Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers

LPF Donation via Stripe | LPF Donation - Other Methods

Links below open in new window

ArcticMyst Security by Avery

First Attempt (fail)

Eudaimonium

Eudaimonium

0
Joined
Feb 5, 2008
Messages
6,252
Points
83
blackspirit said:
Possible murder

Just a long shot, but worth the try.

Ditch the DMM, get fresh batteries, have the battery and LD directly to the driver. (solder), and give it about 7v
Its also hard to tell from the photo, but is the LD + - bridged?

and resize the photos, lol
Click to expand...
That's a really bad advice to give, dude!

DMM is not exactly cheapo that you can just buy a new one, if you haven't noticed autoranging functions and stuff.

We already confirmed that LD is dead, no need to cause more damage.
 





blackspirit

blackspirit

0
Joined
Aug 30, 2008
Messages
260
Points
18
Eudaimonium said:
That's a really bad advice to give, dude!

DMM is not exactly cheapo that you can just buy a new one, if you haven't noticed autoranging functions and stuff.

We already confirmed that LD is dead, no need to cause more damage.
Click to expand...

I know, hence the "long shot"


Did I say the DMM was crap?

My bad, could of worded it better, but I was saying ditch the DMM, meaning, get it out of the circuit
 
Eudaimonium

Eudaimonium

0
Joined
Feb 5, 2008
Messages
6,252
Points
83
blackspirit said:
I know, hence the "long shot"


Did I say the DMM was crap?

My bad, could of worded it better, but I was saying ditch the DMM, meaning, get it out of the circuit
Click to expand...
Oh that, haha :crackup:
Many sorrys, I understood you as "throw it in the trash can" , my bad! :beer:
 
zerocover

zerocover

0
Joined
Jul 6, 2010
Messages
20
Points
0
Second attempt, exactly the same as the first.

I done, I give up on lasers. Right now I'm banking on it being the driver, but do I really want to start all over from scratch. Hell I'm not even going to buy a prebuilt one, this must be a sign to not mess with such things.

This is a new diode and it was the exact same result, another LED.

Could this be because I'm powering everything off that 9v there?
 

Attachments

  • ABCD0006.JPG
    ABCD0006.JPG
    222.3 KB · Views: 118
  • ABCD0007.JPG
    ABCD0007.JPG
    203.3 KB · Views: 117
zerocover

zerocover

0
Joined
Jul 6, 2010
Messages
20
Points
0
Furthermore can someone explain to me how a laser diodes actually "burns" out.
This diode still looks just fine @20 and 400x.
 

Attachments

  • 10071221472950133432.jpg
    10071221472950133432.jpg
    300.8 KB · Views: 127
  • 10071221470850111982.jpg
    10071221470850111982.jpg
    236.4 KB · Views: 119
  • 10071221462750071219.jpg
    10071221462750071219.jpg
    222.9 KB · Views: 112
  • 10071221455550039676.jpg
    10071221455550039676.jpg
    208.6 KB · Views: 130
  • 10071221453750021221.jpg
    10071221453750021221.jpg
    243.2 KB · Views: 105
  • 10071221443749961285.jpg
    10071221443749961285.jpg
    88.3 KB · Views: 114
  • 10071221435349917043.jpg
    10071221435349917043.jpg
    65.6 KB · Views: 103
chipdouglas

chipdouglas

0
Joined
Dec 23, 2008
Messages
3,948
Points
63
before you give up try with a fresh brand new 9v batt. 9v are frowned upon in this hobby because they don't carry enough current unless they are new

also, i can't explain the how, but i do know that a diode can die with out the interal wires breaking. when it happens where the interal wires don't break, some ppl use those diodes instead of test loads.

michael
 
Last edited:
zerocover

zerocover

0
Joined
Jul 6, 2010
Messages
20
Points
0
I tried it with the 5v lead from a power supply. 12A capable.

Next time around I'll be using a current regulated power supply (actual plug in power supply), and eliminating all possible problems one at a time.
 
Ramsey_innovations

Ramsey_innovations

0
Joined
May 10, 2009
Messages
379
Points
28
chipdouglas said:
also, i can't explain the how, but i do know that a diode can die with out the interal wires breaking. when it happens where the interal wires don't break, some ppl use those diodes instead of test loads.

michael
Click to expand...

It's known as COD or catastrophic optical damage. The end facets of the laser dye basically burn up. It is responsible for the majority of laser diode deaths.
 
Last edited:
Ramsey_innovations

Ramsey_innovations

0
Joined
May 10, 2009
Messages
379
Points
28
zerocover said:
I tried it with the 5v lead from a power supply. 12A capable.

Next time around I'll be using a current regulated power supply (actual plug in power supply), and eliminating all possible problems one at a time.
Click to expand...

A 5v supply would not work. If you read the pdf for the driver you must have a minimum of 2.25v + the diode v drop (in this case around 3v) and its a good idea to leave about 2.5v minimum head room for proper regulation. So your looking at a min 7.75v, plus you need the current to back it up which most 9v batts cannot provide. You may try two 9v batts in parallel just to test.

BTW sorry about the double post
 
Last edited:
pocketfluff

pocketfluff

0
Joined
Oct 25, 2007
Messages
221
Points
0
Hook the diode up directly to a couple of weakened ni mh rechargeables to test.

But it looks like the alligator clips are to blame. Did you at least see a very bright and fleeting flash of the laser at full power before it went dim?
 
Eudaimonium

Eudaimonium

0
Joined
Feb 5, 2008
Messages
6,252
Points
83
pocketfluff said:
Hook the diode up directly to a couple of weakened ni mh rechargeables to test.

But it looks like the alligator clips are to blame. Did you at least see a very bright and fleeting flash of the laser at full power before it went dim?
Click to expand...
DON'T DO THAT!

Dude, WTF?

Hooking it up directly to a battery can only tell that it's now an LED. You can get the same testing results from hooking it up to wall outlet.

As I've said, permanent solder connection between diode and a driver is needed, because driver has a capacitor on the output, paralel to the diode.
 
zerocover

zerocover

0
Joined
Jul 6, 2010
Messages
20
Points
0
pocketfluff said:
Hook the diode up directly to a couple of weakened ni mh rechargeables to test.

But it looks like the alligator clips are to blame. Did you at least see a very bright and fleeting flash of the laser at full power before it went dim?
Click to expand...

No bright flash either time. I know its the driver.
 
You must log in or register to reply here.




Top