Lightwave Halfnote Green Laser Questions

**Laser Ben** · 10-03-2009, 12:00

Also, Jim, get it off that bag, that is actually a conducing bag and not a standard static dissipative bag.

**smogthemog** · 10-03-2009, 12:02

I think the manual is wrong Ben, it says 0.3v?
Surely that should be 3v?

The diode voltage is 2.6V???

EDIT - the manual says: GREATER than 0.3V

I must learn to read

**smogthemog** · 10-03-2009, 12:07

Ben, I think I have just found the problem.

The umbilical cord

Measuring accross the diode when it's running I get 2.6V at the driver and 1.9V at the laser head!
Its tripping on undervoltage and not overvoltage.

Not good!

It's being removed tomorrow and I am starting a fresh. I had my doubts about it when I first saw it as it is rather long!

**Laser Ben** · 10-03-2009, 12:08

Woah, the diode voltage should not be that high, what is the voltage you get from the diode power supply when it is powered on with the diode running?

I am thinking that you may be getting losses from the wires in the umbilical, causing the voltage to be so high. Perhaps if this doesn't solve it, you can cut the wires down in length and retry, the resistance should not be that high though, the diode should only take ~2V.

**Laser Ben** · 10-03-2009, 12:10

Originally Posted by smogthemog

Ben, I think I have just found the problem.

The umbilical cord

Measuring accross the diode when it's running I get 2.6V at the driver and 1.9V at the laser head!
Its tripping on undervoltage and not overvoltage.

Not good!

It's being removed tomorrow and I am starting a fresh. I had my doubts about it when I first saw it as it is rather long!

I would just cut it down a little, it was a pain in the ass to solder on, and the head has to be opened to unsolder it. That is the same wire that they used in the first place, same model even, just different color.

**smogthemog** · 10-03-2009, 12:22

3.27V across the 2x black and green wires from the PSU.

I am going to shorten it all too 500mm and go from there.

I am loosing 0.9V through the cabling to the TEC

**smogthemog** · 10-03-2009, 12:30

Originally Posted by Laser Ben

Also, Jim, get it off that bag, that is actually a conducing bag and not a standard static dissipative bag.

The inner of the bag is conductive but the outer isn't.

**smogthemog** · 10-03-2009, 12:43

A few more pics showing the test layout, 500Hz square wave generator, and the laser head:

**allthatwhichis** · 10-03-2009, 13:22

but does it pop balloons...?

**Laser Ben** · 10-03-2009, 22:19

He said it was burning the cardboard, so unless those are lead balloons...

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