I never thought I'd see one of these at a price I could afford:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiexaD-sf6P2491qzSOPjalzaYfvFHUFfzfAk6ABVDBW74F8PfaoOLj80Vx70T4FWEBpF8nIIS9ZTFfg6MPztqIikIzckkeHG2kQxWOslNC7fYYxTsebFPNhvHB-PUyxYcy7ygxuo-Kv8U/s320/2mW-green-33.jpg) |
Click to enlarge |
The last time I bought a green (543.5nm) Helium-Neon laser tube it was only about .2mW so this is quite a jump in power. At 19 inches it's the longest He-Ne tube I've ever seen. I have diode laser pointers that are more powerful but the beam is nowhere near as well collimated.
I bought it on eBay from
Meredith Instruments (check out their active auctions—their web site is here). They still have
nine five left as I write (they started with 35). They were kind enough to include clips and a ballast resistor with it. I used the power supply I got with
the last auction I won.
I made the stand out of scrap wood, hot glue and some paint. Don't look to closely at it. I put more a lot work into the picture. Well, now that I look at it I realize that I have the ballast resistor on the cathode instead of the anode but it works anyway.
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