Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





Welcome to Laser Pointer Forums! If you are looking for a laser pointer or want to compare different laser pointer companies, you may want to check out the LPF Laser Pointer Company Database. The link will open in a new window for your convenience.








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers


One laser store meets all your needs

























Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Tutorials, Help & Repairs



LPF List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 01-21-2008, 07:34 AM #1
Junior Member
 
Join Date: Nov 2007
Posts: 27
Rep Power: 0
mrblack927 is on a distinguished road
mrblack927 mrblack927 is offline
Junior Member
 
Join Date: Nov 2007
Posts: 27
Rep Power: 0
mrblack927 is on a distinguished road
Default Diode damage on homemade blu-ray?

Hi all, I recently put together my first blu ray pointer using one of daedal's GB diodes. Soldered together a driver circuit, and gave it all a nice handheld home. But I have a question. As you can see from the picture, theres a faint yellow glow around the dot. Has anyone else experienced this?

Could the laser diode be damaged somehow? Like from too much power to run it but not enough to burn it out? I was very careful to use only just enough power to get the diode to start lasing but I fear I screwed it up anyway.

Thanks everyone
Attached Thumbnails
Diode damage on homemade blu-ray?-100_0803.jpg  


mrblack927 is offline   Reply With Quote







LPF List of Laser Pointer Companies (link opens new window)







Old 01-21-2008, 09:30 AM #2
Class 3R Laser
 
Join Date: Aug 2007
Posts: 1,880
Rep Power: 21
BlueFusion is just really niceBlueFusion is just really niceBlueFusion is just really niceBlueFusion is just really nice
Send a message via MSN to BlueFusion
BlueFusion BlueFusion is offline
Class 3R Laser
 
Join Date: Aug 2007
Posts: 1,880
Rep Power: 21
BlueFusion is just really niceBlueFusion is just really niceBlueFusion is just really niceBlueFusion is just really nice
Send a message via MSN to BlueFusion
Default Re: Diode damage on homemade blu-ray?

Doesn't appear to be a diode problem. If anything, your lens might be fluorescing.
BlueFusion is offline   Reply With Quote
Old 01-21-2008, 10:11 AM #3
rog8811's Avatar
Class 3B Laser
 
Join Date: Jul 2007
Location: Berkshire UK
Posts: 2,749
Rep Power: 193
rog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond repute
rog8811 rog8811 is offline
Class 3B Laser
rog8811's Avatar
 
Join Date: Jul 2007
Location: Berkshire UK
Posts: 2,749
Rep Power: 193
rog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond repute
Default Re: Diode damage on homemade blu-ray?

Quote:
theres a faint yellow glow around the dot. Has anyone else experienced this?
I saw that when I first powered up my blue-ray, I know mine was underpowered for the circuit I was using. When I put rechargables in there was enough overhead voltage for the regulator to work properly and the yellow went away.

What voltage are you using into the LM317? For a blue-ray you need an absolute minimum of 7.5v, 9v has been found to be best.

Regards rog8811
__________________
See all of my videos on Vimeo
http://www.vimeo.com/4454150

Lots of tutorials and information on lasers
http://www.rog8811.com/

In the land of the blind the one eyed man..... is most likely holding the laser
rog8811 is offline   Reply With Quote
Old 01-21-2008, 03:54 PM #4
Junior Member
 
Join Date: Nov 2007
Posts: 27
Rep Power: 0
mrblack927 is on a distinguished road
mrblack927 mrblack927 is offline
Junior Member
 
Join Date: Nov 2007
Posts: 27
Rep Power: 0
mrblack927 is on a distinguished road
Default Re: Diode damage on homemade blu-ray?

I'm using a brand new 9v so I know that's not a problem. I'm using daedal's circuit and I kept the trimmer pretty low because I'm afraid to turn it too high.

Maybe I'm being too cautious... I'm at about 45ohms of resistance right now(it started lasing a little bit above that), do you think its safe to go any lower?
mrblack927 is offline   Reply With Quote
Old 01-21-2008, 04:40 PM #5
rog8811's Avatar
Class 3B Laser
 
Join Date: Jul 2007
Location: Berkshire UK
Posts: 2,749
Rep Power: 193
rog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond repute
rog8811 rog8811 is offline
Class 3B Laser
rog8811's Avatar
 
Join Date: Jul 2007
Location: Berkshire UK
Posts: 2,749
Rep Power: 193
rog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond repute
Default Re: Diode damage on homemade blu-ray?

