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Old 07-13-2011, 09:14 PM   #1
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Exclamation A Little Help... Or a Lot

Hey! My name is craig and i just signed up today. Ive used this forum for information for a long time now, so i figured instead of searching through old threads for answers i may or may not find, i should probably just ask my question.

So,
i am building a blu ray laser into a flashlight. for the driver, ill be using an lm317, a resistor of undetermined value, and a .1 uF capacitor.

This is the diode - New 100mW 405nm Blue-Violet blu-ray Laser Diode | eBay

im guessing its a 5.6mm? i hope so. im very low budget here, so buying anything in excess of 10-15$ isnt really going to work. So i was wondering

A: Is there a better, more reliable diode for the same price range?
B: What is the best module to put this diode in?
C: How should i set my driver?
D: What is the best voltage to run this diode at?

I would really appreciate any help i could get.
Thanks in advance!!

Craig
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Old 07-13-2011, 09:22 PM   #2
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Default Re: A Little Help... Or a Lot

Scratch that, ill be using this diode... PHR-805T laser diode 405nm 100-120mW [M0025] - $9.99 : Modwerx Shop
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Old 07-13-2011, 09:25 PM   #3
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Default Re: A Little Help... Or a Lot

I believe the ma to mw ratio is about 1:1, but there are some graphs around that have more accurate information. Aixiz module would be your best bet, phr 805t is 5.6mm. I believe these need 4.5v to run, but you could use a boost driver.
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Old 07-13-2011, 09:26 PM   #4
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Default Re: A Little Help... Or a Lot

For that diode there should be a tutorial about how to build it and power it. I believe you can use a 9v volt battery(edit never mind don't try that) for it if you set the driver right , but don't take my word on it.

Last edited by joeyss; 07-13-2011 at 09:27 PM.
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Old 07-13-2011, 09:30 PM   #5
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Default Re: A Little Help... Or a Lot

This is actually going to be my first laser that ill be constructing completely. im 17 and i major in electronics at my high school, so i have a decent idea of what to do, i just want to make sure i dont break my diode (cost -_-) and that i can get a good amount of use out of it. will i need a heatsink? its running at a medium wattage...
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Old 07-13-2011, 09:34 PM   #6
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Default Re: A Little Help... Or a Lot

Quote:
Originally Posted by craigrose View Post
Hey! My name is craig and i just signed up today. Ive used this forum for information for a long time now, so i figured instead of searching through old threads for answers i may or may not find, i should probably just ask my question.

So,
i am building a blu ray laser into a flashlight. for the driver, ill be using an lm317, a resistor of undetermined value, and a .1 uF capacitor.

This is the diode - New 100mW 405nm Blue-Violet blu-ray Laser Diode | eBay

im guessing its a 5.6mm? i hope so. im very low budget here, so buying anything in excess of 10-15$ isnt really going to work. So i was wondering

A: Is there a better, more reliable diode for the same price range?
B: What is the best module to put this diode in?
C: How should i set my driver?
D: What is the best voltage to run this diode at?

I would really appreciate any help i could get.
Thanks in advance!!

Craig
No, no Craig. LPF helps those that help themselves. That was pretty lazy of you there. If you've been using the forum for information for a, "long time now", you should know how we operate. In fact you should know the answer to most of your questions too.

Please try harder. All the answers are there and you only have to search...

Let's see if you can find routes to any of that information you're after in the link in my sig.

