Old 02-23-2016, 11:30 PM #1
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Default Bare tube 594nm HeNe's?

Are there any of these? What do they look like? What kind of duty cycle could one of these handle?


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Old 02-24-2016, 12:41 AM #2
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Default Re: Bare tube 594nm HeNe's?

They look like any other bare HeNe tube for the most part. Some manufactures like REO used a mostly metal tube instead of glass. Duty cycle AFAICT is pretty much infinite though I don't run mine excessively to prolong tube life as much as possible.
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Old 02-26-2016, 01:55 AM #3
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Default Re: Bare tube 594nm HeNe's?

bare tubes in non-red were never really produced due to the excessivly low gain and sensitivity. leaving them out in the open causes the power to be lower due to the cooling effects and air currents. They're built into the black tubes for protection, as well as to help heat distribute evenly across the tube and protect the mirror mounts from moving due to contractions in the metal. even so much as blowing on one has an effect on the power of those larger, lower gain tubes. It affects the red ones too, but alot less so, as the gain at red is alot higher. the gain of the yellow line is only something like 1/15th that of red. so its very very weak by comparison. a 12mW tube or so of red, will only do perhaps 1-2mW of yellow, and only after being optimized with different mirrors, gas ratios and pressures. else, it may not even lase at yellow at all. a bare tube in the open could very well cycle between, low or even no power at all in some cases. They look basically the same anyway, though yellow and greens do tend to have a slightly more pinkish color by a little due to the often lower pressures involved. (and thus a shorter lifespan)

edit: and HeNes have an unlimited duty cycle. they can run indefinitely until the cathode is expended.
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Last edited by ultimatekaiser; 02-26-2016 at 02:00 AM.
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Old 02-26-2016, 10:43 AM #4
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Default Re: Bare tube 594nm HeNe's?

Thanks for the feedback UK. I figured there was a good reason that we don't see these and there damn sure is! Lol
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Old 02-26-2016, 06:07 PM #5
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Default Re: Bare tube 594nm HeNe's?

Yeah. The bare tubes are more made as replacement parts. They're not meant to be run like that. Part of why I like old side arm tubes, as they have external mirrors, and don't have this problem. But finding one working is all but impossible.
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593.5nm CNI MGL-H-50 Lab Laser
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1152.6nm: SP-120 HeNe alt. mirrors
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Last edited by ultimatekaiser; 02-26-2016 at 06:08 PM.
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Old 03-06-2016, 12:43 AM #6
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Default Re: Bare tube 594nm HeNe's?

You've sure have a beautiful wavelength collection Ult Where do you store all of that? Looks like there's hardly a handheld in there.
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Old 03-06-2016, 01:21 AM #7
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Default Re: Bare tube 594nm HeNe's?

It certainly takes up a lot of space....And I don't have a lot of handhelds because I don't particularly care for them. Quality is more important for my use than pure power output. I can do a ton more things with a stable 10-20mW, than with 100mW that's all over the place. That and with bare parts and the know how, I can make my own stuff, or rebuild old things, rather than rely on imports from places like CNI by understanding the science behind it. The downside is that it's much more expensive... But I'm sure many of you'd agree that you get what you pay for. That and many of you already have the tools to make the same things...you just have to spend the time and money to make it happen. Explore, and be creative.

I enjoy handhelds as much as the next guy... But there's tons of other possibilities as well... Don't limit yourself to just one medium. Not every laser one makes has to be able to be carried around. Good things take time to make. I feel like a lot of people here have a lot more potential than making pseudo-flashlights that burn things just because that's what's available easily.
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325nm: Omni 2056-M-A01 HeCd
375nm: Melles Griot RCS-007

405nm: Melles Griot RCS
430nm: Coherent D3 430-10
441.6nm: Omnichrome 2056-M-A01/4074-P-A03 HeCd laser
457.9nm: Uniphase 2214-40MLA Argon Ion Line

472nm Omni-643RYB Whitelight Line
473nm: CNI MGL-473-100, CNI GLP-473
476.5nm: Uniphase 2214-40MLA Argon Ion Line

483nm Omni-643RYB Whitelight Line
488nm: Uniphase 2214-40MLA Argon Ion Line, Spectra Physics >20mW Cyan DECSL Laser

496.5nm: Uniphase 2214-40MLA Argon Ion Line
501.7: Uniphase 2214-40MLA Argon Ion Line
514.5nm: Uniphase 2214-40MLA Argon Ion Line
520nm: Trustfire A8 Custom

532nm: CNI MGL-F-3W, LG Hercules-325
543.5nm: 05-LGR-193 Melles Griot HeNe 3.8mW
Melles Griot LGB-563 HeNe

561nm: Melles Griot 85-YCA-015, Coherent Sapphire 561-20
568nm: Omni-643RYB Whitelight Line

577nm
583.8nm
586.2nm
588.6nm: CNI PGL-M-80

591nm
593.5nm CNI MGL-H-50 Lab Laser
594.1nm: Coherent 31-2230-000 (4.5mW)

604.6nm: LOR-150 HeNe line
609nm REO LHYR-250M HeNe line
611.8nm: Melles Griot LOR-150 HeNe (5mW), LOR-006 HeNe (0.5mW)

632.8nm: Spectra Physics Model-127 (>35mW), Model-124B, Model-120, Model-117, others
Melles Griot LHB-580, LHB-190, WHR-570

641nm: Melles Griot RCS
647nm: Omni-643RYB Whitelight Line
659.3nm: Laser Quantum IGNIS 0.5W

671nm: CNI PGL-III-C-100
676nm: Omni-643RYB Whitelight Line
690nm: custom diode laser
694nm: Portable Q-switched Ruby Laser

1152.6nm: SP-120 HeNe alt. mirrors
1523.5nm: Melles Griot LIR-151 HeNe
3391nm: SP-124 alt. mirrors

Last edited by ultimatekaiser; 03-07-2016 at 04:56 AM.
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