[time-nuts] Surplus Guidelines, was: Rubidium Standard

[Bill Hawkins]

Well, if the glass itself is blackened, the laser will
probably just melt a hole in the glass. No reason not
to try, though. A blackened bulb is useless.

In my case, I have normal photocell current but no
second harmonic. That doesn't seem to be a blackening
problem. I did not make a crystal frequency measurement.
Perhaps that's the best bet.

Bill Hawkins
 

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Robert Deliën
Sent: Sunday, December 10, 2006 2:57 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Surplus Guidelines, was: Rubidium Standard

> > What is the blacken from, the rubidium itself?
> 
> Yes, the rubidium enters the glass and that blackens it.

Isn't it deposited metal from the filament that blackens the glass? 

> > Hmmm I wonder if a high power laser can liberate enough to make one 
> > useable again? I have about 100000 shots left on a 6 megawatt laser.
> 
> I doubt it.  It is not just evaporated on the inside it is actually
absorbed into the glass.
> 
> At least as I understand it.

I doubt it too, but if you're going to try it make sure the bulb it
powered: If it's filament deposites, the metal vapor might deposit back
on the hot filament, just as happens in halogen bulbs. And don't forget
to post your results!

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