Does this mean that 700mw + laser builds are possible with one of these?
Not necessarily.. It just means there are no kinks up to that power
or possibly even higher! (see guys, the manufacturers torture them as well, why shouldn't we?)
I also tested some of my GGWs and the 100mW Nihia to WAY above their pulsed powers! They all still work, but i later reduced the current back down to a safe(er) level, cos i like my lasers to last...
Problem is, these kinks - if they even exist with 12x's - HAVE to be FAR outside ot the diode surivability range! Because starting with GGWs, the PI plot is a straight line right until the diode dies! You can't even plot it to the power where the kink is without killing it (unless it was done pulsed).... :angel:
I wonder if kinks - when the diode is pulsed - look the same on the PIV plot as the ones we find in CW plotting - Like where on the PIV Plot = position / shape of the kink, beam profile - how the spot splits into "two" (mode-"hopping").... Maybe you can only push the diode to it's kink in pulsed operation, which is why we don't see them anymore...
Otherwise, the reason a diode HAS to be kink free up to way above it's rated pulsed power is, that if there was a kink underneath, the writing of the disk would fail!
All diodes from 105mW CW/210mW pulsed ratings and higher were somehow kink-free - even when pushed beyond the pulsed power in CW!
First the GGW then the 100mW/200mW Nichia... You can push them to death and not find a kink! I have even seeen it with a BDR-F03 diode!
It must be at least 80mW to 100mW in CW! :thinking: Why would they put a 6x-like diode in a 2x sled?!? Maybe it's just another manufacturer's 6x diode!
If the F03 is a 2x writer, it's really weird! Cos to me it seems to be at least as good as a GGW, but i'm cycling them all soon anyway.... :evil:
BTW,
Dave, yur freak could theoretically die during my re-plot! If it does, it was just a matter of seconds anyway! :angel:
So my question to you is how far i can plot the ""Freak" BDR-F03?
Now the 8x's.. The plots again just keep going in a straight line, at some point it could end in death without warning if we go too far!
Basically we don't have any indication as to where to stop pushing! But the 500mW diode from Sharp has a kink again?!? Or did it say
at least to 700mW? If so it's likelly (could be) yet another kinkless diode to the point where it dies..
The lack of kinks is the reason we can set them to such absurd powers! Basically we are just trading some of those 1000h+ for more power!
And since 1000h+ is at 80°C, while we usually keep them cool with our heatsinks, this also helps prolong the life a little - they degrade faster with heat, as shown in the diode datasheets...
But the point should not be to overdo it, but at least to learn the MINIMUMS of how long they can last at the powers we use or maybe even to see if there is room for more power!! People could then chose "preciselly" (diodes vary of course) how much of the diode life time they are willing to sacrifice, if they want to go for a higher power! If someone is happy with 25h, they can up the current, if someone wants the laser to last longer than that.... It's up to the individual builder/buyer. The cycler tests will tell us what we need to know... :yh:
For example, if 400mW survives my Cycler for a "year" (= accelerated year of normal use - 100h), we could always go for 500mW too, if we are willing to get a 25-50h laser...
And while 25-50h doesn't sound like much, with most people using a relativelly short duty cycle, 25-50h takes a LONG TIME to reach!
I'll prepare some usage calculations, to convert average daily laser use into months (and hopefully years), using the laser use habbits of this forum.
I think i did that once already, but i don't remember where i put it... :yabbem:
Only the PHRs (and some even weaker diodes) were ever exhibiting kinks (oh and one GGW i found!), and set above these kinks they often died rapidly (1-15 hours)... But that was because we were overdriving them to three or even five times their rated CW power... (
good times)
But a 12x kink-free to 700mW doesn't really mean much. It would probably be possible to make a 700mW laser out of it, but it too could die way too soon... Possibly even during plotting!
If anything, they seem to be capable of PULSING to 700mW, meaning it can
probably/possibly do it in CW too... :angel:
But god only knows for how many minutes... :undecided:
