Nice Jerry! Glad to see you got 'er up and running.. those are some sweet numbers.
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Nice Jerry! Glad to see you got 'er up and running.. those are some sweet numbers.
Hi Jerry,
Thanks very much for those figures :) Do you by any chance happen to have any corresponding temperature figures? I'm wondering how effective that heatsink is at higher mW outputs without a TEC and or fan.
I've had it run for about 15 minutes at over 800mW and the
heat sink only gets warm to the touch... I'm thinking of installing
a small CPU fan on it..
Jerry
At similar powers I found that a fan was required. The z-bolt heatsink accepts 40mm fans..
*scratches chin... I got to get me one of them things.Quote:
Originally Posted by ElektroFreak
You have a nice setup there. Have you tried using a TEC to keep the diode temp stable?Quote:
Originally Posted by RedlumX
I suspect you will get higher power single mode operation If you do so
Of course - otherwise meaningful measurements can't be made, the thing would mode hop faster than one could see any clear picture. But to stabilize it to within a few thousands of a degree for a longer term is pretty tough, as the power dissipation is much higher than for the red diodes, and probably I need to spice up my Tec drivers.Quote:
Originally Posted by LaserLover
At what temperature did you take the readings ?Quote:
Originally Posted by RedlumX
You mean for the movie? I guess that was around 16C. But in general the single mode zones depend strongly on the temperature and the particular diode as well, so one needs to make systematic current/temperature scans for each diode separately, to find its single mode spots.Quote:
Originally Posted by LaserLover
I just did a test on the A140 445nm LD I got from Dan...
I installed it into an Aixiz Module using the same 405 G-1 lens
I used to test the A130 in Post #51 of this Thread..
It is also mounted in a Z-Bolt clam shell heat sink..
Here are my results...
I tested in 100mW increments and stopped at 1500mW..
I used an Opto Power Corporation OPC-PS4005 Laser
Diode Driver and our Newport 1825C LPM with a Thermopile
Sensor as the last test.
It is to be noted that on both tests the resolution of the
current was limited to 10mA so the readings indicated could
be 1 to 9 mA more...
Starts lasing @ 3.77V -- 7mW
050mW ---- 260mA ---- 3.82V
100mW ---- 300mA ---- 3.87V
200mW ---- 370mA ---- 3.95V
300mW ---- 440mA ---- 4.02V
400mW ---- 510mA ---- 4.08V
500mW ---- 580mA ---- 4.13V
600mW ---- 650mA ---- 4.17V
700mW ---- 720mA ---- 4.21V
800mW ---- 790mA ---- 4.25V
900mW ---- 880mA ---- 4.28V
1000mW -- 960mA ---- 4.31V
1100mW -- 1050mA --- 4.34V
1200mW -- 1150mA --- 4.36V
1300mW -- 1260mA --- 4.39V
1400mW -- 1380mA --- 4.42V
1500mW -- 1570mA --- 4.45V
The readings are a bit different from my A130 test... but that could
also be due to perhaps the A130 was a low end binned LD or the
A140 was an extremely high end binned LD...
To really know if the A140 LD are better we need more tests by
other members... The tests I performed are not destructive... and can
be done by anyone that has an LPM and DMM...
These tests will not blow your 445nm Laser Diode if you keep the tests
under 1200mW and follow a few standard safety measures... IMO
Once I find more time and more 445nm LDs I'll do some more of these
tests to get a better Average Idea of what these LDs are..
Jerry
...............Quote:
Originally Posted by lasersbee
http://www.photonlexicon.com/forums/...chmentid=11918
Although its quite obvious that it is just a type, you might want to edit that.*retardoQuote:
Originally Posted by lasersbee
Just Did... Thanks..:cool:Quote:
Originally Posted by MisterWilling
Jerry
I have been experimenting with the 4 lasers I have built. The beam is hard to tame with plain optic solutions by my normal methods of thought...closed can hindrance . I wanted to FAC one....fear of dust would probably kill it in short order before I could get it aligned and sealed up. So the advent of the cylindrical lens was approached....needing beam compression from a reverse telescope. The lens data....not exactly right for this test as some of the beam spilled off the lenses...adding to losses. I had to work with what I had in hand. Lenses are uncoated purchased from Surplus Shed some time ago for 473 usage. I think the 40 mm fl may have actually been 42mm fl...does not matter now as this route has been abandoned by me..