I couldn't get a good photo of my odd beam so I drew it, does yours look anything like the pici below?

Have you put a 1ohm resistor in series with the LD to see how many ma you are feeding it? (by measuring the voltage drop across the resistor in mv) The consensus around here is find lase point then go another 10ma.

If you do this make sure you short out the capacitor before connecting or disconnecting the LD.

Regards rog8811
Attached Thumbnails
Diode damage on homemade blu-ray?-under-driven_beam01.jpg  
__________________
See all of my videos on Vimeo
http://www.vimeo.com/4454150

Lots of tutorials and information on lasers
http://www.rog8811.com/

In the land of the blind the one eyed man..... is most likely holding the laser
rog8811 is offline   Reply With Quote
Old 01-21-2008, 04:54 PM #6
Class 3R Laser
 
Join Date: Oct 2006
Posts: 2,032
Rep Power: 31
pseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud of
pseudonomen137 pseudonomen137 is offline
Class 3R Laser
 
Join Date: Oct 2006
Posts: 2,032
Rep Power: 31
pseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud of
Default Re: Diode damage on homemade blu-ray?

Quote:
Originally Posted by mrblack927
I'm using a brand new 9v so I know that's not a problem. I'm using daedal's circuit and I kept the trimmer pretty low because I'm afraid to turn it too high.

Maybe I'm being too cautious... I'm at about 45ohms of resistance right now(it started lasing a little bit above that), do you think its safe to go any lower?
45 ohms is only gunna let ~28mA - pretty low for a blu-ray diode. Perhaps lower it to 32-35ohms
pseudonomen137 is offline   Reply With Quote
Old 01-21-2008, 09:14 PM #7
Gazoo's Avatar
Class 3B Laser
 
Join Date: Jun 2007
Location: Dallas Tx
Posts: 3,199
Rep Power: 180
Gazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond repute
Gazoo Gazoo is offline
Class 3B Laser
Gazoo's Avatar
 
Join Date: Jun 2007
Location: Dallas Tx
Posts: 3,199
Rep Power: 180
Gazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond repute
Default Re: Diode damage on homemade blu-ray?

He..he...I was just going to say that. I have been recommending 33 ohms which will supply 38ma's to the diode. I am using a multi-turn precision pot and have mine set to supply 38ma's. Radio Shack has 33 ohm resistors.
Gazoo is offline   Reply With Quote
Old 01-21-2008, 09:40 PM #8
Class 2 Laser
 
Join Date: Nov 2007
Posts: 270
Rep Power: 11
member02 is on a distinguished road
member02 member02 is offline
Class 2 Laser
 
Join Date: Nov 2007
Posts: 270
Rep Power: 11
member02 is on a distinguished road
Default Re: Diode damage on homemade blu-ray?

more current is needed. lower the ohms of the resistor.
member02 is offline   Reply With Quote
Old 01-21-2008, 09:53 PM #9
Class 2M Laser
 
Join Date: Jun 2007
Posts: 650
Rep Power: 16
chimo is a jewel in the roughchimo is a jewel in the roughchimo is a jewel in the roughchimo is a jewel in the rough
chimo chimo is offline
Class 2M Laser
 
Join Date: Jun 2007
Posts: 650
Rep Power: 16
chimo is a jewel in the roughchimo is a jewel in the roughchimo is a jewel in the roughchimo is a jewel in the rough
Default Re: Diode damage on homemade blu-ray?

Both of my Blurays have the artifacts you describe.
chimo is offline   Reply With Quote
Old 01-21-2008, 10:18 PM #10
Junior Member
 
Join Date: Nov 2007
Posts: 27
Rep Power: 0
mrblack927 is on a distinguished road
mrblack927 mrblack927 is offline
Junior Member
 
Join Date: Nov 2007
Posts: 27
Rep Power: 0
mrblack927 is on a distinguished road
Default Re: Diode damage on homemade blu-ray?

Thanks everyone, I lowered the resistance it seems to work fine. I don't know if the 'artifacts' necessarily disappear, but they are now overshadowed by the actual laser dot, which is fine too.

appreciate the help!
mrblack927 is offline   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On











Loading








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 02:02 AM.


Powered by: vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC