Old 10-31-2016, 07:19 PM #1
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Default Help with White Laser

Hi. I want to make an multicolor laser with 3 adjustable laser modules. I just don't know the right way to go about making one. I was thinking I should just get the 3 laser modules (w/ driver) and stick a potentiometer between the power supply for each laser. Is there a better way? Would something like this work?
LM317 AC/DC Adjustable Voltage Regulator Step-down Power Supply Module W/LED TA | eBay


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Old 10-31-2016, 07:37 PM #2
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Default Re: Help with White Laser

You can buy those cheap on ebay all set up and ready to play fairly cheaply, although the cheap ones don't play long before a diode failure, I've heard. Opt Laser sells a nice single mode RGB to white module for 500 bucks which should last, quality costs.
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Old 10-31-2016, 09:48 PM #3
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Default Re: Help with White Laser

Quote:
Originally Posted by Dog View Post
I was thinking I should just get the 3 laser modules (w/ driver) and stick a potentiometer between the power supply for each laser.
That doesn't work - you need to look for a laser with a driver that has "analogue modulation". You can then use a 5V supply and pot. to control output via the analogue modulation input.
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Old 11-01-2016, 09:39 AM #4
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Default Re: Help with White Laser

Quote:
Originally Posted by Alaskan View Post
I've heard. Opt Laser sells a nice single mode RGB to white module for 500 bucks which should last, quality costs.
Yes I've heard that too.
Mine arrived yesterday and I'm so excited and nervous.
BTW, the service from OPT Lasers is exceptional.
Contact Mateusz, he's very helpful.

Quote:
Originally Posted by diachi View Post
That doesn't work - you need to look for a laser with a driver that has "analogue modulation". You can then use a 5V supply and pot. to control output via the analogue modulation input.
I'm doing some research to work out the best way to implement this, I may need some help from you guys.
It's been years and years since I've done any proper electronics.

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Old 11-01-2016, 10:48 AM #5
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Default Re: Help with White Laser

OMG, I want four of those to knife edge into a 4X white beam! Please show a photo of the unit next to something I know the size of, I want to see how tiny they are.
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Old 11-02-2016, 01:09 AM #6
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Default Re: Help with White Laser

Quote:
Originally Posted by Alaskan View Post
OMG, I want four of those to knife edge into a 4X white beam! Please show a photo of the unit next to something I know the size of, I want to see how tiny they are.
Ok here you go.




















Cheers
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Old 11-02-2016, 04:46 PM #7
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Default Re: Help with White Laser

Wow, even smaller than I thought.... Even though I know the size of those laser modules, seeing that photo next to the 26650 battery sure shows how tiny it is. Are you going to have a host made to hold it inside a pointer?
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Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

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Old 11-02-2016, 09:38 PM #8
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Default Re: Help with White Laser

Quote:
Originally Posted by Alaskan View Post
Wow, even smaller than I thought.... Even though I know the size of those laser modules, seeing that photo next to the 26650 battery sure shows how tiny it is. Are you going to have a host made to hold it inside a pointer?
Yeah they're pretty small.
I was glad about that because I was worried it'd be too big to fit into a build.

I'm going to keep it as a 'bench test' unit until I figure out how to drive it.
I'm trying to learn Arduino so that I can set it up the way I'm envisioning it in my mind, then I'll look into getting a host made up.
Baby steps.....

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For God so loved the world that He gave His only begotten Son, that whoever believes in Him
should not perish but have everlasting life.
For God did not send His Son into the world to condemn the world,

but that the world through Him might be saved.
“He who believes in Him is not condemned;
but he who does not believe is condemned already, because he has not believed in the name of the only begotten Son of God.
And this is the condemnation, that the light has come into the world, and men loved darkness rather than light, because their deeds were evil.
For everyone practicing evil hates the light and does not come to the light, lest his deeds should be exposed.
But he who does the truth comes to the light, that his deeds may be clearly seen, that they have been done in God.”
(John 3:16-21)
─────────────────────────────────☀
If you confess with your mouth, “Jesus is Lord,” and believe in your heart that God raised Him from
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Old 11-03-2016, 12:17 AM #9
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Default Re: Help with White Laser

