloidal suspension of Titanium dioxide is very
effective.There are no macroscopic moving parts.Brownian motion of the
colloidal partticels suffices.
Bruce
On Saturday, 5 November 2016 11:28 AM, Magnus Danielson
<mag...@rubidium.dyndns.org> wrote:
Hi,
On 11/04/2016 10:27 PM, Poul-Henning Kamp wrote:
--------
In message <2af27ebe-9200-c348-c89b-b98f9c973...@karlquist.com>, "Richard (Rick)
Karlquist" w
rites:
Also, one of the Rb isotopes is slightly radioactive.
35 years ago, the guy in the next cubicle got away with
storing it under his desk. He also happily smoked
cigarettes all day at his desk. Another ERA.
Rb87 has a halflife north of the age of the planet as far
as I recall, and the result is a beta which goes nowhere
far and Sr87 which is stable.
With a half-life of 49.2 Gigayears compared to universe life around 13.8
Gigayears and the beta-decay within both glas and metal enclosure, I'm
not overly concerned. For all practical purposes it is essentially stable.
He got a lot more ionizing radiation from his cigaretess than he
ever got from the Rb87.
Just for the heck of it, I'd go laser instead of the old UHF lamp.
The 780 nm laserdiodes isn't all that hard to get, in fact I've got some
lying around. Depolarizing needed with a quarter-wave needed not to get
a Stark-pull.
With respect to precision machining, that space has changed a lot
over the last five years, with precision CNC machines, factory
or home-built, dropping dramatically in price.
You need to tune it regardless.
Cheers,
Magnus
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