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Old 01-23-2010, 09:19 PM #1
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Default My Best HeNe Output So Far

In my continuing quest for Helium/Neon output, I came across this old used laser. The price was pretty good W/PSU and the seller said that his LPM only went to 30mW so it was at least 30mW.

It is a "Spectral" model RMM 355L. I haven't done any research on it yet. It is 35 inches long. The tube is in a 2.25 inch square, aluminum housing. It has an alden plug. It is powered by 3.5KVDC @ 7.5mA

The seller worried me a bit when he immediately replied that he didn't have a box big enough. However, he came through fairly quickly.

Here's the packaging



This is what was inside surrounded by peanuts and shredding



The laser and PSU



The beam shot in a fairly well lit room



The beam is actually multi-mode, but it is still pretty tight and VERY round



It started out at ~39mW, but after warming up it settled in at 43mW for the long haul


I guess my 19mW will be heading for the sales floor soon, eh?

Peace,
dave


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Old 01-23-2010, 09:56 PM #2
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Default Re: My Best HeNe Output So Far

Sweet is all I can say.

So can it pop a ballon?
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Old 01-23-2010, 10:14 PM #3
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Default Re: My Best HeNe Output So Far

I am envious Dave, That is one awesome HeNe.

And to see the beam with lights on and without a big cloud of smoke or fog, That's just impressive.
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Old 01-23-2010, 10:36 PM #4
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Default Re: My Best HeNe Output So Far

Quote:
Originally Posted by photonaholic View Post
I am envious Dave, That is one awesome HeNe.

And to see the beam with lights on and without a big cloud of smoke or fog, That's just impressive.
He's got some smoke for sure.
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Old 01-23-2010, 10:51 PM #5
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Default Re: My Best HeNe Output So Far

Ya know, the more I stare at that beam shot, there is some "help" there.

The evidence lies in the varying intensity along the line. Especially apparent where the wood cabinet is behind the beam.
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Old 01-23-2010, 10:54 PM #6
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Default Re: My Best HeNe Output So Far

More to the fact its only a 43mW red beam. Even a 200mW red beam is hard to see without assistance.
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Old 01-23-2010, 10:58 PM #7
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Default Re: My Best HeNe Output So Far

So far I have never seen a HeNe greater than 6 MW in person.

Even in the dark, I need to add smoke to see a line.
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Old 01-23-2010, 11:49 PM #8
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Default Re: My Best HeNe Output So Far

Yeah thats a monster for a HeNe. I'm sure Dave has a special pillow for it on his bed.

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Old 01-23-2010, 11:57 PM #9
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Default Re: My Best HeNe Output So Far

Quote:
Originally Posted by Tech_Junkie View Post
Yeah thats a monster for a HeNe. I'm sure Dave has a special pillow for it on his bed.


My new Spectra Physics HeNes at 30mW and 50mW respectively indeed have visible beams without any help. 632nm is a lot brighter than 650

I've actually taken it outside and shined it around like a pointer (while probably looking like an idiot) but it was worth it

@ Dave: that's a pretty sweet output, shame you can't enjoy all the beautiful plasma inside the tube
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Old 01-24-2010, 12:16 AM #10
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Default Re: My Best HeNe Output So Far

I didnt think 18nm would make that big of a difference. Do you smoke?
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Old 01-24-2010, 12:25 AM #11
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Default Re: My Best HeNe Output So Far

Quote:
Originally Posted by Tech_Junkie View Post
I didnt think 18nm would make that big of a difference. Do you smoke?
Nope


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Old 01-24-2010, 12:29 AM #12
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Default Re: My Best HeNe Output So Far

Do you use Gold Bond for damp balls?

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Old 01-24-2010, 12:52 AM #13
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Default Re: My Best HeNe Output So Far

well, 18 nm keeping in mind the Gaussian bell in which the visibility is based sounds like a big difference to me, like 3x times!

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Old 01-24-2010, 12:53 AM #14
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Default Re: My Best HeNe Output So Far

Quote:
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Do you use Gold Bond for damp balls?
^^^^^^^^


@ Dave... that's a lot of 632.8 photons... Nice deal..


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Old 01-24-2010, 01:10 AM #15
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Default Re: My Best HeNe Output So Far

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well, 18 nm keeping in mind the Gaussian bell in which the visibility is based sounds like a big difference to me, like 3x times!

If the peak was 100% and 650nm was 5%, it only looks like 3-4% increase to me. But I'm a layman so I could be wrong.
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Old 01-24-2010, 01:51 AM #16
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Default Re: My Best HeNe Output So Far

This is exaggerated, but it's quite visible to the eye - no smoke/fog/powder/anything, except normal dust in the air

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