[time-nuts] Thinking outside the box a super reference

Magnus Danielson magnus at rubidium.dyndns.org
Fri Nov 4 19:08:03 EDT 2016


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 <magnus at rubidium.dyndns.org> wrote:
>
>
>  Hi,
>
> On 11/04/2016 10:27 PM, Poul-Henning Kamp wrote:
>> --------
>> In message <2af27ebe-9200-c348-c89b-b98f9c973974 at 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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