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 > Experiments & Modifications



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



Reply
 
LinkBack Thread Tools Display Modes
Old 11-09-2007, 10:47 AM #1
Class 2 Laser
 
Join Date: Nov 2007
Posts: 342
Rep Power: 12
woop will become famous soon enoughwoop will become famous soon enough
woop woop is offline
Class 2 Laser
 
Join Date: Nov 2007
Posts: 342
Rep Power: 12
woop will become famous soon enoughwoop will become famous soon enough
Default Laser driver with feedback

Hi all.
i have been looking around this site a bit, and it seems most people are using constant current sources or bought drivers.
anyone successfully made a driver with optical feedback?
I was looking at some of the drivers on sams laser FAQ and it seems the diodes i encountered from dvd drives are not compatible with most of the circuits. would the "SG-LD2" be suitable for driving DVD burner lasers?
from memory, the last diodes i killed where common cathode i think (is that usual for dvd drives?)
schematic: repairfaq.ece.drexel.edu/sam/sgld2sch.gif


woop is offline   Reply With Quote







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







Old 11-09-2007, 12:18 PM #2
Class 2 Laser
 
Join Date: Nov 2007
Posts: 342
Rep Power: 12
woop will become famous soon enoughwoop will become famous soon enough
woop woop is offline
Class 2 Laser
 
Join Date: Nov 2007
Posts: 342
Rep Power: 12
woop will become famous soon enoughwoop will become famous soon enough
Default Re: Laser driver with feedback

ok so i have decided to experiment a bit.
i cut down that schematic in the last post to the bare minimum for running off a battery
and i have made some pcb's to test it out.
if anyone knows anything about drivers of this kind please give me some hints.

also does anyone know specs for input current, output power and voltage for DVD lasers (16x or 18x recorders)
woop is offline   Reply With Quote
Old 11-09-2007, 03:24 PM #3
Class 2M Laser
 
Join Date: Aug 2007
Posts: 790
Rep Power: 23
a_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to behold
a_pyro_is a_pyro_is is offline
Class 2M Laser
 
Join Date: Aug 2007
Posts: 790
Rep Power: 23
a_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to behold
Default Re: Laser driver with feedback

Woop, welcome to the forum.
Please understand that while no one here will be upset with you for asking a question, the info you're asking for is already on the forum. The search button is your friend (make sure to look further back than 1 week)

Most of the DVD reds are built without an internal photodiode, so I don't think you can easily make that circuit work. But there is a much easier way to drive a laser diode. Just use a very common constant-current source.
a_pyro_is is offline   Reply With Quote
Old 11-09-2007, 03:47 PM #4
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: Laser driver with feedback

I seem to recal that a lot of the LD's that have been used, though they have a sense diode pin, there is no connection inside the can...I realise this is not always the case but worth checking...and welcome to the forum.

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 11-09-2007, 10:40 PM #5
Class 2 Laser
 
Join Date: Nov 2007
Posts: 342
Rep Power: 12
woop will become famous soon enoughwoop will become famous soon enough
woop woop is offline
Class 2 Laser
 
Join Date: Nov 2007
Posts: 342
Rep Power: 12
woop will become famous soon enoughwoop will become famous soon enough
Default Re: Laser driver with feedback

that "This post was made in the last..." feature is really annoying :-[
still even further back from a week, no one seems to be using home made feedback circuits.

Quote:
I seem to recall that a lot of the LD's that have been used, though they have a sense diode pin, there is no connection inside the can...I realize this is not always the case but worth checking...and welcome to the forum.
really?? in my (limited) experience, dvd writers do tend to have a 3rd pin which is connected to a photo diode. although i have only looked at one writer and a few readers.
if this is the case i wonder why. maybe they have some other form of feedback for the laser power level, because you would think that this would be necessary to write dvd's.

i was thinking that using a feedback circuit would be the way to go, i mean all the consumer applications use a feedback loop and it seems like a far superior way of driving a LD than simple current limiting. especially if the current is adjusted while the LD is turned on, due to warm up and the risk of blowing the LD on next use without optical feedback.
anyway, i have made the boards for this driver so i might as well use them.

to get decent power out of a LD. should i set it to a particular current and hope it works or connect a meter to the photo diode and increase current until the light output stops increasing?

and with the dvd writer specifications. there seems to be a lot of conflicting advice on these forums.
what is the best general current for a 18x dvd writer diode?

