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 04-02-2015, 07:26 AM #1
Junior Member
 
Join Date: Apr 2015
Posts: 6
Rep Power: 0
tobivan is on a distinguished road
tobivan tobivan is offline
Junior Member
 
Join Date: Apr 2015
Posts: 6
Rep Power: 0
tobivan is on a distinguished road
Default DIY Laser won't burn anything

Hello,
I have built a DIY Laser engraver according to this tutorial:
fun of DIY: A Raspberry Pi controlled mini CNC Laser engraver [last update Jan 18,2014]

I bought this laserdiode:
Sony RLD65PZB5 658nm Laserdiode 80mw/240mw - Insaneware Deluxe

According to the specs it can supply ~120 mW CW at a voltage of 2.5 V.

I am using the LM317 according to the tutorial mentioned above and I can measure 2.0-2.7 Volt and a current of between 100 and 190 mA. So I assume the circuit is working fine.

The laserdiode is in an Aixiz-housing, produces a nice red dot and is getting warm after a minute or so. BUT it looks like a very weak laserpointer-dot and it doesn't burn anything, no matter how far/near or focussed, black or white surfaces and so on. It seems to me as if the laserdiode produces heat and no "optical power". A second diode, identical, has the same results.

Thank you very much for helping me.



Last edited by tobivan; 04-02-2015 at 09:37 AM.
tobivan is offline   Reply With Quote







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







Old 04-02-2015, 09:35 AM #2
Aleksa's Avatar
Class 1M Laser
 
Join Date: Jan 2014
Location: Serbia,Nis
Posts: 118
Rep Power: 35
Aleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond repute
Send a message via Skype™ to Aleksa
Aleksa Aleksa is offline
Class 1M Laser
Aleksa's Avatar
 
Join Date: Jan 2014
Location: Serbia,Nis
Posts: 118
Rep Power: 35
Aleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond repute
Send a message via Skype™ to Aleksa
Default Re: DIY Laser won't burn anything

The diode is dead. Give us a picture to confirm. Diodes are very sensitive.
And what schematic did you use ? Better build a constant current regulator with a mosfet and an op amp then the crappy lm317.

Edit: I see the schematic now. It's unstable and just not a good idea. Use this :

http://rommet.com/remco/misc/Don's%2...on/glpdrv3.gif

Last edited by Aleksa; 04-02-2015 at 09:39 AM.
Aleksa is offline   Reply With Quote
Old 04-02-2015, 09:40 AM #3
Junior Member
 
Join Date: Apr 2015
Posts: 6
Rep Power: 0
tobivan is on a distinguished road
tobivan tobivan is offline
Junior Member
 
Join Date: Apr 2015
Posts: 6
Rep Power: 0
tobivan is on a distinguished road
Default Re: DIY Laser won't burn anything

I edited my first post the other minute, sorry. I have a second, identical laserdiode with the same results.
The schematic I used is the one with +9V supply:
http://1.bp.blogspot.com/-ewI7TGlE0q...ser_driver.png

Do you have a link/source for a "better" constant current regulator with a mosfet?

How can one see from a picture if the diode is dead or not? I'll try to take a picture ;-)
tobivan is offline   Reply With Quote
Old 04-02-2015, 09:44 AM #4
Aleksa's Avatar
Class 1M Laser
 
Join Date: Jan 2014
Location: Serbia,Nis
Posts: 118
Rep Power: 35
Aleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond repute
Send a message via Skype™ to Aleksa
Aleksa Aleksa is offline
Class 1M Laser
Aleksa's Avatar
 
Join Date: Jan 2014
Location: Serbia,Nis
Posts: 118
Rep Power: 35
Aleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond repute
Send a message via Skype™ to Aleksa
Default Re: DIY Laser won't burn anything

When a LD dies it becomes more like a LED. It produces a weary dim light that looks nothing like laser beam.
Aleksa is offline   Reply With Quote
Old 04-02-2015, 10:33 AM #5
Junior Member
 
Join Date: Apr 2015
Posts: 6
Rep Power: 0
tobivan is on a distinguished road
tobivan tobivan is offline
Junior Member
 
Join Date: Apr 2015
Posts: 6
Rep Power: 0
tobivan is on a distinguished road
Default Re: DIY Laser won't burn anything

I see. Well, the beam definitely looks like a laser beam, but a very dim one. It reaches about 50 cm. The diode itself looks "unharmed" from the outside.
tobivan is offline   Reply With Quote
Old 04-02-2015, 10:37 AM #6
Aleksa's Avatar
Class 1M Laser
 
Join Date: Jan 2014
Location: Serbia,Nis
Posts: 118
Rep Power: 35
Aleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond repute
Send a message via Skype™ to Aleksa
Aleksa Aleksa is offline
Class 1M Laser
Aleksa's Avatar
 
Join Date: Jan 2014
Location: Serbia,Nis
Posts: 118
Rep Power: 35
Aleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond repute
Send a message via Skype™ to Aleksa
Default Re: DIY Laser won't burn anything

Still waiting for the picture
Aleksa is offline   Reply With Quote
Old 04-02-2015, 11:21 AM #7
Junior Member
 
Join Date: Apr 2015
Posts: 6
Rep Power: 0
tobivan is on a distinguished road
tobivan tobivan is offline
Junior Member
 
Join Date: Apr 2015
Posts: 6
Rep Power: 0
tobivan is on a distinguished road
Default Re: DIY Laser won't burn anything

Sorry:
1st one focussed
2nd one "not very focussed"
distance laserdiode-paper roughly 5 cm
http://www.imgbox.de/show/img/WV3I2b9cd9.jpg

http://www.imgbox.de/show/img/B5HLvyl2kg.jpg

EDIT: I used the embed IMG tag, but the pictures won't show up, so sorry about the link.

