Re: [CAD_CAM_EDM_DRO] High pressure water jet (Lasers)

Jon,

I thought that as well to begin with. But in most really big industrial
sized CO^2 lasers the medium is usually something like 70% He with other
gases for better lasing actions, N being one of them. I'm not sure but
doesn't He have a lower freezing point than N? It's late again so I'm
proberly making more and more mistakes, I can't remember which way the
boiling points go now. The glass will never conduct that sort of
temperature, or lack of, evenly throughout the flowing gas I wouldn't think
and especially as it's going to be emitting quite a lot of heat as well. I
suppose something like ethanol would do pretty good for a home built one,
pumped through a radiator in the fridge. Or even better, you could cool the
ethanol with some of those pipe freezers plumpers use. I've seen proper lab
coolers for that kind of thing but I've seen the price as well. Maybe I
could coach my school into funding an 'investigation' into this very fact.
: ) If I've managed to get the Bp's backwards then I mean to say them
the other way, if you know what I mean.

Best wishes,
John

----- Original Message -----
From: "Jon Elson" <jmelson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, March 12, 2001 6:14 AM
Subject: Re: [CAD_CAM_EDM_DRO] High pressure water jet (Lasers)


>
>
> e.heritage@... wrote:
>
> > I'm very interested in lasers
> > and I may even look at doing it at university if the laser builder of
this
> > group wants to talk about CO^2 with anyone. I'd make my own but I don't
have
> > enough cash to make it worth while right now. : ( I'm not sure I
could
> > trust myself around one either, I'd proberly just have to try beefing it
up
> > with some LN^2 cooling. [Mu-ha-ha-har] I read diode lasers increase in
> > efficiency by 90%+ if they're super cooled. Imagine making your CO^2
laser
> > 90% efficient. You could be running a KILO watt tube instead of 100w.
The
> > fact that it's not done in industrial sized tubes is making me think
though
> > that perhaps there is a reason for LN^2 not being used. ?Thermal
lensing?
> > ?Cost? ?It doesn't actually work with gas tubes?
>
> You can't cool a CO2 laser with liquid Nitrogen, as it will freeze the CO2
> gas into a white blob which will not be much good as a laser medium.
>
> Jon
>
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