1 12mm fl - yielding 2x12{tan40/2} 10.0691 diameter beam
2 40mm fl - yielding 2x40{tan12/2} 8.5022 beam diameter final output
Employing a plano convex/concave lens setup after this setup gave a beam diameter of around 4.7mm....totally usable and very good round shape at the spot and beam checkpoints. Divergence was near 2 mrads. The losses were horrid because I don't have 445nm or A/R broadband in the pieces used for this test. The total length of the test fixture was nearly 11" in length. Projector unfriendly to me.
So I feel like the implementation of the anamorphics are a keen idea at this point...not to mention the "adjustability" of the system as it is being constructed. They have worked great in other diode setups needing compression in one axis. The cylinder lens may be useful , but I wanted a simpler setup. Someone should be able to prove me wrong here as I didn't spend a lot of time in actually nailing everything down to a "T"......just quick and dirty testing. Experiments gave very nice spot service from a beam expander in reverse....but focal points were set for 50'....needing boat paddle mirrors to scan it though. More testing in Winlase and Glad to come soon.
Mike have you tried using the tilted biconvex lense technique?
I have my first 445 build done and it pretty impressive power
here are the numbers:
A140 diode
1.5 amps at diode
1.525 watts at 445nm
2.25amps at 18650 battery
4171 host
405-G-1 lens
Microflexdrive
I got my A140 diode today "thanks Dave" and put it together with a Microflexdrive in a 4171 host
and a 405-G-1 lens.
I set the drive to max 1.5 amps and fired it up! 1550mw to start then after about 30
seconds it settles down to 1350 and is fairly steady there.
It started to pulse shortly thereafter so I shot the drive with freon and it stopped as
I figured it would.
So I rigged up the large pill in the 4171 as a heat sink for the drive, I insulated the connections I thought could short and with a little silicone heat sink compound on the final output driver I strapped it flat to the brass on the pill, No more pulsing now.
30 second on time is all I have given it so far. It burns crazy hot and boils water at the focal point.
the battery is a 18650 and it draws 2.2amps from it.
Strange seeing a bar for a focal point!
Here are some beam shots with a 600mw 12x , it looks 3 or 4 times brighter than the 12x
I am next going to test it with two 18650s in parallel and see how the power acts then
Test completed with two 18650s and the power at 30 seconds is now 1450mw
a gain of only 100mw so the battery is working fairly well
OK edit: The alligator clip jumpers weren't enough to carry the load so now they are doubled up
it now starts at 1.7 watts and after 30 seconds is at 1.5 watts with fresh cells
these things need a lot of heat sink!
Looks like a beast... *vigil Please be careful. http://www.photonlexicon.com/forums/...ons/icon12.gif
Do you have a firearm kecked? If so, is someone "going to get ahold of your gun and blow someone's head off"? Would you, as a grown human being, just keep your gun out where anyone can grab it up and do whatever with it? If you were to be so careless, is the the guns fault if someone gets hurt? Nope.. it's yours. I doubt that nospin here, being a grownup no doubt, would be that careless and it's disrespectful, insulting and otherwise generally uncool of you to assume he would IMO.
That kind of BS is why so many people who come here to join in the discussion leave with a bad taste in their mouth. This isn't your own personal forum, and it's not your place to say what can and can't be discussed here. You're just another member like the rest of us.
I agree with elektrofreak here. It is an OPEN forum so anything could be here discussed.
But i personally there is more interest in your pointer at Laserpointerforum.
http://laserpointerforums.com/
I read also the story who invented the gunpowder and that her regret that he had invented it. When your kids or someone els grabs your pointer and blinds themselves then i bet your regret your whole live that you build it. So please desassemble it when your done playing with it.:rolleyes:
What is Stupid is your response...IMOQuote:
Originally Posted by kecked
It's funny that you mentioned nothing about the 1.5Watt 445nm Labby
I built mentioned in the posts above....
I am also member on LPF and posted it there as well and did not receive any
negative comments because it was not a pointer...
The fact remains that I and Nospin posted 445nm LD technical Data that seems
to have fallen to the wayside in Nospins case because it is not a Labby build..
Maybe in your case... You should open a forum named LaserLabbyForum.com
I was going to post the Pointer I built... but didn't want to deal with the
likes of Anti-Pointer members like you...:cool:
Jerry
Hey guise I discovered that a cheap water heater contains pipes that are the exact right shape to fit a twelve gauge shotgun cartridge. I can tear them down for $800 and make at least 24 saturday night specials.
Does anyone want to buy a completely unsafe firearm?
