Old 03-22-2014, 05:47 AM #1
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Default Second Project

Hello,

I would like to ask for some advice on laser building. I recently constructed a violet laser and would like to build a blue one. Preferably, this new device would have a power output of 750mW-1000mW. I know how to build the proper driver, but I would like to know which diode I should use, which lens to use (3 element?), and how I should power the laser (which kind of battery and how many). All suggestions are welcome and thanks for your time.


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Old 03-22-2014, 06:04 AM #2
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Default Re: Second Project

For the diode use an M140, you can get it from DTR.

For the lens you use a 3 element coated for blue.

The number of batteries depends on the type of driver you have.
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Old 03-22-2014, 06:24 AM #3
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Default Re: Second Project

Quote:
Originally Posted by ARG View Post
For the diode use an M140, you can get it from DTR.

For the lens you use a 3 element coated for blue.

The number of batteries depends on the type of driver you have.
The driver I will make will be this:

LM317T
100 Ohm Potentiometer
2 10 Ohm resistors in parallel
1N4001 Diode
10 uF 16 or 25 Volt Capacitor

So, if I wanted to get a power of 1000mW, should I give the diode 1 amp of current? If so , would 8 AAs be an appropriate power source?
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Old 03-22-2014, 06:29 AM #4
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Default Re: Second Project

It would be better to use one set resistor rather than that two resistor + potentiometer combo.

For an LM317 you'll need two li-ion cells to power that, or as you suggested 8 AA cells in series. (Though 6 AA cells would make more sense)

For 1W of power 0.9A will probably get you there with an M140.
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Old 03-22-2014, 06:55 AM #5
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Default Re: Second Project

Quote:
Originally Posted by ARG View Post
It would be better to use one set resistor rather than that two resistor + potentiometer combo.

For an LM317 you'll need two li-ion cells to power that, or as you suggested 8 AA cells in series. (Though 6 AA cells would make more sense)

For 1W of power 0.9A will probably get you there with an M140.
So, no potentiometer? In that case, 1.25V/0.9A = 1.4 Ohms... So should I use a 1 ohm resistor? Also, would these Li-ion batteries fit in a 2 AA holder ?
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Old 03-22-2014, 07:49 PM #6
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Default Re: Second Project

You can get common 1.3 ohm or 1.5 ohm resistors
Make sure they are rated for the power P=(1.25^2)/resistor value

You can get li-ions that would fit into a 2AA holder.

-Alex
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Old 03-22-2014, 07:58 PM #7
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Default Re: Second Project

Quote:
Originally Posted by ARG View Post
You can get common 1.3 ohm or 1.5 ohm resistors
Make sure they are rated for the power P=(1.25^2)/resistor value

You can get li-ions that would fit into a 2AA holder.

-Alex
Thanks so much for your replies! I will put your advice to good use, and I'll post results when I can.
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