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SP 127b alive and well! :D

ultimatekaiser

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Yes. A long time ago I did photographing of one of these with the intent of making a review of one In detail but I never found the time to type it up. Maybe I should do that. I also have a couple of the 124 which is the next size down, is one of the oldest helium neon laser models. The Original version had a hot filament instead of a cold cathode, and was very quickly scrapped and retrofitted into a cold cathode version along with the rest of the set-it was a part of a set with the 122 in the 123, which were quickly discontinued and only the 124 remained in production, they're all identical, but different lengths. I actually own the preliminary manual for them. All four of them had a shared exciter which could be configured the factory to run any of the three. It was quite a unique piece of equipment at the time, back before there was a normal/standard on how to make a HeNe.
 
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FRITZ HID

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found my 1st surface mirrors so here's a 25' beamshot across the house...




beam is shockingly bright for a HeNe. i'm loving this laser.
 
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diachi

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found my 1st surface mirrors so here's a 25' beamshot across the house...




beam is shockingly bright for a HeNe. i'm loving this laser.

Nice beamshot! Looks like an awesome laser. :)
 

FRITZ HID

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Nice beamshot! Looks like an awesome laser. :)
as much as i love my whiteline, this HeNe is fast becoming my fav laser!
it really is beautiful. the glass, the glow... and that awesome gas laser beam. :D makes me smiley. lol
 

diachi

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as much as i love my whiteline, this HeNe is fast becoming my fav laser!
it really is beautiful. the glass, the glow... and that awesome gas laser beam. :D makes me smiley. lol

What model is your whitelight again? Is it one of those Laser Physics jobs? I like those.
 

FRITZ HID

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What model is your whitelight again? Is it one of those Laser Physics jobs? I like those.
yes, Laser Physics Reliant 300wc.

they are nice, a lil loud and not bad to run in the winter at least. lol
the other day was windy and chilly so the wife asked me if i wanted to play with my ArKr in the livingroom. lol
 

diachi

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yes, Laser Physics Reliant 300wc.

they are nice, a lil loud and not bad to run in the winter at least. lol
the other day was windy and chilly so the wife asked me if i wanted to play with my ArKr in the livingroom. lol

Haha yes, they make great little space heaters!

I like the size of the Laser Physics Ar/Kr lasers (And their other ions too).

Will stop derailing your thread now! :)
 

FRITZ HID

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was tinkering around with this laser and just for S&Gs i put a lens in front, found the focal point and put the handle to a cheap screwdriver in it... and surprisingly enough, little wafts of smoke appeared and it was etching the handle! i'm impressed w/this beast!
 

ultimatekaiser

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Yeah the beam on these is thin, Gaussian, and low divergence so it can make super tiny spot sizes, and it can cut well despite the moderate power. I have a 20x beam expander I can use with one that makes the beam fairly large, but the already low divergence becomes insanely low.
 
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ultimatekaiser

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It’s because the tube is assembled by hand in sections. The joints probably use a glass that has a dopant in it to adjust its thermal properties. Sometimes the bore will be made with a similar type of glass, usually a rare earth metal to make it more stable and help prevent the discharge from damaging it, and to aid in manufacturing.
 

FRITZ HID

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That was my guess as well, just seemed odd to me being in only that one little spot.
 

ultimatekaiser

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That was my guess as well, just seemed odd to me being in only that one little spot.
Yeah, borosilicate glass is pretty high temperature and hard to work with so usually those will be blown separately and then they will be joined with an intermediary glass that is easier to use. That’s also why there’s a hint of green at the end, as that is where the fill stem was.
 

LSRFAQ

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It is not ordinary Pyrex on these... It is an aluminosilicate that has reduced helium diffusion and specialized expansion properties that let it bond to Kovar for the lead thrus. Junctions between the different glasses need 3 or more different glass types on average aka a graded seal..
Most likely the bore is 7052 or an English variety called Durham Glass as well as other names.

If it has optically contacted or hard sealed fused silica or quartz Brewster windows then a even more complicated graded seal can come into play on the stems.

I've spent years hunting down sticks of the exotic glasses. I have most of them.

S,
 
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