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Old 08-10-2017, 11:30 AM #1
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Default My first Helium Neon LASER!

Finally, after 5 years of searching in my country I found my first Helium Neon LASER!
LASER head model Melles Griot 05-LHP-401, and high voltage power supply is Power Technology Inc. model N017-1111 Its labeled 1365VDC and 5mA
I buyed relatively cheap, about 15 USD laser + 15 USD high voltage power supply, and it work, but beam was very weak. I had a meeting with my local institute for physics, I asked them if could measure power of my laser.
Power was 50 uW (microwatts)
I was disapointed, but the professor reminds me that at least I have working and stable high voltage power supply I got very very cheap.
I put a couple of pictures, beam on wall 20 feet from laser with, and without camera flash (I am impressed of beam brightness only 50 uW)
And that is, my first Helium neon LASER!
Now I am looking for another one at least 5mW I hope to find.
Attached Thumbnails
My first Helium Neon LASER!-my_first_helium_neon_laser.jpg   My first Helium Neon LASER!-he_ne_high_voltage_power_supply.jpg   My first Helium Neon LASER!-12v_power_supply.jpg   My first Helium Neon LASER!-hv_meter.jpg   My first Helium Neon LASER!-beam_measuring.jpg  

My first Helium Neon LASER!-beam.jpg   My first Helium Neon LASER!-beam_on_wall_20_feet_from_laser_without_camera_flash.jpg   My first Helium Neon LASER!-beam_on_wall_20_feet_from_laser_with_camera_flash.jpg  



Last edited by 9A3DAA; 08-10-2017 at 12:07 PM.
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Old 08-10-2017, 11:57 AM #2
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Default Re: My first Helium Neon LASER!

Glad to see that you got your first He-Ne laser, but for some reason, you photos are not showing up, at least for me.
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Old 08-10-2017, 12:46 PM #3
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Default Re: My first Helium Neon LASER!

I was tempted to open the laser head and try aligning the mirrors, and I opened it, and found nice Hughes 3121H-P-02 laser tube.
Datasheet say 0.5 mW minimum...
I powered up the laser and try aligning the mirrors and I loss the beam immediately, but after 10 minuts I got beam back.
Power did not increase.
I noticed that plasma discharge glow orange (loss of helium), and my
camera cant picture orange glow in picture is red but is not
I heard helium soak, and I will try activate getter after helium soak and see if I can get more output.
Attached Thumbnails
My first Helium Neon LASER!-img_20170605_222552.jpg   My first Helium Neon LASER!-img_20170607_171330.jpg   My first Helium Neon LASER!-img_20170607_171340.jpg   My first Helium Neon LASER!-img_20170607_171348.jpg   My first Helium Neon LASER!-img_20170607_171358.jpg  


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Old 08-10-2017, 12:55 PM #4
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Default Re: My first Helium Neon LASER!

The photos are looking good now, nice clear, detailed pics!
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Old 08-10-2017, 05:34 PM #5
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Default Re: My first Helium Neon LASER!

Quote:
Originally Posted by 9A3DAA View Post
Finally, after 5 years of searching in my country I found my first Helium Neon LASER!
LASER head model Melles Griot 05-LHP-401, and high voltage power supply is Power Technology Inc. model N017-1111 Its labeled 1365VDC and 5mA
I buyed relatively cheap, about 15 USD laser + 15 USD high voltage power supply, and it work, but beam was very weak. I had a meeting with my local institute for physics, I asked them if could measure power of my laser.
Power was 50 uW (microwatts)
I was disapointed, but the professor reminds me that at least I have working and stable high voltage power supply I got very very cheap.
I put a couple of pictures, beam on wall 20 feet from laser with, and without camera flash (I am impressed of beam brightness only 50 uW)
And that is, my first Helium neon LASER!
Now I am looking for another one at least 5mW I hope to find.
What type of Laser Power Meter did you use
to test the Power output ???
It could be the Tube is past it's useful life.

Jerry
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Last edited by lasersbee; 08-10-2017 at 05:37 PM.
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Old 08-10-2017, 05:48 PM #6
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Default Re: My first Helium Neon LASER!

I don't know model, but it was coherent handheld power meter
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Old 08-10-2017, 05:49 PM #7
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Default Re: My first Helium Neon LASER!

Quote:
Originally Posted by lasersbee View Post
What type of Laser Power Meter did you use
to test the Power output ???
It could be the Tube is past it's useful life.

