slight blu-ray issue?

[andy_con]

got a strange one that i cant work out.

got a lavaflexi driver today, connected the 405nm diode and 2x AAA batters, in a normal batt holder.

set the power to 150mw.

then i disconnected the battery pack and installed everything into the leadlight case. put batteries in and the power is 180mw!!!

took it back out the case and connect the same two AAA batts that were in the leadlight case and it measures 150mw.

WTF???

i had to set the driver to 100mw out of the case so when i put it in the leadlight case it measures 150mw?

im using the same two AAA batts in the leadlight case and in the battery pack.

 

[daguin]

 Without seeing your set-up, this is blind guessing.  Is it possible that the beam is very out of focus?  If so, you may not be getting the whole beam onto the detector when you are holding it in your hand.  If so, you are not measuring all of the energy.  Then when you put it into the case, you get it closer to the detector and the entire beam is being measured.  The beam of the blu-ray diodes diverges VERY quickly.

It is better to set the current with a dummy load than to set the output with the diode burning.

Peace,
dave

 

[andy_con]

LOL no thats not the issue.

yeah i know a dummy load is better but im a little lazy.

my setup is the one from my guide

 

[daguin]

LOL no thats not the issue.
my setup is the one from my guide

I'm sorry. I don't see a LPM in your guide

Peace,
dave

 

[danq]

The only ways you could get more power out of the same diode would be to either change the optical environment or increase the current fed to the diode.  

The current could increase if the driver setting was changed; it wasn't regulating properly; or if it were somehow being bypassed.  The driver's operation could be changed when in the case by something shorting in there, but it would have to be shorted in just the right spot, if possible at all. Adding current by bypassing the driver - essentially, making a current path in parallel with the driver - would be difficult to do accidentally, since it's more likely that mounting in a case would increase series resistance.

After looking at your guide, it appears that the most likely problem is some part of the driver circuit board is shorting to the case.  When you trim it down to fit, some of those traces may be  exposed on the board's edge; and it appears you're just shoving it into the Leadlight uninsulated.  Try putting some kind of insulation in there - I'd think normally of heatshrink tubing but that driver needs to dissipate heat so covering it up may not be good... some Kaptan tape on the walls of the host would do it better.

 

[andy_con]

umm didnt think of that.

will look into it cheers