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Old 11-03-2016, 01:05 AM #17
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Default Re: Why HeNe?

Here's one of my 1mW GreeNes



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Old 11-04-2016, 01:33 AM #18
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Default Re: Why HeNe?

Enlarged like that it looks all over the place indeed. I wonder what the beam actually looks like to the naked eye though. It might not even be noticable at first glance since the failure is fairly elegant, not 'splitting in half' like TEM01 on diode lasers.
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Old 11-04-2016, 03:57 AM #19
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Default Re: Why HeNe?

That's because of what's causing the modes. It's not multimode like a DPSS laser because of the lack of internal surfaces. The mode hopping in this case is generally from distance. The bore is typically widened and the distancing between mirrors is lengthened relative to their curvatures in these lasers, causing the beam to not be aperture limited. So it maintains a circular shape, causing a symmetrical multi-reflection instead. It's easily observed and played with when you have an external mirror tube.
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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: 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
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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
Melles Griot LHB-580, LHB-190, WHR-570

641nm: Melles Griot RCS
647nm: Omni-643RYB Whitelight Line
659.6nm: Laser Quantum IGNIS DPSS laser 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
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3391nm: SP-124 alt. mirrors
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Old 11-05-2016, 02:05 AM #20
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Default Re: Why HeNe?

Aperture limiting certainly helps when it comes to output beam looks.

I think i've played with an external-mirror HeNe only once, and on that the adjustment seemed to be 'on or off', where getting it to lase at all was finicky enough.

I supposed that was far beyond the days of the HeNe lasers though as a diode powered pointer was used to get the course adjustment right
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Old 11-05-2016, 04:43 AM #21
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Default Re: Why HeNe?

haha yeah you can use another laser as a guide, or if you're really good you can do it without. there's a few tricks that can be done to do it manually if you're clever
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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: 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
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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
Melles Griot LHB-580, LHB-190, WHR-570

641nm: Melles Griot RCS
647nm: Omni-643RYB Whitelight Line
659.6nm: Laser Quantum IGNIS DPSS laser 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
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Old 11-06-2016, 01:22 AM #22
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Default Re: Why HeNe?

I'm sure there are, i was just surprised how difficult aligning those external mirrors actually was. The again this was just playing with the thing and a big 'whoohoo' moment when you tuned the mirrors just so a laser beam came out
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Old 11-06-2016, 01:35 AM #23
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Default Re: Why HeNe?

Yes the mounts are very very very sturdy and precise. Usually 80 to 100 something threads per inch... And something like a quarter of a turn is the entire range of lasing! If you just randomly fumbled around for a beam your chances of finding it without knowing what you're doing would be probably greater trying to win the lottery!
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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: 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
Melles Griot LHB-580, LHB-190, WHR-570

641nm: Melles Griot RCS
647nm: Omni-643RYB Whitelight Line
659.6nm: Laser Quantum IGNIS DPSS laser 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
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Old 12-26-2016, 11:48 PM #24
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Default Re: Why HeNe?

Here's my green He-Ne pointer mode hopping.....
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Old 12-27-2016, 01:16 AM #25
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Default Re: Why HeNe?

That almost seems to be giving a class on exotic atomic shell desnsities in the process

Then again, getting the green line to lase on a HeNe is much more difficult that getting the 'default' 633 nm line.

I'm not sure they even sell those kits anymore with the populatiry of laser diodes, but somehow i'd like to have one of them just to see if can still make it work, despite the rather low ouput power (1 mW for the win on that).
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Old 12-27-2016, 01:26 AM #26
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Default Re: Why HeNe?

Quote:
Originally Posted by Benm View Post
That almost seems to be giving a class on exotic atomic shell desnsities in the process

Then again, getting the green line to lase on a HeNe is much more difficult that getting the 'default' 633 nm line.

I'm not sure they even sell those kits anymore with the populatiry of laser diodes, but somehow i'd like to have one of them just to see if can still make it work, despite the rather low ouput power (1 mW for the win on that).
Ther wasn't a diode when Metrologic build the pointer. I bought their "Build a Laser kit" back in 88' a red 1/2Mw and still have it today. The green laser pointer was around 800-900 bucks at the time I bought my kit. I can posts some pictures later if you want.
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Old 12-30-2016, 04:45 AM #27
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Default Re: Why HeNe?

Quote:
Originally Posted by n2stuff View Post
Ther wasn't a diode when Metrologic build the pointer. I bought their "Build a Laser kit" back in 88' a red 1/2Mw and still have it today. The green laser pointer was around 800-900 bucks at the time I bought my kit. I can posts some pictures later if you want.
yup. DPSS has come along way. I have one of the first major lab lasers that was a simple green back in the early 90s. did 150mW when new, and was $xx,xxx.xx dollars back then, and is huge. now you can buy the same thing for a few grand if that, and is far more stable and simple, and fits in the palm of your hand. It's quite impressive.

I think I remember seeing HeNe kits a long time ago, they were quite interesting, though of course, the tube is already made, as it takes huge effort to make one. even a small one is hundreds of dollars even today. let alone back in the 70s and 80s in their prime.
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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: 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
Melles Griot LHB-580, LHB-190, WHR-570

641nm: Melles Griot RCS
647nm: Omni-643RYB Whitelight Line
659.6nm: Laser Quantum IGNIS DPSS laser 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; 12-30-2016 at 04:47 AM.
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