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

Max current for a open can diode from LG H55N

Xenom

Xenom

0
Joined
Feb 8, 2009
Messages
69
Points
0
Hi guys. I get a 22x LG dvd burner: GSA-H55N. I extracted an open can laser diode. I read around which the laser diodes from a 20/22x runs on about 400 mA.
So, after placing it in a optic module, i supplied it with about 400 mA and it works well. The "problem" is: beam intensity is very similar to another laser i built from a 16x dvd burner, running at 300 mA.
This fact let me think which i could get more current form my new DL.

Do you know how many mA can i supply into this DL (LG H55N dvd burner)?
Also: need i a heatsink on the optical module? I bought the laser module on dealextreme, is similar to the common axxis module. When i run the DL at 400 mA the heat generated by the module isnt' so high.

Thanks in advance.
 
Last edited:





Gadget

Gadget

0
Joined
Dec 28, 2013
Messages
358
Points
43
I just sacrificed two of those drives not long ago. The tray motor took a dump on mine so I salvaged the diodes and optics. The other came from a $12 refurb drive from MicroCenter. Same exact drive though.

The red diode in that drive is either an LPC-815, or an LPC-826. I'm not sure which because I salvaged two identical drives a week or so apart, and one of the diodes barfed at ~370mA, while the remaining one is purring along just fine at ~480mA.

They're most likely the 826, because I don't think the 815 would take too kindly to >450mA.

And, YES...YES...YES...if you're gonna push your diode up to LPC-826 currents, you'd do yourself, and your diode, a favor to put the module in a heatsink. If you run it in the module sans heatsink, use VERY conservative duty-cycles.

For what it's worth,
-G
 
Last edited:
Xenom

Xenom

0
Joined
Feb 8, 2009
Messages
69
Points
0
Gadget said:
I just sacrificed two of those drives not long ago. The tray motor took a dump on mine so I salvaged the diodes and optics. The other came from a $12 refurb drive from MicroCenter. Same exact drive though.

The red diode in that drive is either an LPC-815, or an LPC-826. I'm not sure which because I salvaged two identical drives a week or so apart, and one of the diodes barfed at ~370mA, while the remaining one is purring along just fine at ~480mA.

They're most likely the 826, because I don't think the 815 would take too kindly to >450mA.

And, YES...YES...YES...if you're gonna push your diode up to LPC-826 currents, you'd do yourself, and your diode, a favor to put the module in a heatsink. If you run it in the module sans heatsink, use VERY conservative duty-cycles.

For what it's worth,
-G
Click to expand...

Thanks Man. So I think i'm already at the laser limit. I hoped a more intense beam, it looks like a common 16x dvd burner DL.
 
alessnilsen

alessnilsen

0
Joined
May 20, 2013
Messages
358
Points
28
Hello!

I worked with many DVD-RW drives and the H55N is my favourite to get LD's.
I have 98% sure that is a LPC-815 diode. I always ran it at 415mA and never burnt a diode at this current. But I found two variations of the housing from this drive.

2014-04-05%2014.14.11.jpg


Maybe one was the cited LPC-826 and one the LPC-815, but I don't believe that the LD's are different.

So, after placing it in a optic module, i supplied it with about 400 mA and it works well. The "problem" is: beam intensity is very similar to another laser i built from a 16x dvd burner, running at 300 mA.
Click to expand...

Did you measured the brightness with a LPM? Seeing it by eye is very subjective and prone to errors. I have a LPC-815 laser running at 300mA, when side by side with the same LD running at 415mA the difference is very small in the brightness.
 
Xenom

Xenom

0
Joined
Feb 8, 2009
Messages
69
Points
0
alessnilsen said:
Hello!

I worked with many DVD-RW drives and the H55N is my favourite to get LD's.
I have 98% sure that is a LPC-815 diode. I always ran it at 415mA and never burnt a diode at this current. But I found two variations of the housing from this drive.

2014-04-05%2014.14.11.jpg


Maybe one was the cited LPC-826 and one the LPC-815, but I don't believe that the LD's are different.



Did you measured the brightness with a LPM? Seeing it by eye is very subjective and prone to errors. I have a LPC-815 laser running at 300mA, when side by side with the same LD running at 415mA the difference is very small in the brightness.
Click to expand...

Unfortunatly i don't have LPM, i tried it at 400 mA, the brightness does not increase significantly at eye looking; i hoped in a better beam visibility
 
alessnilsen

alessnilsen

0
Joined
May 20, 2013
Messages
358
Points
28
That's what ~250mW looks like, red is not a very visible color, but don't be tricked, still 250mW.

:yh:
 
You must log in or register to reply here.




Top