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[Elektrotechniker]

LPC running at 360ma..........

power?

 

[millirad]

~240mW, but thats an estimate. I don't have a Kenometer or other LPM. It's running with an AR glass lens.

 

[millirad]

Another LPC is running as of late last night, at 200ma. I will put a brass heatsink on and bump that to 380ma. Thanks Glenn! I have been putting the key turn interlock/switch on the back end of all of my lasers now. It looks cool and provides some level of safety. This way it takes a little more fore-thought to energize the beam.

 

[millirad]

Put the brass heat sink on and bumped my diy DDL driver to 380ma. That is one hot beam and I'm feeling really confident to turn a sled into a high power pointer now. It's a great feeling isn't it?

 

[millirad]

That LPC has been bumped to 400ma. That should be enough. I have way too many current sense resistors in parallel on my DDL driver to get 400ma. I'll be getting some .47 ohm 1/4 watt resistors to fix that problem. The beam is certainly visible and the spot is too bright any closer than 15 feet without protective eye wear.

 

[millirad]

Bumped it up to 420ma and I think that will stay. I got a hold of some .12 ohm 1w resistors and some 100 ohm trimpots. Now one resistor and one trimpot to get as much current as I need on the current sense position on my diy DDL driver. I'm using two 3 volt cr123 lithium in series to power up.

 

[millirad]

I attached a 5/8 inch diameter lens to the front of the LPC with AR glass lens. 4 inches in front of the laser I get a .2mm dot that smokes anything in its path. The DDL driver is bumped up to 470ma now. I should switch from brass heatsink to a copper one. Time to get the lathe fired up. I'm using a duty cycle of 10 seconds with the current overspec'd like that. It's a purpose built burner at the moment. If I had to guess, an LPM would register well over 5 watts on the focused beam spot. Anyone ever use their LPM with a focused spot just to find out?

 

[scopeguy20]

Hey pal, it must be awesome!! I don't think it c/b 5 watts, but the output measurement is not different from smaller or larger spot size. you may be burning with 320 mW or so, and with a nice tight dot, it will burn very well indeed! Great work! -GH

 

[millirad]

Alas, finally it bit the dust running at 470ma, when the laser diode received a reflection from a lens I pulled from the sled. It was a freak and would have lasted a long time I believe if not for seeing it's own reflection. Good thing Glenn has moar for us in the near future. ;-) Edit: I believe that when an LOC is running at high output it is at it's most vulnerable state for being killed with its reflected beam. Just my humble opinion.