I only have around $80 to spend and was hoping for a ~500mw total output with this this (100mw) and this (The 3 modules). I already have the heat sinks, dichros, and a bunch of 18650s for the project which leaves about $30 for the 3 things that will let me control the output of the lasers. Why wouldn't 3 volt regulators work?
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Old 11-03-2016, 01:50 AM #10
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Default Re: Help with White Laser

Quote:
Originally Posted by Dog View Post
I only have around $80 to spend and was hoping for a ~500mw total output with this this (100mw) and this (The 3 modules). I already have the heat sinks, dichros, and a bunch of 18650s for the project which leaves about $30 for the 3 things that will let me control the output of the lasers. Why wouldn't 3 volt regulators work?

For one, those lasers already have drivers built in so current to the diode is already being regulated by that, adjusting input voltage won't have an effect assuming the drivers are actually any good (other than the lasers turning off when the voltage is too low). Even if they aren't good regulators, adjusting the input voltage likely won't give the result you're looking for. You'd need to replace the drivers on the lasers entirely.
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Last edited by diachi; 11-03-2016 at 05:09 AM.
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Old 11-03-2016, 02:33 AM #11
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Default Re: Help with White Laser

While trying to source parts for my RGB-V lumia build, I found that a blue module in a lower power level was difficult to get. Both red (650nm), and green (532nm) were easy, but nobody had anything in the blue spectrum. So I ended up building my own 445nm module.
Also beware that some sellers will say that they have blue modules, when in fact they are violet (405nm)!
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Old 11-03-2016, 03:33 AM #12
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Default Re: Help with White Laser

So would this, this, and this solve my problem? And would 405nm still work to make white light if I give it a little more power?
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Old 11-03-2016, 05:16 AM #13
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Default Re: Help with White Laser

Quote:
Originally Posted by Dog View Post
So would this, this, and this solve my problem? And would 405nm still work to make white light if I give it a little more power?

No, they all have TTL modulation - you'd need to use PWM with those to adjust brightness.

Yes, you can do white with 405nm, that said, I find it's a nicer white if you use 445nm. 200mW may not be enough power with 100mW 532nm.

See: My RGV is Alive!

And: FS: White Fusion Laser Mixing Kit
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Old 11-03-2016, 08:47 AM #14
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Default Re: Help with White Laser

Well I hope I haven't hijacked this thread but I wanted to share this with you.
I fired up the unit today to test it out and WOW !
A beautiful WHITE BEAM greeted me.
Then by adjusting the various voltages on the RGB channels I got these beautiful array of colours.
This was a quick test BTW.

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For God so loved the world that He gave His only begotten Son, that whoever believes in Him
should not perish but have everlasting life.
For God did not send His Son into the world to condemn the world,

but that the world through Him might be saved.
“He who believes in Him is not condemned;
but he who does not believe is condemned already, because he has not believed in the name of the only begotten Son of God.
And this is the condemnation, that the light has come into the world, and men loved darkness rather than light, because their deeds were evil.
For everyone practicing evil hates the light and does not come to the light, lest his deeds should be exposed.
But he who does the truth comes to the light, that his deeds may be clearly seen, that they have been done in God.”
(John 3:16-21)
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If you confess with your mouth, “Jesus is Lord,” and believe in your heart that God raised Him from
the dead, you will be saved.
For it is with your heart that you believe unto righteousness
and it is with your mouth that you confess
your faith and
are saved.
(Romans 10:9-10)
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Old 11-03-2016, 10:03 AM #15
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Default Re: Help with White Laser

That white laser is really cool. What outputs would you recommend for me if I want to keep the 100mw green? And the cheapest analogue modulated driver modules I found will add up to over $200!
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Old 11-03-2016, 11:39 AM #16
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Default Re: Help with White Laser

Myself, I am not quite sure what you are asking, for a green laser recommendation?

Very nice RB astro, thank you for the photo's, all on topic, so I don't see a high jack here. The colors are very nice, I see you made different combinations, nice. I have a request kind sir, could you please take some night shots of the beam for us, maybe even a sky beam shot if willing to do that?
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Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

Useless troll fighting.
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