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Old 06-02-2010, 10:02 PM #17
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Default Re: My Newest HeNe Toy

Yes its been done. Use a V shape. Powers to 300 mW using specially shaped bores, since HENE mixes need wall collisions to depopulate the lower level.

Ie the bore is star shaped or elliptical for more wall collision area.

Steve


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Old 06-07-2010, 07:50 AM #18
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Default Re: My Newest HeNe Toy

Hi Dave,
Another question if I may.....
With these 390T HeNe power supplies, mine doesn't have a trimpot so I can't adjust the output. Not sure if yours has it or not. I was wondering if you connected such a beefy PS to a smaller tube, will it damage the tube or will the tube/power supply only allow the required amount of current to flow through the tube?
Cheers,
Rob.
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Old 06-07-2010, 07:33 PM #19
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Default Re: My Newest HeNe Toy

Quote:
Originally Posted by timelablasers View Post
Hi Dave,
Another question if I may.....
With these 390T HeNe power supplies, mine doesn't have a trimpot so I can't adjust the output. Not sure if yours has it or not. I was wondering if you connected such a beefy PS to a smaller tube, will it damage the tube or will the tube/power supply only allow the required amount of current to flow through the tube?
Cheers,
Rob.
Mine does not have an accessible pot.

You can damage the laser with too much current.

Also, the tubes output actually goes down with over-powering.

Peace,
dave
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Old 06-07-2010, 08:09 PM #20
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Default Re: My Newest HeNe Toy

Quote:
Originally Posted by LSRFAQ View Post
Yes its been done. Use a V shape. Powers to 300 mW using specially shaped bores, since HENE mixes need wall collisions to depopulate the lower level.

Ie the bore is star shaped or elliptical for more wall collision area.

Steve

I remember doing a U shaped 3 tube folded-cavity 20 yrs ago, alignment is a nightmare without special mounts and a super stable table.
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Old 06-07-2010, 11:33 PM #21
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Default Re: My Newest HeNe Toy

That laser is fantastic.

I've been wanting a long HeNe like that for a very long time. Great find.

-Trevor
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Old 06-08-2010, 07:59 AM #22
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Default Re: My Newest HeNe Toy

Quote:
Originally Posted by LSRFAQ View Post
Yes its been done. Use a V shape. Powers to 300 mW using specially shaped bores, since HENE mixes need wall collisions to depopulate the lower level.

Ie the bore is star shaped or elliptical for more wall collision area.

Steve
As far as i remember, the efficency of He-Ne is also affected from the lenght of the cavity ..... and also, these units have external mirrors to play with ..... i was just wondering about an experiment .....

Coupling them in U shape from the back mirror, matching the total lenght of the cavity with the wavelenght, and also coupling the two beams with a combiner, coupling also here the waves ..... must be a nightmare inside a nightmare, to do, but at the end, the power can be unbelievable, for a He-Ne system .....
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Old 07-13-2010, 01:10 PM #23
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Default Re: My Newest HeNe Toy

Quote:
Originally Posted by daguin View Post
Mine has three @ 27K ohm each (total 81K ohm)

Peace,
dave
Hi again Dave.
Are all three resistors on the same end of the tube, and if so, what end are they connected to on this type of tube?
Many thanks again!
Cheers!
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Old 07-14-2010, 10:23 PM #24
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Default Re: My Newest HeNe Toy

I'm RED with envy

But seriously... I really want one.
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Old 07-15-2010, 09:35 AM #25
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Default Re: My Newest HeNe Toy

Really nice HeNe Dave... sigh, ah, the memories... congratulations!
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Old 07-20-2010, 12:34 PM #26
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Default Re: My Newest HeNe Toy

Beautiful piece of equipment!!!

I view gas lasers like these as an art-form. They're beautiful: like old radios from an era when technology had visual appeal and personality.

Jarrod
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Old 07-21-2010, 03:28 AM #27
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Default Re: My Newest HeNe Toy

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I view gas lasers like these as an art-form. They're beautiful: like old radios from an era when technology had visual appeal and personality.
I couldn't agree more. A big old gas laser like this looks like what a laser should look like! Big, elaborate glass tubes, glowing electric discharges, huge power resistors and other weird components. DPSS lasers can be so boring to look at; a bunch of rice-grain sized bits of glass epoxied together and crammed into a heatsink.
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Old 07-21-2010, 08:05 AM #28
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Default Re: My Newest HeNe Toy

Quote:
Originally Posted by Event_Horizon View Post
I couldn't agree more. A big old gas laser like this looks like what a laser should look like! Big, elaborate glass tubes, glowing electric discharges, huge power resistors and other weird components. DPSS lasers can be so boring to look at; a bunch of rice-grain sized bits of glass epoxied together and crammed into a heatsink.
Couldn't have phased it better myself.....
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50 x HeNe Lab, Head, bare tube 1-35mW 632.8nm
1 x ArKr Omnichrome 100mW 568nm
12 x DPSS Lab and module style 10-100mW 532nm
3 x HeNe Heads 1-5mW 543.5nm
12 x Ar Ion 20-80mW 488nm
2 x DPSS 10-20mW 473nm
2 x Ar Ion 25 & 100mW 457-514nm Multilines
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