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Old 04-02-2011, 11:50 AM #1
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Default Running a 445nm diode at 30mW

Hi all,

If I want to run a 445nm diode at a tiny 30mW, is there any need for a driver, or can I just use a current limiting resistor?


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Old 04-02-2011, 12:05 PM #2
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Default Re: Running a 445nm diode at 30mW

If you want a stable 30mW, you will need a driver anyway.
Just using a limiting resistor your output starts at some value and continously
decreases from there as the batteries discharge.
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Old 04-02-2011, 12:15 PM #3
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Default Re: Running a 445nm diode at 30mW

Quote:
Originally Posted by anselm View Post
If you want a stable 30mW, you will need a driver anyway.
Just using a limiting resistor your output starts at some value and continously
decreases from there as the batteries discharge.
Thanks - good point about the battery voltage dropping.
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Old 04-02-2011, 05:38 PM #4
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Default Re: Running a 445nm diode at 30mW

you especially need adriver. if you direct drive it you get the batteries full power.

also i believe if you want 30 mw you need to set your driver around like 200ma. but search for that first, or if you have a laser power meter even better.,

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Old 04-03-2011, 03:51 AM #5
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Default Re: Running a 445nm diode at 30mW

I'm sure I read somewhere that the threshold for these diodes was around 220ma and would start to lase at about 10 mW. At these levels it was reported that they were VERY unstable.
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Old 04-03-2011, 04:15 AM #6
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Default Re: Running a 445nm diode at 30mW

i think they are stable, albeit a high current and a low mw ratio. but i believe i have read that under 50mw these diodes are single mode which means you will get a better beam.

i have no experience with it at this low power though.

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Old 04-03-2011, 04:57 AM #7
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Default Re: Running a 445nm diode at 30mW

Get one of the eBay ItemQuickShip 405nm pens for $8. Their drivers work and are 200mA max. There's a thread about low powered blue pens somewhere that talks about it a bit more, and has a pic of someone who made one in this way.


Edit: Found the thread: cheap, AAA powered, ~20-30mw blue pen?
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Old 04-04-2011, 04:08 AM #8
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Default Re: Running a 445nm diode at 30mW

Quote:
Originally Posted by Grunff View Post
Hi all,

If I want to run a 445nm diode at a tiny 30mW, is there any need for a driver, or can I just use a current limiting resistor?
A resistor will work fine with a #18650 battery.

You will have to test it to get the proper value of resistance.

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