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Old 03-06-2017, 08:44 PM #1
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Default Controlling Laser Diode With a Microcontroller

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...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:


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.


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Old 03-06-2017, 09:18 PM #2
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Default Re: Controlling Laser Diode With a Microcontroller

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?



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.
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405nm | Banggood LT-850 | "5mW" | Review Unit | Review WIP
445nm | Sanwu Laser Pocket Series | 400mW Metered
445nm | NDB7242E Pen Build | 60mW Metered | >>Build Thread<<
450nm | LaserPointerStore - Thor H2 | 1W(?) | Review Unit | >>Review<<
488nm | Spectra Physics 163 Argon | ~30mW Metered
515nm | PL515 Pen Build | 50mW Metered | >>Build Thread<<
520nm | Laserlands 520 | 5mW | Review Unit | 3mW metered | >>Review<<
532nm | Gearbest 303 Pointer | 50mW Metered
532nm | Gearbest JD-850 Pointer | 30mW Metered (I think, need to re-test).
633nm | HeNe | 6mW
633nm | Spectra Physics 155 HeNe | <1mW >>Thread<<
650nm | Sanwu Laser Pocket Series | 200mW Metered
808nm | Melles Griot 532nm Lab Unit | No Crystals >10W | X2



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Last edited by diachi; 03-06-2017 at 09:21 PM.
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Old 03-06-2017, 09:37 PM #3
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Default Re: Controlling Laser Diode With a Microcontroller

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
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Old 03-06-2017, 09:48 PM #4
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Default Re: Controlling Laser Diode With a Microcontroller

Quote:
Originally Posted by Gamer0126 View Post
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.
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405nm | Banggood LT-850 | "5mW" | Review Unit | Review WIP
445nm | Sanwu Laser Pocket Series | 400mW Metered
445nm | NDB7242E Pen Build | 60mW Metered | >>Build Thread<<
450nm | LaserPointerStore - Thor H2 | 1W(?) | Review Unit | >>Review<<
488nm | Spectra Physics 163 Argon | ~30mW Metered
515nm | PL515 Pen Build | 50mW Metered | >>Build Thread<<
520nm | Laserlands 520 | 5mW | Review Unit | 3mW metered | >>Review<<
532nm | Gearbest 303 Pointer | 50mW Metered
532nm | Gearbest JD-850 Pointer | 30mW Metered (I think, need to re-test).
633nm | HeNe | 6mW
633nm | Spectra Physics 155 HeNe | <1mW >>Thread<<
650nm | Sanwu Laser Pocket Series | 200mW Metered
808nm | Melles Griot 532nm Lab Unit | No Crystals >10W | X2



Check out my Reddit Subreddit! >>/r/laserpointers<<

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Old 03-07-2017, 01:55 AM #5
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Default Re: Controlling Laser Diode With a Microcontroller

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.
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Old 03-07-2017, 03:49 PM #6
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Default Re: Controlling Laser Diode With a Microcontroller

Quote:
Originally Posted by Gamer0126 View Post
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...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:


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....

Quote:
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
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Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






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