Knowing roughly what Kecked does for a living, I can see how the pointers would cause him problems. It is a significant job, he's in a very responsible position, and knows of what he speaks. Its one of those jobs that if you screw up, you get nightmares.
Steve
Attachment 18126Attachment 18126ROFLMA....:cool:Quote:
Originally Posted by heroic
Jerry
Sounds like you're jacking people on a piece of shit..Quote:
Originally Posted by heroic
But seriously, if I were to own your POS water-heater cannon I sure as shit wouldn't leave it out where my kid could get it. Would you?
Damn people.. are we all really so timid? Nothing has happened yet, and all I hear is "WAHHHHHHH OMG OMG OMG OMG!!!!! IT'S ALL OVER. WE'RE ALL SCREWED!!!! WE CAN'T EVEN LEAVE THE HOUSE!!! PEOPLE WILL BLIND US ALL WITH THEIR HUGE BLUE LAZORS!!!!!!!
OMG OMG!!!!
Are there really so many people here who are such huge babies? Do you guys wear body armor whenever you leave the house?
Sure the danger is undeniably real, but these things aren't even going to be owned by but a small fraction of people anyway.. Lasers still will have limited ownership appeal. There are still millions and millions of people out there who wouldn't even spend the $200 for one of these 445nm portables.. It's a geek thing for the most part.
Dangerously high-powered class 4 portables have been around for some time.. they didn't just pop up all of a sudden.. More importantly they are far from the most dangerous thing we might run into or use in our daily lives. The real danger to society in general is minimal.
I'm as big of a proponent of laser safety as the next guy, but this is all just sensationalism and hysterics.
The difference is, a few weeks ago a one watt pointer would have cost about a thousand dollars. That tended to keep them out of the hands of anyone but the most devoted pointer fans. Now they're $200, which is much closer to the "impulse buy" point for morons who want to blind people.
Having recently had a long email conversation on a work mailing list about this (I work for a non-laser-related company) it's quite clear to me that most of the people buying the Wicked pointers just wanted a new toy and had no idea how dangerous they are.
Is the world suddenly overrun with morons who deliberately want to cause others harm? Typically, violent criminals make up a tiny fraction of society in general. Violent criminals with lasers make up an even TINIER fraction.
Look, I'm not arguing the fact that things are different now that Wicked stupidly put out these devices costing peanuts, nor am I trying to downplay how dangerous these devices are. All class 4 lasers are highly dangerous. I just refuse to cry and whine about something that has yet to have become a real problem for society. It very much remains to be seen if it will EVER become a real problem. And futhermore, even if it does become a problem, what do you and I do about it? Absolutely nothing. We sit back and watch the scene unfold because that's all that can be done. Crying about a worst-case scenario that hasn't even happened yet and might never be as terrible as some people worry is just stupid and a waste of effort. If you're anything like me you don't need more stress in your life.
I'm not talking about violent criminals, or even people who want to intentionally harm people at all; I'm talking about careless morons, the chronically misled, and those without the sense they were born with. They are the ones who worry me. And they have us outnumbered.
Please can we keep safety and pointer concerns in the many other threads devoted to this debate? :D
I believe this thread is about data relating to the diode itself, i.e. performance, electrical, thermal, optical characteristics etc.
Exactly...Quote:
Originally Posted by taggalucci
that was the main reason I posted my 445nm data in this Thread....
I read the Thread title BEFORE posting it..:cool:
Jerry
You want something to worry about...a pointer? Let me ask you why are you not worried about this oil gushing out into the Gulf ?????? This has already damaged beyond what the idiots....IE the media robots........ will ever reveal as the truth. Its not a spill...I spill my coffee....this is a freaking open well. This Jan when the new taxes come in to inforcement... people....you better wake up and look at what is going on behind the media's headlines. Most of the time....the death and decay of most anything starts from within....I am more concerned about things that have a little more importance...
Rush L. said "We have never had a president that wants to see his nation fail...at everything...."
http://www.promodisc.com.br/NDB7352-E.pdf
I saw this posted in another thread.
I am almost certain this is NOT the diode Casio are using; they are pulsing them well above (2x) that absolute maximum If, and what's more, they are operating them considerably above the 30 deg C max operating temperature cited here.Quote:
Originally Posted by -bart-
Comparing the 9mm Nichia diode to the Casio diodes I have , the beam characteristics are identical.
