GGW-H20L 6x Sled GB!!! THE EPIC GB THREAD LAWL!!!

[Ace82]

Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

red laser built! VERY nice diode!

 

[Spyderz20x6]

Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

red laser built! VERY nice diode!  

I built a crappy box style laser with it
Didn't have any ideal hosts ;D

 

[jayrob]

Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

But I can say one thing for sure: that red LD is a tough little bugger!!

Nice data. 1.2 Amps!

Wow...
Jay

 

[thesk8nmidget]

Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

hahah its now up to 191mw's  

and here are some pictures of my setup.. the TEC is not plugged in or powered up in anyway.

this is strictly just the heat sink.

well now some bad news... it died

here is the graph. sorry the graph doesnt show the death, the 9 volt battery died on my meter. but i now have a wall plug for it so that wont happen again.

its weird it was a completely flat 160mw for about 2 minutes then shot up to 175 within a few seconds! then kept climbing. the module never even got warm or anything.

now when i went to lunch i came back and the laser was still strong but the meter battery died it was about 1 and a half hours til it died

 

[danq]

Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

nice... it's photos like those that keep me from posting shots of my workspace...

DanQ

 

[IgorT]

Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

Oh crap!

Well, the climbing power could be the cause of death.. I was expecting 160-170mW, not 191mW, which translates to ~245mW raw output (guesstimated). But the question is, why did the power climb? What driver did you use for this test? How sure are you of the stability of current?

Usually, when i saw PHRs climb in power, it was always temperature related. It doesn't have to get noticably warm or even hot for this to happen. The difference between 20 and 24°C could cause a 10mW climb on the weird diodes, that climb with temperature. If i let them run till they reached 25°C or if i put them in the pocket till they reached 25°C, the results were the same.

Several experts speculated, it could be a mirror alignment thing, because the actual efficiency of the diode can not climb with heat.


But 90 minutes is not very encouraging.  :-/

I sure hope not all of them climb with heat.

 

[styropyro]

Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

I just got all of the diodes out of their heatsinks, the blu was a little tricky but I got through it. What's left of the sled is a torn mess. ;D I sawed my way through everything so it looks like crap, but it doesn't really matter because it is going to be burned anyway. There are a ton of nifty little optics in this thing, I lost one of the beefier ones because it flew across my garage at high speeds when I clipped it out of its heatsink looking thing. I wish I could scrape up enough cash for another one of these sleds. :

 

[rkcstr]

Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

I was able to get my diode out pretty simply. First I removed the strange glass lens thing in front the diode, then I clipped the small tabs behind the back of the diode, then I took the small brass fitting I typically use for removing a diode from Aixiz modules and it fit right in the front of the heatsink piece. Then, I used the module's focus ring behind the diode and used a vise to press the whole assembly, pushing the diode out of the heatsink. It requires VERY little movement, so don't press too far or you'll smash and possibly break the diode pins, unless you have a deeper part behind the diode.

All and all, though it sounds complicated, it was much simpler than trying to cut the heatsink apart and probably safer for the diode since those vibrations may not be good for the diode.

 

[thesk8nmidget]

Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

Oh crap!

Well, the climbing power could be the cause of death.. I was expecting 160-170mW, not 191mW, which translates to ~245mW raw output (guesstimated). But the question is, why did the power climb? What driver did you use for this test? How sure are you of the stability of current?

Usually, when i saw PHRs climb in power, it was always temperature related. It doesn't have to get noticably warm or even hot for this to happen. The difference between 20 and 24°C could cause a 10mW climb on the weird diodes, that climb with temperature. If i let them run till they reached 25°C or if i put them in the pocket till they reached 25°C, the results were the same.

Several experts speculated, it could be a mirror alignment thing, because the actual efficiency of the diode can not climb with heat.


But 90 minutes is not very encouraging.  :-/

I sure hope not all of them climb with heat.

well im using a flexmod1 driver from drlava.

im not sure how efficient it is compared to other drivers but it is made for projectors which require a pretty efficient power for color mixing.

this was ran at a little over 9 volts and the analog modulation was ran with my 5 volt power supply. the voltage on these are very efficient.


maybe i will hook up one of my others at 180ma and see how long it lasts.

but for now i need to clean the house and clean my mess.

im realy looking forward to other peoples tests.


calling dave calling dave... did i read that you hooked one up and you were letting it sit?

or did i miss read? if so what current and whats the status?

 

[robjdixon]

Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

I just got all of the diodes out of their heatsinks, the blu was a little tricky but I got through it. What's left of the sled is a torn mess. ;D I sawed my way through everything so it looks like crap, but it doesn't really matter because it is g[highlight]oing to be burned[/highlight] anyway. There are a ton of nifty little optics in this thing, I lost one of the beefier ones because it flew across my garage at high speeds when I clipped it out of its heatsink looking thing. I wish I could scrape up enough cash for another one of these sleds. :

Are they the same material as the Phr-803ts then?