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Another good guide can be found here from goninanbl00d - "First Build Guide"
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Assembly services, parts machined and consultations for specialist builds available. PM me if you need something. Thanks.
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Old 07-13-2011, 09:45 PM   #7
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Default Re: A Little Help... Or a Lot

well morgan, i was just looking for a quick bit of PERSONALIZED advice. i get what you were saying though lol and i've been to your "i want to build a laser" (which i think is awesome btw, good job) do you think that it would be completely necessary to heatsink that diode?
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Old 07-13-2011, 10:03 PM   #8
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Default Re: A Little Help... Or a Lot

Quote:
Originally Posted by craigrose View Post
well morgan, i was just looking for a quick bit of PERSONALIZED advice. i get what you were saying though lol and i've been to your "i want to build a laser" (which i think is awesome btw, good job) do you think that it would be completely necessary to heatsink that diode?
If you are going to run it at +100mA for longer than a few seconds, you will absolutely need a heatsink.
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Old 07-13-2011, 10:12 PM   #9
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Default Re: A Little Help... Or a Lot

A: Is there a better, more reliable diode for the same price range?
Nope....there are GGW and sf-aw210 diodes that are about double the output, but cost about double the price.
there are also 8x and 12x diodes that can reach >700mW, but they can run you around $50 a pop. Not something you want to risk if your inexperienced in building lasers.

B: What is the best module to put this diode in?
Aixiz. It's the "standard" for all our 5.6mm diodes.
Laser focusing module for 5.6mm laser diodes (adjustable focus) [M0022] - $3.99 : Modwerx Shop

C: How should i set my driver?
You use a test load to visually see what your driver is outputting using a voltage meter. You can also calculate it. (1.25 / ohms = current)
example: 1.25 / 33.3ohm = 0.03754, so it would add approximately 37mA
you can just combine different resistors to get the desired current.
This method allows you to use fixed resistors instead of pots and does not require the use of a test load and digital multi meter to set your driver's output current.

D: What is the best voltage to run this diode at?
If i recall correct, the dropout voltage of the lm317 is like 2.25V, and the input voltage for the PHR diode is 5v. So your going to need a minimum of 7.25V to even power it.
Most people use 2x 4.25v rechargeable lithium.

Hope that helps.

Last edited by Mohrenberg; 07-13-2011 at 10:13 PM.
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Old 07-13-2011, 10:29 PM   #10
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Default Re: A Little Help... Or a Lot

Also, those diodes are REALLY sensitive to ESD to make sure you use all precautions. At minimum use a grounded wrist strap. Use a test load (dummy load) to verify the current of your driver, you can build one very cheap.

See here: Laser driver - It can be done
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Old 07-13-2011, 10:43 PM   #11
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Default Re: A Little Help... Or a Lot

Quote:
Originally Posted by craigrose View Post
well morgan, i was just looking for a quick bit of PERSONALIZED advice. i get what you were saying though lol and i've been to your "i want to build a laser" (which i think is awesome btw, good job) do you think that it would be completely necessary to heatsink that diode?
The only answer you wouldn't have found is the one about similar diodes. Usually the diodes mentioned and sold here are the best value for the output so you're not likely to find mention of others. It's only price for that diode that you can look for.

The other answers you should be able to find.

I wasn't being tetchy. I've seen a lot of folks get answers really quickly to questions and are therefore actively encouraged not to bother looking for themselves. The best way to get answers from all reading your question posts is to link to places you've checked out that haven't answered your questions or at least show you've tried to look. Saying, "I can't be bothered to look so I'm just going to ask...", (or similar), will illicit little response from most.

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Do you want to build a laser? But, you know nothing about what is needed, right? Then you need to try the, "I Want to Build a Laser", thread! Everything you wanted to know to get started and more! An easy guide as to what you need and why!

Another good guide can be found here from goninanbl00d - "First Build Guide"
(Temporarily Unavailable)

" ... Lasing on a sunny afternoon." The Kinks.

"Lasing on a Sunday Afternoon." Queen.

" Lase-y Sunday afternoon, I've got no mind to worry... " Small Faces.

"... Yes. It died during the night... So I cooked it! It was very nice." My Dad

Assembly services, parts machined and consultations for specialist builds available. PM me if you need something. Thanks.

Last edited by Morgan; 07-13-2011 at 10:44 PM.
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Old 07-13-2011, 11:01 PM   #12
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Default Re: A Little Help... Or a Lot

i understand, and thanks all for the tips =D
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