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Old 06-07-2012, 04:03 AM #1
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Default WTB Adjustable power laser

I wonder if it's so hard to make adjustable power lasers?

Actually I am looking to buy 405nm's adjustable power laser, but I don't think I have seen any so far? but i thought it's possible to adjust the power on the driver? Or it's easier for the laser to die this way?


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Old 06-07-2012, 05:22 AM #2
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Default Re: WTB Adjustable power laser

Someone just asked a similar question, check here: WTB : mini low powered 445 with variable power
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Old 06-07-2012, 05:24 AM #3
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Default Re: WTB Adjustable power laser

basicially the answer is you use a multi mode driver from a flashlight. DealExtreme has a lot of these. they have modes such as high/med/low/strobe etc

they are usually PWM moderated.
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Old 06-07-2012, 05:47 AM #4
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Smile Re: WTB Adjustable power laser

Quote:
Originally Posted by ARGLaser View Post
Someone just asked a similar question, check here: WTB : mini low powered 445 with variable power
Thanks, but I don't mean high/low/strobe, but multi-steps adjustable,
but high/low/stroke is nice too


Quote:
Originally Posted by ReaperZ View Post
basicially the answer is you use a multi mode driver from a flashlight. DealExtreme has a lot of these. they have modes such as high/med/low/strobe etc

they are usually PWM moderated.
I have asked before, but they said it's not suitable for 405, as the multi mode form flash light is easier to burn the 405, the reason why it can be use on a 445 is because the diode is different.
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Old 06-07-2012, 01:26 PM #5
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Default Re: WTB Adjustable power laser

It's possible. Easier in a lab-style host than a torch body though.

You could so it simply with a linear driver and variable resistor set up so as not to exceed the diodes rating- you would need lots of volts and heatsinking for this though.

The simplest way would be with a step up voltage driver and a gutsy variable resistor. Again with either bias resistors or some other method of preventing overdriving the diode.
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Old 06-07-2012, 01:35 PM #6
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Default Re: WTB Adjustable power laser

What size laser are you looking for?
With somthing like this, the larger the laser the easier it is going to be to make.

I have built an adjustable 445 in a D maglite,
It had a twistable potentiometer sticking out over the power button.
I could adjust it anywhere from about 0.1W to a full 1W
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Old 06-08-2012, 06:05 AM #7
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Default Re: WTB Adjustable power laser

Quote:
Originally Posted by AUS View Post
It's possible. Easier in a lab-style host than a torch body though.

You could so it simply with a linear driver and variable resistor set up so as not to exceed the diodes rating- you would need lots of volts and heatsinking for this though.

The simplest way would be with a step up voltage driver and a gutsy variable resistor. Again with either bias resistors or some other method of preventing overdriving the diode.

Quote:
Originally Posted by justinjja View Post
What size laser are you looking for?
With somthing like this, the larger the laser the easier it is going to be to make.

I have built an adjustable 445 in a D maglite,
It had a twistable potentiometer sticking out over the power button.
I could adjust it anywhere from about 0.1W to a full 1W

Actually if possible, I would want pointer size, the D Mag lite seems a bit big... I have seen flash light uses 18650 battery with two button to adjust the brightness... But it's correct that 405 diode is much easier to burn compare to 445?
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Old 06-08-2012, 06:11 AM #8
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Default Re: WTB Adjustable power laser

Quote:
Originally Posted by SOG View Post
I have seen flash light uses 18650 battery with two button to adjust the brightness
Got a link to that flashlight? it would probably be possible to make into a laser
Quote:
Originally Posted by SOG View Post
But it's correct that 405 diode is much easier to burn compare to 445?
Some times not always, for long range burning an sj06 405 will beat a 445,
But upclose, a good 445 will smoke a 405

EDIT:
it would be a good idea to post what you are willing to spend on it
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Old 06-08-2012, 09:40 AM #9
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Default Re: WTB Adjustable power laser

I'm sure you could find the right sized variable resistor to fit in whatever you were after. It may take some creativity and even some metal machining to make everything fit but definitely possible
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532nm 315mW Lab laser
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660nm 120mW Energizer AAA MacGuyver build
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Old 06-09-2012, 11:56 PM #10
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Default Re: WTB Adjustable power laser

Thanks, Let me look for that flash light, I seen it a while ago, it's with two button near the neck of the light.

About budget, I really have no idea, maybe about 300-400? 405 is still around 500mw for a safe long life output, correct?

The reason I want is, is because I would like to keep it low power for fluorescent, but some seems to take a little more power... so I would like adjustable, and once a while I would burn something, and then I will turn it high up.
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Old 06-11-2012, 03:53 AM #11
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Default Re: WTB Adjustable power laser

we can offer adjustable power supply, so you may use it for a laser

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