Greenie modulation question

[absolom7691]

Hello all,

I am looking at getting a 50 mW greenie. The unit I have in mind, the laser head itself has only 2 drive wires going to it, nothing else. This has a TTL PSU. I am wanting to make this head analog by using a FlexMod driver. I should be able to ditch the PSU that this unit comes with and just use the FlexMod, provided I check the operating current of the diode while rinnung, correct? Can someone let me know if I am on the right track here?

I currently have a TTL 150+mW greenie, but the head has a multi-conductor cable. I have no doubts this is for light monitoring, TEC colling/heating, power for the cooling fan... Is it fesable to convert this to analog, or is this more difficult?

Thanks for any help!

[swamidog]

absolom, this is no problem. i did the same mod a few months ago:

http://scrye.com/wordpress-mu/monkey...ue-conversion/

pm me if you have any questions. i'm happy to help.

Hello all,

I am looking at getting a 50 mW greenie. The unit I have in mind, the laser head itself has only 2 drive wires going to it, nothing else. This has a TTL PSU. I am wanting to make this head analog by using a FlexMod driver. I should be able to ditch the PSU that this unit comes with and just use the FlexMod, provided I check the operating current of the diode while rinnung, correct? Can someone let me know if I am on the right track here?

I currently have a TTL 150+mW greenie, but the head has a multi-conductor cable. I have no doubts this is for light monitoring, TEC colling/heating, power for the cooling fan... Is it fesable to convert this to analog, or is this more difficult?

Thanks for any help!

[absolom7691]

Thank you! I will definitely hit you up if I have questions. I had thought about trying to mod my 150mW greenie, but I am currently building a RGB projector and I only have a 250mW 650nm and 100mW 473nm so, 150mW of 532nm would be a touch much. 50mW should settle in nicely!

[badger1666]

i also did this conversion but does not modulate very well in analog mode
laser power all over the place
ie ,as a test i put a pot on the analog input fed it 5v and tured it up slowly
laser output to start with was low then you would get to a point it would suddenly shoot up
to nearly full power
put the green in a rgv projector and the result were not that good, ok but not great
did you have any such trouble ??
if so how did you get around it ?
cheers
chris

[absolom7691]

I am wondering if this is due to thermal fluctuation. I know on the cheap green pointers (Not saying your laser was cheap) they suffer the most from this. I have a green pointer and when it is physically cold, the output is very low and as the unit warms up, the power jumps around a lot and finally stablizes. It was even to the point where, if I would warm it in my hand, it would come on at full power. I know some of the greenies have TEC heating to keep the KTP and nd:yag or yvo4 at a constand temp.