Jerry
I think that might be the case - the tube output color is much more red than the normal muted orange, which might imply abnormal conditions are in play.
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Old 08-10-2017, 05:51 PM #8
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Default Re: My first Helium Neon LASER!

my camera can't picture orange glow in picture is red but IS NOT RED
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Old 08-10-2017, 05:53 PM #9
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Default Re: My first Helium Neon LASER!

Quote:
Originally Posted by Sta View Post
I think that might be the case - the tube output color is much more red than the normal muted orange, which might imply abnormal conditions are in play.
Cameras don't always pick up the colour at all accurately.

Quote:
Originally Posted by 9A3DAA View Post
my camera can't picture orange glow in picture is red but IS NOT RED
^^Yup. Not all cameras capture the colour well.

Quote:
Originally Posted by 9A3DAA View Post
I don't know model, but it was coherent handheld power meter
Sounds like a LaserCheck.
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Old 08-10-2017, 05:59 PM #10
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Default Re: My first Helium Neon LASER!

Quote:
Originally Posted by diachi View Post
Cameras don't always pick up the colour at all accurately.
Very true diachi. This is the bane of anyone who owns a 561
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Old 08-10-2017, 08:58 PM #11
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Default Re: My first Helium Neon LASER!

For $15.00, you are lucky to have a tube that lases at all. And that PS will come in handy when you get a tube with fewer miles on it. I would call this a win for a total of $30.00.
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Old 08-11-2017, 02:06 AM #12
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Default Re: My first Helium Neon LASER!

Is it a soft seal tube? Hard seal tubes that are frit sealed do not leak on any timescale that matters (usually). If it is epoxy sealed, then loss of helium is a pretty likely or reasonable explaination. There's no real cure for it for tubes this short. They use the special light isotope Helium He-3, not normal He-4. and it takes weeks of work to soak it enough to make a difference. not worth it - don't waste your time. It looks like there's a faint black shadow over your getter, so it's probably intact, just old. I have a bunch of these old Hughes tubes, and alot of them dont work unless they're hard sealed ones. If you want a small HeNe, I have a whole box full of different ones I'm surprised that it lights at all on that power supply, it seems a bit weak for that tube. the 3121s are usually around 2KV at 6.5mA when healthy. I dunno if one that low would run a good one. 1365V is more for the little 6" tubes.
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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: Argon Ion Line

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

483nm Omni-643RYB Whitelight Line
488nm: Argon Ion Line, Spectra Physics >20mW Cyan DECSL Laser, Coherent Sapphire 488-20 OPSL

496.5nm: Argon Ion Line
501.7: Argon Ion Line
514.5nm: Argon Ion Line
520nm: Trustfire A8 Custom

532nm: CNI MGL-F-3W, Coherent Genesis MX Taipan OPSL, 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: Coherent Genesis MX Taipan OPSL
583.8nm: DPSS line
586.2nm: DPSS line
588.6nm: CNI PGL-M-80

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

604.6nm: LOR-150 HeNe line
609nm: Raman 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
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641nm: Melles Griot RCS
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671nm: CNI PGL-III-C-100
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690nm: custom diode laser
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1152.6nm: SP-120 HeNe alt. mirrors
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3391nm: SP-124 alt. mirrors

Last edited by ultimatekaiser; 08-11-2017 at 02:08 AM.
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Old 08-11-2017, 10:58 AM #13
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Default Re: My first Helium Neon LASER!

Quote:
Originally Posted by ultimatekaiser View Post
Is it a soft seal tube? Hard seal tubes that are frit sealed do not leak on any timescale that matters (usually). If it is epoxy sealed, then loss of helium is a pretty likely or reasonable explaination. There's no real cure for it for tubes this short. They use the special light isotope Helium He-3, not normal He-4. and it takes weeks of work to soak it enough to make a difference. not worth it - don't waste your time. It looks like there's a faint black shadow over your getter, so it's probably intact, just old. I have a bunch of these old Hughes tubes, and alot of them dont work unless they're hard sealed ones. If you want a small HeNe, I have a whole box full of different ones I'm surprised that it lights at all on that power supply, it seems a bit weak for that tube. the 3121s are usually around 2KV at 6.5mA when healthy. I dunno if one that low would run a good one. 1365V is more for the little 6" tubes.
As I know Helium 3 isotope is very expensive, and its used in neutron detectors in nuclear physics

Last edited by 9A3DAA; 08-11-2017 at 10:59 AM.
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Old 08-11-2017, 12:58 PM #14
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Default Re: My first Helium Neon LASER!

Would probably be less expensive to get
another working tube.

Jerry
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