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Old 10-07-2007, 12:10 PM #17
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Default Re: how to make a 405nm blu-ray laser

now you will need to focus the laser, screw the lens all the way back into the housing
(if the laser has a focal point then you will have to unscrew the lens and take the spring out from behind it)
with the lens all the way in the beam should start out small and spread pretty quickly.
unscrew the lens a little bit and turn it on again, it should be the same as above but it has a lower divergence.
keep turning it on then undoing the lens a bit until the dot is quite small at a distance (if the beam focuses to a point then diverges you have turned it too far, screw it back in a bit)

you can either leave the laser like this or you can do the following step and try to get a really low divergence.

find somewhere that you can sit the laser somewhere and hang up a peice of paper about 20 or more meters away from it.
i used the neighbors tennis court i put a stool in one end and a peice of paper on the fence at the other end.
now get someone to stand near the paper as you shine the laser on it (put it in bluetack or something to keep it steady)
and slowly adjust the lens and get them to tell you wether it is getting bigger or smaller if it is getting bigger then turn it the opposite way and if it is getting smaller then keep turning (do this at night so the dot is easier to see).
by doing this i managed to get a divergence of 0.1mrad! i think its worth it 8-) .

heres a picture of the paper with the laser shining on it at 34 meters away.
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Old 10-07-2007, 12:11 PM #18
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Default Re: how to make a 405nm blu-ray laser

heres a closeup of the dot with a ruler next to it (the dot is smaller than it appears in the picture)
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Old 10-07-2007, 12:12 PM #19
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Default Re: how to make a 405nm blu-ray laser

now you (hopefully) have a blueray laser. you can buy a spiffy case from wicked and power it on 2 cr123as if you want to.
currently mine is being held together with duct tape ;D its just the housing taped to the battery pack ;D but i do plan on buying a case from wicked once i get some money 8-) .
heres another picture of the laser.
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Old 10-07-2007, 12:13 PM #20
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Default Re: how to make a 405nm blu-ray laser

and now, what you have all been waiting for BEAMSHOTS .
these are pictures of my blueray, a 200mw 660nm and a 125mw Dragonlaser in a smoky room enjoy .
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Old 10-07-2007, 12:14 PM #21
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Default Re: how to make a 405nm blu-ray laser

more beamshots...................
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Old 10-07-2007, 12:15 PM #22
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Default Re: how to make a 405nm blu-ray laser

mooooooooorrrrrreeeee
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Old 10-07-2007, 12:16 PM #23
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Default Re: how to make a 405nm blu-ray laser

..........................................
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Old 10-07-2007, 12:16 PM #24
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Default Re: how to make a 405nm blu-ray laser

.................................................. .!!!!
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Old 10-07-2007, 12:17 PM #25
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Default Re: how to make a 405nm blu-ray laser

mmmmmhhmmmmmmmm
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Old 10-07-2007, 12:18 PM #26
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Default Re: how to make a 405nm blu-ray laser

and heres my attempt at making a white dot
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Old 10-07-2007, 12:20 PM #27
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Default Re: how to make a 405nm blu-ray laser

this one was 405nm violet mixed with 660nm red, its a really pretty color in real life.
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Old 10-07-2007, 12:21 PM #28
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Default Re: how to make a 405nm blu-ray laser

heres me taking a shot at turquoise with 405nm violet and 532nm green.
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Old 10-07-2007, 12:25 PM #29
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Default Re: how to make a 405nm blu-ray laser

heres a picture of the dots at around 10m, the green is very close to running out of batteries, thats why it isnt dominating the picture ;D.
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Old 10-07-2007, 06:57 PM #30
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Default Re: how to make a 405nm blu-ray laser

Thanks for taking the time to post this aaron, very informative, I know I will be consulting this thread when the sleds come .

Regards rog8811

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Old 10-07-2007, 08:04 PM #31
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Default Re: how to make a 405nm blu-ray laser

Awesome guide, thanks a lot m8!
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Old 10-07-2007, 08:13 PM #32
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Default Re: how to make a 405nm blu-ray laser

Very well done, man ! {Two thumbs up !}
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