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Old 06-10-2016, 10:47 PM #1
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Default Quick Question for CO2 Lasers

So I was firing up my CO2 Laser again, and I accidentally connected the leads backwards. Realized my stupid mistake within 10 seconds, turned the PSU off and put the leads back on in the right direction. The laser seems to still run perfectly normally. I would assume this did some small amount of damage to the reflective mirror at the non-business end? I couldn't see any damage by inspection though.

How bad is this for the laser tube?


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11 mW 405nm ebay pen
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1.77W 445nm WF-501B (G9) Blord build

10 mW on idle, 140 mW on full: Uniphase Cyonics 2201D-40MLA 6-line Argon 457.9nm 476.5nm 487.986nm 496.5nm 501.7nm 514.5nm
55 mW 532nm Fasttech module in Powerlight B50 build
76 mW 532 nm DX pen

My favorite:
~1400 mW avg. 532nm CNI MGL-H-532 Labby from Styro: Divergence is an insane 0.87 mRad

3.4 mW HeNe 594.1nm Coherent 31-2230-000
2 mW HeNe 632.8nm from Daguin

815 mW 650nm Labby from Styro
211 mW 661nm Single Mode Diode build in Powerlight B50 host (spectral width ~5nm)

220 mW dual peak 800nm/808nm Pen

40W 10.6 Ám CO2
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Old 06-11-2016, 12:14 AM #2
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Default Re: Quick Question for CO2 Lasers

For that brief a run it probably did little to no harm, but it puts stress on the supply and electrodes as the electrical and heat distribution properties change.
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375nm: Melles Griot RCS-007

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Old 06-11-2016, 12:27 AM #3
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Default Re: Quick Question for CO2 Lasers

With direct current discharge, the anode will have a different heat load than the cathode. Electrons bombard the anode, and ions bombard the cathode. Ions hit harder (causing electrode sputtering in the long term), but less often because they often hit other ions and lose energy first. Electrons on the other hand flow freely, and will heat the anode more.

Reverse polarity is harmless for a few seconds. It might even be fine indefinitely if the electrodes are identical and equally cooled.
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Old 06-11-2016, 09:17 PM #4
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Default Re: Quick Question for CO2 Lasers

Quote:
Originally Posted by Cyparagon View Post
With direct current discharge, the anode will have a different heat load than the cathode. Electrons bombard the anode, and ions bombard the cathode. Ions hit harder (causing electrode sputtering in the long term), but less often because they often hit other ions and lose energy first. Electrons on the other hand flow freely, and will heat the anode more.

Reverse polarity is harmless for a few seconds. It might even be fine indefinitely if the electrodes are identical and equally cooled.
That is good to hear
Definitely will triple check the connections from now on. And not operate the laser with only 4 hours of sleep.
__________________
11 mW 405nm ebay pen
550mW 405nm 12x 501B (G9)

2.8W 445nm Arcane by Thejoker301
1.77W 445nm WF-501B (G9) Blord build

10 mW on idle, 140 mW on full: Uniphase Cyonics 2201D-40MLA 6-line Argon 457.9nm 476.5nm 487.986nm 496.5nm 501.7nm 514.5nm
55 mW 532nm Fasttech module in Powerlight B50 build
76 mW 532 nm DX pen

My favorite:
~1400 mW avg. 532nm CNI MGL-H-532 Labby from Styro: Divergence is an insane 0.87 mRad

3.4 mW HeNe 594.1nm Coherent 31-2230-000
2 mW HeNe 632.8nm from Daguin

815 mW 650nm Labby from Styro
211 mW 661nm Single Mode Diode build in Powerlight B50 host (spectral width ~5nm)

220 mW dual peak 800nm/808nm Pen

40W 10.6 Ám CO2
5W OPHIR Nospin LPM
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