80-100mW Green China laser

[Fenechlaser]

well, with this green, i had really good results with just two LOC815, driven conservatively around 200ma.
not so complicated or costly, maybe you should consider it

I was hoping for improvement on the Mitsubishi 300mWs.... At 100euro each, the openext are a bit expensive for my budget... anyway, what isn't expensive in this hobby:P I was considering using two lpc836 with moderate TEC cooling to try and shift the wavelength and to overdrive these diodes a bit. I was thinking of later upgrading this green module, but for now, it will definitely stay..

And thanks for the suggestion

[hakzaw1]

thanks for all that--well done- the conversion to analog was excellant info. more please

[Fenechlaser]

Hi people,

if anyone of you (above) have done the analog mod and have a power meter, could you do a mA against mW power plot. I know cheap greenies are not known for their linear modulation - and all DPSSs' for that matter (except the reaaly pricey ones ), but it would be nice to know how linear this laser would be under analog mod. I do not own a power meter. And as for a previous post, I will try and look into the current - was thinking of reading it across the 2 ohm shunt - it should be pretty accurate. In the end I wish to design a small pcb with SMD components and make it available free for others to be able to modify this little greenie. If modulation would be somewhat linear, then it would be an added bonus

Thanks in advance

[Fenechlaser]

I have one exactly the same (buy it from O-like).

Just out of curiosity, is the laser head rectangular or square-ish when viewed with the laser pointing towards you (and not your eye )?? In all the o-like pictures, it appears to be rectangular (base is wider than height)

Thanks

[LaNeK779]

mine is rectangular. you can't say it is square, not even close.

i haven't done the analog mode so i can't help you with this one. but even ttl, it appears to behave much better than expected (dare i say "semi-analog"??), so i have a feeling there is hope with this one

[megaton]

Hi
I just check it, its rectangular.

Cheers,
Ed
BTW mine some times get dim for a wile
And later are fine again. (hoping?)

[Fenechlaser]

Thanks for the replies. I managed to map out the driver circuit and currently discussing with a friend of mine how to modify the already present driver to be analog. For now, those who have enough patience with SMD and want to remove the annoying inverted chinese modulation; simply unscrew the top board and start by desoldering all the wires from the additional PCB to the PCB proper. Then get a 100 ohm SMD resistor and solder it in the position labelled R26 (situated on top of the potentiometer closest to the connector pins). Then solder a 10K SMD resistor on the pads where the yellow wire was soldered to. This would result in laser output when the input is equal to 0.65V - a bit low and only TTL, but NOT some STUPID inverted chinese TTL..

[Fenechlaser]

Mod finally finished Enjoy the fruits of my labour :P