and one last thing. these open can diodes. would they fit in an Axiz laser housing and do they have feedback? specifically the ones from pioneer 112D drives

thanks
woop is offline   Reply With Quote
Old 11-10-2007, 12:33 AM #6
Class 2M Laser
 
Join Date: Aug 2007
Posts: 790
Rep Power: 23
a_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to behold
a_pyro_is a_pyro_is is offline
Class 2M Laser
 
Join Date: Aug 2007
Posts: 790
Rep Power: 23
a_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to behold
Default Re: Laser driver with feedback

I can't speak about the 112D diode as I haven't seen one. The open can diode I do have has three pins, but there is no PD connected to the third.

Yes, you must have some sort of means to measure the optical output in order to write to a disk, but in almost all I've seen, there are either one or two discrete photo diodes.
a_pyro_is is offline   Reply With Quote
Old 11-10-2007, 01:05 AM #7
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: Laser driver with feedback

woop, welcome to the forum. I have used about 200mA for a drive current for the 16x group buy LDs, although that is overdriving it somewhat. Good luck on your mods!

Paul

Quote:
Originally Posted by woop
that "This post was made in the last..." feature is really annoying *:-[
still even further back from a week, no one seems to be using home made feedback circuits.

Quote:
I seem to recall that a lot of the LD's that have been used, though they have a sense diode pin, there is no connection inside the can...I realize this is not always the case but worth checking...and welcome to the forum.
really?? in my (limited) experience, dvd writers do tend to have a 3rd pin which is connected to a photo diode. although i have only looked at one writer and a few readers.
if this is the case i wonder why. maybe they have some other form of feedback for the laser power level, because you would think that this would be necessary to write dvd's.

i was thinking that using a feedback circuit would be the way to go, i mean all the consumer applications use a feedback loop and it seems like a far superior way of driving a LD than simple current limiting. especially if the current is adjusted while the LD is turned on, due to warm up and the risk of blowing the LD on next use without optical feedback.
anyway, i have made the boards for this driver so i might as well use them.

to get decent power out of a LD. should i set it to a particular current and hope it works or connect a meter to the photo diode and increase current until the light output stops increasing?

and with the dvd writer specifications. there seems to be a lot of conflicting advice on these forums.
what is the best general current for a 18x dvd writer diode?

and one last thing. these open can diodes. would they fit in an Axiz laser housing and do they have feedback? specifically the ones from pioneer 112D drives

thanks
chimo is offline   Reply With Quote
Old 11-10-2007, 01:36 AM #8
Class 1M Laser
 
Join Date: Aug 2007
Posts: 241
Rep Power: 11
Zarniwoop is on a distinguished road
Zarniwoop Zarniwoop is offline
Class 1M Laser
 
Join Date: Aug 2007
Posts: 241
Rep Power: 11
Zarniwoop is on a distinguished road
Default Re: Laser driver with feedback

The open-can LD from that drive does fit in an Aixiz module - that's what I'm using now. But it is harder than most to get it out of its heatsink intact.

Now that I look closely inside, I can see that the extra pin indeed has no connection.
I assume in the actual drive they do the power moitoring externally.

There's something to be said for the simplicity and parts-availability of an LM317-type circuit, but if you get a feedback circuit working, I'm sure a bunch of us would be interested in seeing it.

Look at the Threads of Interest at the top of the Experiments and Modifications section.
In there you can find measured current vs. output power curves for various diodes including open-can types.
Zarniwoop is offline   Reply With Quote
Old 11-10-2007, 01:48 AM #9
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: Laser driver with feedback

Speaking of open can diodes, I finally got the guts to run mine up to 600ma's of current...this measured 308mw's on my LPM-1.. ;D This diode came out of a 112D and I can tell you I know it is very durable electrically. I ran it for about 5 minutes with a TEC, but the cube my diode is in started to get warm and the output dropped to 285mw's. I could add a fan to the heatsink of the TEC and I am sure that the cube would then stay cool. I really need to redo the whole thing anyway. :P

Attached Thumbnails
Laser driver with feedback-tec.jpg  
Gazoo is offline   Reply With Quote
Old 11-10-2007, 01:58 AM #10
Class 1M Laser
 
Join Date: Aug 2007
Posts: 241
Rep Power: 11
Zarniwoop is on a distinguished road
Zarniwoop Zarniwoop is offline
Class 1M Laser
 
