RED laser from DVD-RW

[boraicho]

i'm right now bought this laser diode. i won auction for 6,51$, nice
LPC-826 Mitsubishi 658nm 660nm 300 400mW CW Red Laser Diode LPC 826 | eBay
and how much current i have use? yes, i know, that they write that i have use 400mA but on other site is wrote other current.

 

[The Lightning Stalker]

That is the exact same diode.

 

[boraicho]

Hi, i built driver 10 minutes ago.
input 5V (max 5,5V) output 0-500mA
http://fastimages.eu/images/dsc03473.jpg
http://fastimages.eu/images/dsc03471.jpg

 

[The Lightning Stalker]

Wow, getting more complicated I see. Very nice. I would +REP, but the forum forbids me.

 

[boraicho]

yet two picture, size and max current.
i will make some testing tomorrow.
http://fastimages.eu/images/pa231863.jpg
http://fastimages.eu/images/pa231864.jpg
http://fastimages.eu/images/cc.gif

 

[boraicho]

Hi. I am bought few years ago this Red Laser Module - Focusable Dot (3.5V~4.5V 11.89mm 5mW) - Free Shipping - DealExtreme
it's good choise join it with this?? Mitsubishi 658nm 660nm 300 400mW CW Red Laser Diode LPC 826 | eBay

or what combination is better? thanks.

 

[The Lightning Stalker]

Those will work okay. They are probably made of brass. More power can be squeezed from a copper
module. DTR is about the cheapest place to pick those up.

 

[boraicho]

What is DTR?

 

[The Lightning Stalker]

https://sites.google.com/site/dtrlpf/home/diodes

 

[elian]

Hello everybody...take the chance to ask question: I have a laser diode chip (300x200x100um) on silicon 5mW, max 30mA. I need to drive this LD and I cannot use any feedback photodiode. Any suggestions? I can buy or design one...same for me. Thansk a lot

 

[The Lightning Stalker]

Okay, first wow how did you measure something so small? Second, you can use something like this:

 

[elian]

Hi, thanks a lot.
I have in on silicon submount. I glue it on PCB and then i can measure. Since I can have MCU I was thinking to use PIC16 for PWM signal and the NU501 to regulate the current in the LD. Could you comment on it?thansk a lot

 

[The Lightning Stalker]

You're welcoem. I've never used the NU501 before, but after reviewing the datasheet, it looks like it
should be doable. Just include the capacitor across the diode as above to help control overshoot. So
say you use the 1B30, you would attach the PWM from the PIC to the Vdd pin on the NU501 as
outlined in the datasheet. I would also recommend testing this with a few signal diodes in series, such
as the 1N4148 in place of the laser diode and an oscilloscope. You're trying to match the voltage drop of
your laser diode. Put a 1Ω 1% carbon or film (non-inductive!) resistor in series with the diodes and the
oscilliscope probe across the resistor. You will then get 1mV for every mA. Watch that the output never
goes above 30mA under any circumstances and you should be golden globes.

This all sounds like a lot of fun. I wish I had a few of those bare silicon wafers here to play
around with. Let us know how it all turns out.

 

[elian]

sure. thanks a lot!