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

Controlling Laser Diode With a Microcontroller

Joined
Feb 27, 2017
Messages
7
Points
0
I want to purchase the following items, shown below, but I want to confirm in the application I will not burn out the laser or the Darlington BJT. If anyone has experience with these items please chime in.

- 12X S06J 405nm Diode https://sites.google.com/site/dtrlpf/home/diodes/s06j-12x-405-diodes
- 12X S06J 405nm Diode In 12mm Copper Module w/ Nano Buck/Boost Driver
: With 3 Element Glass Lens

I want to do the following configuration:
8d201a76-6cf7-48c4-9d55-d8e2e8664c23.jpg


For the case above My questions would be:
- The laser is rated at 450mW but I would like to under power it to around 100mW, does the Driver allow for the control to lower the power output?
- Would the Nano Buck/Boost Driver(which replaces the LM317T,R1 and R2) work with a 100ohm resistor (R3) and a NTE2315?
- If anyone has recommendations for lower power parts, feel free to share. I have not found a place where I can get the parts within the week.

I already have a closed environment lab where I will be working with a lab partner with Safety Glasses, so no windows and extra safety precautions will be taken.
 





diachi

0
Joined
Feb 22, 2008
Messages
9,700
Points
113
You already have a thread on this? Why not bump that rather than creating a new thread?

I wouldn't put the NPN there, I'd put it on the input to the LM317. The LM317 is going to try and maintain constant current in that configuration, so it'll ramp up the output voltage as you turn the NPN off. Putting it on the input pin will give you the ability to turn on/off, but not change intensity. You need to do that with the current set resistor/pot in this (LM317) configuration. Or use a different driver that has analogue modulation. Not sure what purpose the diode on the input pin of the LM317 serves?

Do you need to modulate this with any sort of speed? Or just turn it off and on?

ldschpcb.gif


The above driver is capable of analogue modulation. Output maximum current is set with R11, you'd just need to pick a value for R11 that drives the LD at the current you want, then you can adjust intensity with a 0-5V signal applied to the modulation input.
 
Last edited:
Joined
Feb 27, 2017
Messages
7
Points
0
Thank you for the response. Sorry for the multi-thread. I just thought this was more a specific question to the parts listed above.

I don't need to modulate it, I would like to turn it off and on.

I was wondering if with this driver:
- 12X S06J 405nm Diode In 12mm Copper Module w/ Nano Buck/Boost Driver.

Do I still have the ability to change the current to the laser, from the website there is another nano driver with configurations but not sure if the two are the same nano drivers? Or for my use would I be better off with the LM317 driver?

Ok, good to know about putting the NPN at the input pin.

Thanks again for the
 

diachi

0
Joined
Feb 22, 2008
Messages
9,700
Points
113
Thank you for the response. Sorry for the multi-thread. I just thought this was more a specific question to the parts listed above.

I don't need to modulate it, I would like to turn it off and on.

I was wondering if with this driver:
- 12X S06J 405nm Diode In 12mm Copper Module w/ Nano Buck/Boost Driver.

Do I still have the ability to change the current to the laser, from the website there is another nano driver with configurations but not sure if the two are the same nano drivers? Or for my use would I be better off with the LM317 driver?

Ok, good to know about putting the NPN at the input pin.

Thanks again for the


Not sure on that driver - best to e-mail DTR and ask if the included driver is adjustable via pot or if there's only set resistors at a few steps. You'd be better with the Nano driver if you can get it set to the current you want - again, ask DTR.

Then to turn on/off you can just turn on/off the supply voltage to the built in driver.
 

WizardG

0
LPF Site Supporter
Joined
May 9, 2011
Messages
1,170
Points
113
The nano driver DTR pairs up with these diodes has a soft start feature. If you need fast response when you tell the circuit to turn the laser on then you might want to go with the circuit Diachi has helpfully provided.
 
Joined
Sep 20, 2008
Messages
17,622
Points
113
I want to purchase the following items, shown below, but I want to confirm in the application I will not burn out the laser or the Darlington BJT. If anyone has experience with these items please chime in.

- 12X S06J 405nm Diode https://sites.google.com/site/dtrlpf/home/diodes/s06j-12x-405-diodes
- 12X S06J 405nm Diode In 12mm Copper Module w/ Nano Buck/Boost Driver
: With 3 Element Glass Lens

I want to do the following configuration:
8d201a76-6cf7-48c4-9d55-d8e2e8664c23.jpg


For the case above My questions would be:
- The laser is rated at 450mW but I would like to under power it to around 100mW, does the Driver allow for the control to lower the power output?
- Would the Nano Buck/Boost Driver(which replaces the LM317T,R1 and R2) work with a 100ohm resistor (R3) and a NTE2315?
- If anyone has recommendations for lower power parts, feel free to share. I have not found a place where I can get the parts within the week.

I already have a closed environment lab where I will be working with a lab partner with Safety Glasses, so no windows and extra safety precautions will be taken.

I positively hate responding to two identical Threads.
Why not read and understand the posts on the 1st
Thread and do some basic testing.. Have you tried
what was suggested ??

Here is a quote to remind you....

You have a basic circuit to control a Laser or LED with a current
limited Driver that can be modulated by a micro-controller.

I would suggest that you get an actual and safe 5mW Red Laser
to build and test your experiment before you use any High Powered
Laser.

Jerry
 




Top