be sure to look at the plasma glow through a diffraction grating...
it's beautiful and unexpected.
Jr. Woodchuckington Janitor III, Esq.
be sure to look at the plasma glow through a diffraction grating...
it's beautiful and unexpected.
suppose you're thinkin' about a plate o' shrimp. Suddenly someone'll say, like, plate, or shrimp, or plate o' shrimp out of the blue, no explanation. No point in lookin' for one, either. It's all part of a cosmic unconciousness.
Senior Member
Always a beautiful site
Yes, that Sam.
But note that most of the lines you can see will not lase, essentially because you can see them.
--- sam
Jr. Woodchuckington Janitor III, Esq.
which is a real shame... i'd love to have a blue HeNe.
Originally Posted by lasersam
But note that most of the lines you can see will not lase, essentially because you can see them.
--- sam
suppose you're thinkin' about a plate o' shrimp. Suddenly someone'll say, like, plate, or shrimp, or plate o' shrimp out of the blue, no explanation. No point in lookin' for one, either. It's all part of a cosmic unconciousness.
Senior Member
The original origin of HeCds. Ha.
Creaky Old Award Winning Bastard Technologist
A caution, most Hene optics are designed to suppress some lines.
Steve
Qui habet Christos, habet Vitam!
I should have rented the space under my name for advertising.
When I still could have...
Senior Member
I've read about methods used to suppress IR from competing with the intended lines, but I wasn't aware that they made some to combat the visible spectrum. Do they follow a sort of system? Normally broadband, or just a line or two? I'll be sure to read into this.
Creaky Old Award Winning Bastard Technologist
The coatings are almost always proprietary, I have to run them through a spectrophotometer to find out what I have. The good news is most college chemistry departments have the CCD based spectrophotometer, so its not hard to get a trace of a given optic, provided you make a masking support to hold the optic. You have to run the calibration run with the mask in place, unless the spectrophotometer beam is smaller then the optic. The exact angle in the spectrophotometer beam is not critical, I used to run shots holding the optic against the sample holder by hand. Most Spectrophotometers use the big beam to fill a cuvette, so I end up making masks and optics mounts out of scrap stock. '
Some are used to dump the 650 Raman Line etc. Sam gets away with what he does because of the sheer number of mirrors he has. Have patience. The one trick I did pull off was getting a few microwatts of the yellow line from a 604 nm REO tube. I used a REO broadband HR with a better then 99.995 coating from 457 to 650. One of their super-polished ion plated mirror coatings. Mine has a two meter radius. I PMed you with where to find them.
Otherwise I have a hard time duplicating some of Sam's results with internal mirror tubes.
I have gotten a few of the other lines, but it requires a really good mirror mount and patience. Often I have to resort to a pair of Littrow prims or a Littrow and a grating just to find the lines, with a long throw in a very dark room. The Littrow used in the Ohmeda tube is magical, very well designed, and I have one from a dead Ohmeda head for just this purpose. A Brewster prism from a Lexel or Coherent ion laser works almost as well.
CTR Surplus often has a few dead Ohmeda heads in their back room. Note I stress the DEAD part. The optic and prism are, of course, still good.
Steve
Last edited by mixedgas; 08-05-2013 at 03:52.
Qui habet Christos, habet Vitam!
I should have rented the space under my name for advertising.
When I still could have...
Senior Member
I knew Ken Sample. he set up the PMS laser line and got most of the bugs out of the vacuum systems etc then when they started to make good lasers PMS decided to fire him. I have seen many companies do this...so stupid.
It is a small laser words Chad...
Phil Bergeron( AKA 142laser)
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