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

Weird 445 output!

awillis2589

awillis2589

0
Joined
Jun 21, 2012
Messages
2,019
Points
48
Ok so I just built this 445nm m-140 I got from Dtr and I've got quite a few diodes from him in the past but have never had a problem before. The output is very weird and I've tried blowing air into it to clean it as well as use a cleaning stick the I use on DSLR but to no avail. And ideals?

2012-11-11_23-44-10_666.jpg
 





DrSid

DrSid

0
Joined
Jul 17, 2010
Messages
1,506
Points
48
Window dirt looks a bit different .. you get interference all over the spot .. but yours is only in the middle .. looks like dirt on chip itself .. just my two cents ..
 
S

sarbanes

0
Joined
May 16, 2008
Messages
87
Points
0
I had the same problem with a 638nm 400mW. The heat generated on the window is enough to mineralise a small contaminant there, and bake it on. You need to use dental tools under a magnifying glass, or a q-tip w/ isopropanol.

The high output makes this a possibility. Also, ask DTR, he is very helpful.
 
Last edited:
DTR

DTR

0
Joined
Jun 24, 2010
Messages
5,684
Points
113
Yep looks like something got baked on the diode window.:(
 
awillis2589

awillis2589

0
Joined
Jun 21, 2012
Messages
2,019
Points
48
i have no idea how this could have happened? is there anyway to fix this? maybe de-can it or something. i really don't want to spend another $50 for another diode, on top of the fact i need to buy a tool to press the diode out, as i only have the tool to press the diode in.

Edit: under magnification there isn't anything baked into the lens there it actually a pit in the center of the lens. which is making the weird output.
 
Last edited:
DTR

DTR

0
Joined
Jun 24, 2010
Messages
5,684
Points
113
I use a Q-tip and some rubbing alcohol before thinking about radical decanning. Just be careful not to use too much force or you could damage the diode window.

As for the pit you see there is an artifact on every 445 diode window dead center where the light passes through and which may be what you are seeing.
 
awillis2589

awillis2589

0
Joined
Jun 21, 2012
Messages
2,019
Points
48
Did the q-tip and rubbing alcohol before coming to work and still the same. Is there any quick fixes as this laser was suppose to sold like last week? I had multiple set backs from not getting the glass lens to the wrong host body.

Thanks
Andrew

Edit: when I get out of work I can try and get a macro of the diode, and a better shot of the output.
 
Last edited:
Blord

Blord

0
Joined
Dec 24, 2007
Messages
5,356
Points
0
If you can't take out the diode then get the glass window out on the ugly way. Take a fine tipped long nose plier and bent the metal up around the glass windows. Eventually the piece of glass will fall out. It is ugly but it works.

swanstrom-s325-long-nose-serrated-plier-1.jpg
 
awillis2589

awillis2589

0
Joined
Jun 21, 2012
Messages
2,019
Points
48
What do you do with the parts when you get the glass out? Do you push them back in? Or cut them off?

What affect on the beam does it make?
 
Blord

Blord

0
Joined
Dec 24, 2007
Messages
5,356
Points
0
awillis2589 said:
What do you do with the parts when you get the glass out? Do you push them back in? Or cut them off?

What affect on the beam does it make?
Click to expand...

The beam should look cleaner unless the dirt is on the die.
I would bent the metal edge back. It has no effect on the beam.
The 445nm diode will run just fine without a glass windows. It is now more expose to the air.
 
awillis2589

awillis2589

0
Joined
Jun 21, 2012
Messages
2,019
Points
48
So there's a chance that their might be dirt under the glass window? Would that be like a bad diode. Haven't heard of many or any bad brand new diodes. (I would be my luck to get a junk one and be screwed)
 
awillis2589

awillis2589

0
Joined
Jun 21, 2012
Messages
2,019
Points
48
Well thank you so much blord for your tip, it worked like a charm. It's not pretty but works just like it should. Saved me $60 at least for a new diode and press tool. I'd rep you again but I've got to share some more rep around before I do that.
 
Blord

Blord

0
Joined
Dec 24, 2007
Messages
5,356
Points
0
You are welcome. Sometimes unconventional methods will work but I am very hesitating to put it on public. It is not really by the book. :)
 
awillis2589

awillis2589

0
Joined
Jun 21, 2012
Messages
2,019
Points
48
Blord said:
You are welcome. Sometimes unconventional methods will work but I am very hesitating to put it on public. It is not really by the book. :)
Click to expand...

yeah my only other option would be to buy a press. press it out and try decaning the top half where the glass was.:undecided:
 
Last edited:
DrSid

DrSid

0
Joined
Jul 17, 2010
Messages
1,506
Points
48
Would you mind posting a picture of diode with glass removed this way ?
 
Last edited:
You must log in or register to reply here.




Top