Does anyone can help me troubleshooting coherent CO2 laser C-30L

Community Laser Talk
1

After five years of usage C-30L Co2 laser from coherent, I have been experiencing reducing in power of the laser,

2

The best we can likely do is help you isolate the issue between the controller and the laser source. I’ve never even seen a schematic of an RF source.

:grinning_cat:

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3

Have you contacted the manufacturer for assistance?

4

Hi Jack,

I highly appreciate if you can help me, the following were the troubleshooting carried out

  1. DC power supply 48VDC is OK
  2. The laser has been set to single shot, with Pulse width: 200ms, Spot size: 3mm, Percentage:15% and tested on a piece of paper, the hole size made was approx. 2.54mm
  3. After one Hour gap, the same test has been repeated as mentioned in 2 this time the spot size is reduced to less than 0.6mm(approx.)

The following are the steps which I am thinking off

  1. Directly to measure the output at the end of the laser tube, for which I need to isolate the optical path.
  2. Open the laser tube and observe for broken parts in the laser and control section
  3. I am looking for some steps in isolating the laser tube from the Optics, open the laser tube.

Best
Srikanth

5

Hi Mikey

I am trying to reach them as well; the response is quite slow from their end. Which is giving me room to troubleshoot it more and understand.

Best
Srikanth

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6

It sounds like the source is just getting weak. I doubt you’ll find anything user repairable. Most of these you need schematics and equipment to see what’s happening.

I’ve never been in one of these sources, so I can’t really judge. It might be overall lower cost to send it back to the manufacturer and have them repair the source.

Sounds odd that the output diameter drops… I’m also not used to working with 900uM fiber, so some of my experience may not be helpful.

When it’s producing a small diameter, can you measure the pwm voltage? It sounds like a source issue, unless there is some change in pwm percentage.

:grinning_cat:

7

Hi Jack

with the model C-30L from coherent, in order to measure the PWM signal, I need to open the laser tube and try to locate the PWN section, having no schematics as well, trying to troubleshooting by asking for help.

8

The pwm is supplied by the controller. You should have access to the pwm at your controller or where it attaches to the laser source.

This is an external control signal, as far as I know, it’s the only control you have over the laser, so I doubt it’s internal.

:grinning_cat:

9

PWM signal looks stable, even if the energy is gradually reducing.

10

If the pwm is correct, whatever is happening is in the laser module itself. I’ve never been into a metal tube source, so I don’t think I can be of much help. These are usually more expensive so most of us don’t own one.

I’d try a note to Raycus or whomever manufactures it and see if they have any kind of local (within your country) customer support or a recommendation of someone that can fix it.

Sorry about that… wish I could be more helpful.

:grinning_cat:

11

Thanks, Jack & all, for your support.

12

Let us know what happens… good luck.

:grinning_cat:

13

definitely will do, I am trying for a broken C-30L laser as well, please let me know if case of any leads for similar broken or obsolete lasers

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