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james1095 11-05-2010 09:14 PM

CO2 optics
 
So I was looking around my garage recently and realized I have almost everything I need to build a small flowing gas CO2 laser. What I lack are the optics, HR and a ZnSe OC. Anyone got a line on these for a reasonable cost? Looks like I can pick up new stuff for ~$200, but something salvaged from a dead/damaged commercial CO2 tube ought to work too.

LSRFAQ 11-05-2010 09:40 PM

Re: CO2 optics
 
Quote:

Originally Posted by james1095 (Post 813972)
So I was looking around my garage recently and realized I have almost everything I need to build a small flowing gas CO2 laser. What I lack are the optics, HR and a ZnSe OC. Anyone got a line on these for a reasonable cost? Looks like I can pick up new stuff for ~$200, but something salvaged from a dead/damaged commercial CO2 tube ought to work too.


I have a new set in storage, for 3-4 foot tube at about 100$. PM me if interested.

Steve

Direct green 11-06-2010 05:04 AM

Re: CO2 optics
 
Make some. Make a plaster mold of the optics you want, (cast lenses you have). The pour in molten table salt. Boom! you have co2 optics for next to nothing.

james1095 11-06-2010 08:29 AM

Re: CO2 optics
 
I don't think it's that easy. If salt made good optics, everyone wouldn't be using expensive and toxic ZnSe. I want well made purpose built optics so I don't have that variable to deal with. Once I get something up and running I'll be more inclined to experiment.

steve001 11-06-2010 02:10 PM

Re: CO2 optics
 
Salt lenses can be used, but its hygroscopic nature make it impractical for anything other than short periods of time.
Not practical for the average person to melt salt at home either. It has a melt temperature of 801 C ( 1474 F ).

LSRFAQ 11-06-2010 04:38 PM

Re: CO2 optics
 
Quote:

Originally Posted by steve001 (Post 814276)
Salt lenses can be used, but its hygroscopic nature make it impractical for anything other than short periods of time.
Not practical for the average person to melt salt at home either. It has a melt temperature of 801 C ( 1474 F ).

NaCl optics are made on a modified Draper lens machine like everything else. The salt is quasi amorphous when cast and this results in high losses as the beam passes through it.

Besides, if you do not care about optical quality, you press KBR or NaCL powder into a form, not melt it.

Steve

steve001 11-07-2010 11:33 PM

Re: CO2 optics
 
Quote:

Originally Posted by LSRFAQ (Post 814330)
NaCl optics are made on a modified Draper lens machine like everything else. The salt is quasi amorphous when cast and this results in high losses as the beam passes through it.

Besides, if you do not care about optical quality, you press KBR or NaCL powder into a form, not melt it.

Steve

Learned something new, thanks. For further reading I came across this discussion.
Salt Lenses , Technology from Laser Mirrors

Bluefan 11-09-2010 10:30 PM

Re: CO2 optics
 
What specs do you need? I have some CO2 laser optics lying around, the university cleaned up and I think I can spare some (I plan to build a CO2 laser in the future too).

Bonnie 11-12-2010 12:14 PM

Re: CO2 optics
 
Quote:

Originally Posted by james1095 (Post 814189)
I don't think it's that easy. If salt made good optics, everyone wouldn't be using expensive and toxic ZnSe.

Wouldn't it be nice if it were that easy? Just whip up a few extra lenses in the microwave?

We are fortunate that good quality lenses are available at decent prices.


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