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Iv4
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Dry ice as a laser medium
As most of you know,CO2 is one of the best laser mediums.It oprates trhough a wide degree of presure,oe of the few that are superradeint(well without
like a km of resonater anyway)and operate under atmoshperic presure(and more).It's strongest line is at 10.6 PM(wt another at 9.8 or so).
Now I'm thinking that if dry ice were used the gain might be even higher because of the density and so reap the benefits of a solid
state.Coments?
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Nick F
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The CO2 is mixed with He and nitrogen, IIRC, although I bet it varies from design to design. The He is excited by an electrical discharge, and it
passes on its energy to the CO2 molecules, which then emit it when stimulated and are then ready to absorb more energy.
This would not be possible with solid CO2  .
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Basement Chemist
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Do you know any websites where more information can be found about these CO2 lasers? In physics class we just went over it in like 10 minutes....
I am curently hiding from the DEA...
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DDTea
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If CO2 lasers require He or N2 in order to work... Would it be possible to have a mixture of Solid CO2 and Liquid Nitrogen?
Still, I wouldn't want to be the one operating it if it has the potential to build up so much pressure.
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Nick F
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If you can find a way to ionise liquid nitrogen to the point where it is conductive, then be my guest to try it  .
Even if you could do that, dry ice and LN2 have different densities, so the light would get scattered everywhere.
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Iv4
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Sorry for being late
Actually rhere are soe accounts of CO2 only lasers working(with reduced effeciancy)Though you probably right.The lower effeciancy and the container
needed for the presure or the cooling does'nt justify not just building a larger laser.
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Iv4
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I was looking at gas flow dynamic lasers and it seems that if microwave pumping was used it could excite the Co2 directly.So the dry ice could be
used.
Sorry about the double post.
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unionised
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Unfortunately, the colisional line broadening of the transitions would make life difficult for a liquid or solid phase CO2 laser.
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Organikum
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perhaps dumb...
what about a microwave powered sulphur UV-laser?
- see sulphur-lamp.
or got I something wrong here?
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unionised
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UV lasers are generally particularly difficult; the upper excited state lifetimes are normally rather short.
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Iv4
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I have to disagree with you unionised.The nitrogen laser has got to be the easiest to build,specialy when in open air.
Maybe I'm missing something but arent sulpher lamps almost compltely free of UV light?
At any lenght I think that using a thioate(or however it speled)might be a good idea judging from copper halide lasers.
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Organikum
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the exited sulphur emitts UV which exites the argon to emitt visible light. Leaving away the argon should provide UV solely....
so I remember
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Iv4
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Well I just ran a quick google search so I guess your right  .I found some site
which said that the inert atmosphere is to keep the sulpher from reacting wth anything but it did sounds rather pointless.
Anyways you supose putting the sulpher in a glass matrix is a good idea?IMHO copper might benefit from this.
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Organikum
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Copper and microwave exitation? Not to talk of the heat. Quartz not glass..... Perhaps Si-oxide could be fused with tiny amounts of sulphur mixed
by........
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Iv4
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My mistake,but you know some sort of matrix like in a YAG or AlO.
The silicon oxide sounds like good idea.Just had a thought.Supose the matrix is somewhat conductive.It could be puped directly.
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Organikum
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I fear this would lead only to a meltdown of the matrix as strong cooling will be necessary anyways. To integrate a cooling feature in the matrix is
the bigger task IMHO....
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unionised
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The fact that there is one easy UV laser does not detract from the fact that, in general, they are difficult.
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Iv4
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Your right in that regard but I'm just saying that theres one very big exception
It could be cooled conventionaly or just maybe depending on the matrix it could be cooled magnetically.
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unionised
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Did anyone look at how the sulphur lamp works? I accept that I foolishly accepted what people had posted until I had a bit more time on my hands and
checked.
Here
http://www.sulfurlamp.com/tech.htm
is some stuff about it including a spectrum of the output.
How do you intend to get UV out of that?
(Another of the sites that google found points out that the argon is just for ease of starting)
All this stuff about cooling is hardly the point when it simply doesn't generate a lot of UV and it has a broad band spectrum.
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Iv4
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I ran a google search as well and got the same result but since I have more faith in Organikum than whoever wrote it.
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unionised
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Organikum did point out that he was working from memory. The website included such details as a spectrum.
OTOH I couln't be bothered to check it at the time so I can't complain too much.
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Iv4
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Yea I guess so
Come to think of it sulpher might be a way into the legenedry white laser.Though I have no clue about getting the thing to lase or if its even
possible.
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Organikum
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I was not sure on this
with the sulfur lamp - it was a question I asked.
I will have a look in my archives later today and do a websearch on my own for to provide clearification.
peace
ORG
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Iv4
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New branch.Co2 infuse in a Al2)3(or something)matrix.
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unionised
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You will perturb the energy levels of the CO2 and so it won't work the same way as the gas phase; it might work, but then it probably wont.
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