I think Nichia greatly under exaggerate the power of their diodes, hence why everybody runs the 50mw 445nm diode at 150mw
They're probably the same resonator design; doesn't mean they have the same package bond, max temperature or thermal rejection capacity.Quote:
Originally Posted by dave
Following mpoulton's example, I deleted my off-topic rant. :o
Adam
I have previously noted that these lasers are quite heat sensitive. They are permanently damaged by only a few seconds' operation without a heatsink, or by several seconds of sustained soldering. Others have noted, however, that these are run at rather high temperature in the Casio projectors. Here's one bit of information that I haven't seen noted anywhere yet:
The Casio projectors have a 100C thermal switch on the laser heatsink. They do not appear to have any other form of temperature monitoring for the array. Thus, we can probably assume that operation with a case temperature up to 100C will not cause instant damage.
In the interest of trying to save this important thread, which was to be dedicated to technical info only, without questions, discussion, or off-topic conversation, I am deleting my prior off-topic post. Maybe we can salvage this?
There are 2 small 10k NTC resistors inside the diode array. If you remove the flexible circuit board from the diodes there are 2 pink pieces of foam inside the array which sit on on 2 0603 sized SMD parts, these are both thermistors.
I don't have a working projector anymore, but I would assume the 100C thermal switch is a 'last resort' emergency shutdown, and that the normal temperature monitoring is done by the thermistors. Does anyone have the ability to mount a thermocouple on the diode array and let the projector run until it goes into overheat shutdown?
On my quad, I notice a gradual drop in power, from 7.2 watts at 22 deg C, to 6.5 watts at a heatsink temperature of 48 deg C.
This drop does not appear to be permanent and the power comes right back as soon as I drop the mod, let it cool for a few seconds, and throttle back up.
Ha! Good call. I hadn't looked carefully enough at the contents of that flex board. The choice of a 100C switch probably still means that a brief 100C excursion is survivable though.Quote:
Originally Posted by krazer
I can run that test, but I'm a bit reluctant to risk 24 lasers to do it. I just stripped out the last of the arrays I have right now (an hour ago I had four...) but when I get my next order later this week, I may thermocouple one up and give it a shot.
Hi. What is a Z-Bolt clam shell heat sink?Quote:
Originally Posted by lasersbee
Thanks!
-Franken
And for people that don't have the ability to see into the past before said item was discontinued, its a heatsink that you can bolt onto a normal 12mm diode housing
http://img.photobucket.com/albums/v5...s/DSC_1881.jpg
from http://www.photonlexicon.com/forums/...hp/t-7305.html
Look at the pic in Post #51...Quote:
Originally Posted by FrankenPC
I just ordered 10 of these that arrived on Friday....Quote:
Originally Posted by krazer
I don't think they are discontinued...:confused:
Jerry
Definitely not discontinued.. they can be purchased here: http://www.z-bolt.com/order/Product236
The only reference to the 'z-bolt heatsink' in Doc's oh so amazingly useful response refers to http://www.z-bolt.com/order/Product240 which has been replaced with HS-1A linked above.
In any case, I am expecting a new A140 projector to arrive next week which will allow me to restart testing of when the thermal cutoff kicks in, and take a more detailed analysis of the diode current in various operating modes.
edit:
I spent some time with the microscope and have determined the stripe width on these diodes is ~20um. Shown below is a sem micrograph, and a few visible light pictures of the diode. I couldn't get the whole die in focus at once due to the shape of the housing, but it is symmetric front to back so just use your imagination.
Attachment 18497Attachment 18498Attachment 18499Attachment 18501Attachment 18500
I would like to add that these diodes are amazing, I accidentally turned one on with NO heatsinking, it was bright, dimmed quickly and let out a puff of smoke...
put it back in the heatsink and turned it back on, it was doing the exact same power as pre-smoking! :eek:
The Z-bolt heatsinks can be good for making quick laser modules
Attachment 18561Attachment 18562Attachment 18563Attachment 18564
With the fan on top of the heatsink they barely get warm when I run the diode at 700mW
Troy
where are you guys getting these z-bolt heatsinks?
Here: http://www.z-bolt.com/MODIIIbg-green-laser-module.html
Fourth item on the list - HS-1a, Green Laser Module Heat Sink - US$15.00
I have attached a zip with an 8x14 array of x-rays, which cover the entire motherboard/diode driver board (both of these boards are 4-layer boards, so the xray helps tracing down traces).
If anyone is bored and feels like stitching them together to form a proper image be my guest!
cool thanks!!!!!!!Quote:
Originally Posted by loopee