 

[thesk8nmidget]

Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

I was able to get my diode out pretty simply.  First I removed the strange glass lens thing in front the diode, then I clipped the small tabs behind the back of the diode, then I took the small brass fitting I typically use for removing a diode from Aixiz modules and it fit right in the front of the heatsink piece.  Then, I used the module's focus ring behind the diode and used a vise to press the whole assembly, pushing the diode out of the heatsink.  It requires VERY little movement, so don't press too far or you'll smash and possibly break the diode pins, unless you have a deeper part behind the diode.

All and all, though it sounds complicated, it was much simpler than trying to cut the heatsink apart and probably safer for the diode since those vibrations may not be good for the diode.

that does sound easy enough. i need to find something like your brass fitting

 

[rkcstr]

Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

I got mine from from Lowe's... 2 for $1    You just have to grind the inner diameter a little bigger and the outer diameter some as well.  Not too hard with a small round file or I use a Dremel with a small cylindrical grinding stone.

Here's a topic I started way long ago about it:
http://www.laserpointerforums.com/forums/YaBB.pl?num=1199774489/0#0

 

[styropyro]

Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

[quote author=styropyro link=1223438970/580#598 date=1225568083]I just got all of the diodes out of their heatsinks, the blu was a little tricky but I got through it. What's left of the sled is a torn mess. ;D I sawed my way through everything so it looks like crap, but it doesn't really matter because it is g[highlight]oing to be burned[/highlight] anyway. There are a ton of nifty little optics in this thing, I lost one of the beefier ones because it flew across my garage at high speeds when I clipped it out of its heatsink looking thing. I wish I could scrape up enough cash for another one of these sleds. :

Are they the same material as the Phr-803ts then?[/quote]
I thought they were, I just tried to light one and it just melted down really easily without burning up. By the way it looked while it was molten I'm going to guess it is zinc. Now I have a little 6x sled ingot. ;D

 

[IgorT]

Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

I mean, the reason constant current is normaly a very safe way of powering diodes is preciselly because their power drops, as they heat up. Provided, the heatsinking is good, the diode won't overheat, but it will warm up slightly, the power will drop a little bit, and the stress on the die will be lower - it protects itself..

If you cool it to a lower temperature, than when you set the current, the power will be higher, and the stress will increase.


But if the power climbs with heat, the diode is more and more stressed, the longer it is on, and it can result in COD. A diode like this could actually be saved by a duty cycle. But since only a small temperature change is required to increase the power so much, simply carrying it in your pocket and then using it could bring it to a power level, that would kill it..

When i saw a PHR shoot up from 155mW to 178mW, i turned it off immediatelly, so that it would not commit COD. Strangelly enough that PHR later stabilised at 164mW and still lives.. But such climbing is really not safe.

A diode that climbs in heat would require a constant power driver, which would lower the current appropriatelly. But we don't have such drivers, and these diodes don't have a photo diode inside anyway....


With PHRs it was rare, so i really hope it's equally rare with these. But we alreay have two reports...

 

[rkcstr]

Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

I did notice that the power output tended to creep up with time when I was doing my measurements.  I tried to measure until it was somewhat stable at a value, but in the short runs I tested (like <60s), it didn't really seem to stabilize at the higher currents, but the rate of increase would slow.  Also, as I noted for my measurements, the voltage tended to do the same thing in the opposite direction.  At the high values like 200mA, the voltage was around 6V, but it would start at like >6.1V, then quickly drop (in about 2 seconds) to close to 6V, then it would continue to slowly drop over time, and I saw it continue as low as about 5.8V.  From just short term runs, around a minute or so, I could see around a 0.2 to 0.3V drop with time, but I just reported the initial "close to stable" voltage since I wasn't sure it was just due to temperature since it was only in an Aixiz module.

 

[IgorT]

Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

maybe i will hook up one of my others at 180ma and see how long it lasts.

Yeah.. But you should be aiming at a power, more than a current. They can survive a certain max power, not a max current.

So if you set it to a certain current, and the power is higher, than expected, it should be lowered.
And if you see the power climb above the desired power, turn it off and lower the current, try to find one, where the power doesn't climb (if it exists).

I wasn't expecting these to survive 191mW after AixiZ acrylics. I would like 160-170mW, and i'll be happy. That would bring these close enough to 200mW with glass optics.



One other case, where the power can change drastically with small changes in temperature, is when the diode is inside a kink. Sometimes they start mode hopping in kinks (did you see any spot distortion?)..

It would definitelly be very useful, to make a detailed graph of each, before deciding on the current to set it to.