Last edited by tobivan; 04-02-2015 at 11:23 AM.
tobivan is offline   Reply With Quote
Old 04-02-2015, 12:52 PM #8
Aleksa's Avatar
Class 1M Laser
 
Join Date: Jan 2014
Location: Serbia,Nis
Posts: 118
Rep Power: 35
Aleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond repute
Send a message via Skype™ to Aleksa
Aleksa Aleksa is offline
Class 1M Laser
Aleksa's Avatar
 
Join Date: Jan 2014
Location: Serbia,Nis
Posts: 118
Rep Power: 35
Aleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond repute
Send a message via Skype™ to Aleksa
Default Re: DIY Laser won't burn anything

That's exactly what i'm talking about. That is a dead diode. Your driver has killed them.
Aleksa is offline   Reply With Quote
Old 04-02-2015, 01:26 PM #9
Junior Member
 
Join Date: Apr 2015
Posts: 6
Rep Power: 0
tobivan is on a distinguished road
tobivan tobivan is offline
Junior Member
 
Join Date: Apr 2015
Posts: 6
Rep Power: 0
tobivan is on a distinguished road
Default Re: DIY Laser won't burn anything

Interesting, how do you see that? I mean, the dot looks "small" to me.
But nevertheless I suppose you are right, because otherwise something would happen.
In your schematic: what is "U1 B14" and "Q1 617"? I can't find them.
Thank you very much!
tobivan is offline   Reply With Quote
Old 04-02-2015, 01:35 PM #10
Aleksa's Avatar
Class 1M Laser
 
Join Date: Jan 2014
Location: Serbia,Nis
Posts: 118
Rep Power: 35
Aleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond repute
Send a message via Skype™ to Aleksa
Aleksa Aleksa is offline
Class 1M Laser
Aleksa's Avatar
 
Join Date: Jan 2014
Location: Serbia,Nis
Posts: 118
Rep Power: 35
Aleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond repute
Send a message via Skype™ to Aleksa
Default Re: DIY Laser won't burn anything

If this is your first laser,you will see the difference when you get the new one working.
I dont need to mention that you need to be careful with the laser? If the laser hits your eyes...you will get blinded. Eye protection is needed.
For the driver, i hope you have some good experience with basic electronics,if not,EEVblog on YT is the way to go. When you learn the basics,go to Sams Laser FAQ (holy grail of laser knowledge).
I gave you a simple schematic just so you can see what kind of driver you need. Dont use BJT,use a mosfet instead. For the OP amp,use a lm358.
Have in mind that this is not an efficient way to drive anything. If the diode is working on 2.5v and you have 5v as a supply,2.5v will bi dissipated in the mosfet as heat. Basic learning will cover that.
Aleksa is offline   Reply With Quote
Old 04-02-2015, 03:29 PM #11
Junior Member
 
Join Date: Apr 2015
Posts: 6
Rep Power: 0
tobivan is on a distinguished road
tobivan tobivan is offline
Junior Member
 
Join Date: Apr 2015
Posts: 6
Rep Power: 0
tobivan is on a distinguished road
Default Re: DIY Laser won't burn anything

Thanks Aleksa. I am familiar with electronics, but not with driving a laser diode. As quite a lot of people seem to be happy using a LM317 as constant current source I thought there shouldn't be so much of a problem. I double checked my circuit and could not find any errors in assembly. I am still puzzled and now wondering a) where to buy a new diode b) how to solder a WontKillLaserAgain-driver

Thanks again!
tobivan is offline   Reply With Quote
Old 04-02-2015, 04:48 PM #12
Aleksa's Avatar
Class 1M Laser
 
Join Date: Jan 2014
Location: Serbia,Nis
Posts: 118
Rep Power: 35
Aleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond repute
Send a message via Skype™ to Aleksa
Aleksa Aleksa is offline
Class 1M Laser
Aleksa's Avatar
 
Join Date: Jan 2014
Location: Serbia,Nis
Posts: 118
Rep Power: 35
Aleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond reputeAleksa has a reputation beyond repute
Send a message via Skype™ to Aleksa
Default Re: DIY Laser won't burn anything

Start basic,take it slow,go easy.
You cant run if you cant walk.
Without knowledge time is wasted.
This forum is best on internet,all the information needed to start is here.
There is a search bar on the bottom of the page,have a try at it.
If you need any help,you can always ask and you will get it.
Stay safe and have fun
Aleksa 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 12:21 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