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Old 03-24-2009, 06:05 PM #1
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Default Changing LD on a Romisen laser

Hey people

I got a Romisen L-B030 ( http://www.dealextreme.com/details.dx/sku.10557 ) yesterday, and i'm not disapointed, but i would like to change the diode. The 30 mW Romisen leaks some IR, but if i change the diode to ~50 mW and put an IR filter on, wouldn't it be safer / the same as the one i got now? I would like to have a better laser, but i won't risk my eyes. (I don't wear glasses when using, but i don't use it much inside and avoids reflective surfaces.)

So please, tell me what module and LD which will fit in this housing, and the driver to. Thanks

I can solder it, but i won't make my own tricky driver and that stuff...

I hope you will help

EDIT: Another question: Where can i buy cheap IR filter? And when you buy ir filter, you normally get 1x1cm, a laser only needs around 25mm right? So you can use one plate for 4 lasers? I mean if the laser "hole" isn't wider.
(Btw, i've heard that webcams has IR filter on them, does these work O.K.?)


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Old 03-25-2009, 12:34 AM #2
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Default Re: Changing LD on a Romisen laser

Replacing the diode on a green laser is very hard to do, you have to align the IR diode with the crystals perfectly so you get the most green out. Your laser has a 200mW IR diode in it...so just leave that one alone. You can get an IR filter for $1 off of www.optotronics.com .
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Old 03-25-2009, 01:18 AM #3
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Default Re: Changing LD on a Romisen laser

Upping the input voltage(.2-.6 volts) is the "safest" way to increase power. The pump diode is probably a standard 200mw IR being underdriven...

As for replacing the diode, it isn't as difficult as it seems. The diode can be removed by unscrewing the retaining ring on the back of the module. As for alignment, I'm not sure it matters too much since most cheap pointers use composite crystals...
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Old 03-25-2009, 06:21 AM #4
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Default Re: Changing LD on a Romisen laser

styropyro

Thanks! Thats cheap! They cost 10$ other places.. Minimum buy reqiurement 20$.. I'm sure i'll find something.



digital_blue

Do i up the voltage by pot mod it slightly?


I also think i'll make the "Pocket Pal" laser, there's nothing special to know, that is not in the guide?
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Old 03-25-2009, 04:31 PM #5
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Default Re: Changing LD on a Romisen laser

I'll use this thread to ask another question:

I'm planning on making the pocket pal or another blu-ray laser, using the small "flexdrive".

Lets say that its on 100mW, can i just open the laser, "pot mod" it down to like 10mw? I mean for indoor use? One more question: How dangerous is Blu-Ray compared to green lasers at same mW
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Old 03-25-2009, 07:59 PM #6
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Default Re: Changing LD on a Romisen laser

Quote:
Originally Posted by jonasa0601
Lets say that its on 100mW, can i just open the laser, "pot mod" it down to like 10mw? I mean for indoor use? One more question: How dangerous is Blu-Ray compared to green lasers at same mW
Power is power, 100mw of green will do the same thing as 100mw of red, violet, UV, IR, etc. 100mw of violet is not excessive for indoor use, just get the appropriate safety goggles.

Quote:
Do i up the voltage by pot mod it slightly?
Do NOT potmod the laser. Use a higher voltage battery or input voltage. RCR123 primaries only output 3 volts while rechargable CR123s give off 3.5-3.7 volts.
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Old 03-25-2009, 08:47 PM #7
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Default Re: Changing LD on a Romisen laser

Digital_blue okay, simple as that?
And if i make a Blu-ray one, i can just put lower voltage battery in, and the output will more indoor usefull.

If 6V gives 100mw(i don't know if this is true), will a 3V battery give around the half?
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Old 03-25-2009, 09:31 PM #8
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Default Re: Changing LD on a Romisen laser

NO! Green and violet lasers are like apples and oranges. One is a (set of) crystals pumped by a powerful IR diode (green), the other is a plain laser diode (violet and red). For the green, you can pot mod them because the circuitry allows you to increase the current to the IR diode by increasing the voltage. For the violet, they regulate the current using a voltage regulator or a boost circuit. Adding more voltage will not increase current with such drivers, and with some designs, such as the Flexdrive, you may actually provide too much voltage and burn out your $20 driver!

"Pot modding" a violet laser involves adjusting the current according to the driver's instructions; it just adjusts the current. You should consult the instruction manuals for your specific driver before you attempt to mod them. Also, be warned that some laser diodes will not even lase if the current is too low. If I recall, the old PS3 laser diodes were much better for low-powered "laser pointer" blu-ray lasers, but some like the PHR-803Ts start with a higher power to begin with.
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Old 03-26-2009, 06:33 AM #9
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Default Re: Changing LD on a Romisen laser

Bionic-Badger

Okay.. Anyone knows what the minimum output on a PHR-803T diode is?

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