Laser PSU questions...

[WilliamD]

I was wondering how fast the laser beam power is affected by varying the voltage to the power supply? If I'm running at 100%, then cut it to 50%, how soon will the beam reflect the change?

[KTP]

A very good question. I know some laser manufacturers specifiy rise times (usually around 50 to 150usec for RF lasers) but I am not sure of the fall time. I suspect the laser gas will remain energized for some small amount of time after the stimulous (hv dc or rf energy) is removed. Maybe a few usec to 100usec? (total guess)

[smartcut]

Hello !

I made some mesurements on my own CO2 laser that answer your question. I need to send you two .bmp diagrams ...

Are you able to give me an e-mail ?

Regards.

Philippe

[WilliamD]

Sure! it's willmiss20@hotmail.com. Thanks again!

[smartcut]

I sent you a message on your e-mail ... I hope the diagrams are not to big ...

Tell me if you received them ...

Thanks !

[fractaledge3]

Originally Posted by smartcut Hello ! I made some mesurements on my own CO2 laser that answer your question. I need to send you two .bmp diagrams ... Are you able to give me an e-mail ? Regards. Philippe

Hi

Can you send me a copy of the diagrams.
Also do you minde to post the diagrams here

Thank you

[WilliamD]

The diagrams are great! I have cable so I don't mind the size, but 2 and 3 megs would be a bit much to post on this site. I'm not sure how you'd size them down. But thanks again!

[fractaledge3]

Originally Posted by WilliamD The diagrams are great! I have cable so I don't mind the size, but 2 and 3 megs would be a bit much to post on this site. I'm not sure how you'd size them down. But thanks again!

Hi

You can zip it (right click on the file -> select "send to" -> select "compress (zipped) folder"

or you can open the bmp file ->save as jpg file "this can reduce the size"

[smartcut]

(Message copy)

See attach files

Hello !

I hope these diagrams may help you. My laser is a 10W max power, but I use it
at a lower power (6W RMS).

The laser is powered with a 14.4 kV (max) double-wave unfiltered generator
through a 680 kOhm ballast resistance.

I assume that :

- the triggering voltage is equal to the cutting voltage (to simplify)
- the laser efficiency is 10 % (I have no optical power mesurement device)

I believe you can extrapolate to a bigger laser.

On the diagrams, "eff" is RMS.

Best regards !

Philippe

[smartcut]

In addition :

On the first diagram, the intensity seems to become negative. Of course not ! The automatic scale of the diagram software is the reason of that !