Join Date: Aug 2007
Posts: 241
Rep Power: 11
Zarniwoop is on a distinguished road
Default Re: Laser driver with feedback

Has anybody found a datasheet, or even the model number for these diodes?
Zarniwoop is offline   Reply With Quote
Old 11-10-2007, 02:00 AM #11
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: Laser driver with feedback

Nope...not even a picture from a manufacturer.
Gazoo is offline   Reply With Quote
Old 11-10-2007, 02:19 AM #12
MarioMaster's Avatar
Class 3B Laser
 
Join Date: Jul 2007
Location: Allentown, PA
Posts: 3,621
Rep Power: 346
MarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond repute
Send a message via AIM to MarioMaster
MarioMaster MarioMaster is offline
Class 3B Laser
MarioMaster's Avatar
 
Join Date: Jul 2007
Location: Allentown, PA
Posts: 3,621
Rep Power: 346
MarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond repute
Send a message via AIM to MarioMaster
Default Re: Laser driver with feedback

yea gazoo those are very low powered tecs, i think you could have some fun with a larger one that could keep the diode at a lower temperature even when running at 600ma

i would really like to buy some as i only have the high powered kind and can't be run off of the psu inside my lab laser i made without the transformer overheating
__________________
ILT 5500KR krypton only air cooled ion 100mW 647.1nm | ILT 5500AR argon only air cooled ion >300mW multiline
Omnichrome 643 air cooled Ar/Kr ion 10mW 676.4nm 647.1nm 568.2nm 488nm 476.2nm (high hours)
Spectra Physics 127 >30mW 632.8nm HeNe | Uniphase 1.5mW 543.5nm GreeNe
Coherent Innova 90 argon ion water cooled ??W (got plasma, alignment in progress)
Coherent 60W 830nm water cooled diode brick | Shenhui Laser 40W 10600nm water cooled CO2

(9:03:50 PM) Picasso: the best guys i saw ever at burning man was two dudes dressed as all green army men shooting pants at naked guys
MarioMaster is offline   Reply With Quote
Old 11-10-2007, 02:44 AM #13
Class 2 Laser
 
Join Date: Nov 2007
Posts: 342
Rep Power: 12
woop will become famous soon enoughwoop will become famous soon enough
woop woop is offline
Class 2 Laser
 
Join Date: Nov 2007
Posts: 342
Rep Power: 12
woop will become famous soon enoughwoop will become famous soon enough
Default Re: Laser driver with feedback

thanks for the replies. I will use a current limiting circuit first and if i can be bothered rigging up an external photodiode i will try the feedback type driver.

so is a TEC just a pelter cooled laser?
i read that someone was running a 112D laser with 400mA and getting good results without a TEC. i wonder how much current one could take with just the Axiz case as a sink.
I also read that the 112D lasers where some of the easiest to extract? how are they attached? I am thinking of getting one from here:
http://www.centrecom.com.au/catalog/...=1&sort=3a
(I am in Australia)

**EDIT** Fixed link {SenKat}
woop is offline   Reply With Quote
Old 11-10-2007, 02:55 AM #14
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: Laser driver with feedback

I think you will find this thread interesting:

http://www.candlepowerforums.com/vb/...d.php?t=166188
Gazoo is offline   Reply With Quote
Old 11-10-2007, 03:23 AM #15
Class 2 Laser
 
Join Date: Nov 2007
Posts: 342
Rep Power: 12
woop will become famous soon enoughwoop will become famous soon enough
woop woop is offline
Class 2 Laser
 
Join Date: Nov 2007
Posts: 342
Rep Power: 12
woop will become famous soon enoughwoop will become famous soon enough
Default Re: Laser driver with feedback laser diode

WOW 400mW from the 112D laser!!!
it doesn't look as fragile as i thought, its not fully open, like the sides look like they would protect it a bit.
yeah i think i would be happy with 150-200mW
my aixiz case has a plastic lens though. i hope it doesn't melt or anything.

i think maybe i should attach a thermistor to the diode while i am testing it
woop is offline   Reply With Quote
Old 11-10-2007, 04:17 AM #16
SenKat
Guest
 
Posts: n/a
SenKat
Guest
 
Posts: n/a
Default Re: Laser driver with feedback

Moving this to experiments and mods, folks :-)
  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 06:51 PM.


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