White Laser Pointer - Need Info/Help

Another thing your going to run into is focus. There's what is known as chromatic focus. specific wavelengths focus at different lengths. You will get one beam to be focused on 20 feet and set the other at that distance and then the third and at 25 feel your beam is going to be way outta focus because of that. Look it up. I lost the picture that showed this.

yeah.. my first real step is to maintain the perfect beam... Ideally my goal is to maintain the perfect white beam to infinite.
I've had a long discussion with my friend who works for the optical industry and said that he would have to individually test each laser to correctly get the perfect beam diameter for each diode. I'll be seeing him this weekend to see if it possible for him to find the correct lenses for each diode.

He said the alignment of the lasers to maintain the beam isn't much of an issue if they can be adjusted, which I plan to do because over time they will move out of alignment.

I haven't perfected my driver for him to test each one prior to the tests so I'm using a spare rckstr driver to drive each diode.
As far as drivers go I have been thinking of having a small capacitor and a few resistors to help maintain a steady output for the lasers.

If all goes well after my friend finds the perfect lenses for each the appoximate diameter of the pointer host will be 18mm.. as far as lengths go I will have to determine the power consumtion as well optic setup.

I may even sell it after perfecting it ;D How many ppl do you think will be interested in a white hand held pointer... IF I get it perfected (warning: may take months)

does your friend have an 405nm coated lenses that will fit in an aixis module?

well it matters the price

Its a bit pricey but it will do the job http://www.laserpointerforums.com/forums/YaBB.pl?num=1225140546

ben74 said:

Its a bit pricey but it will do the job http://www.laserpointerforums.com/forums/YaBB.pl?num=1225140546

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too large of a block. I'm aiming for small and as compact as possible, and I've got someone already who is going to custom cut everything for me. The costs varry, but I wont know anything definite until next week.

As for the chromatic focus , what you could do is adjust each laser's beam diameter at the aperture to be the same, then with a second lens , adjust the divergence.You would need additional optics, but same initial diameter and same divergence = perfect focus at whatever distance.

Mkay, I just spoke with my friend who is helping me out with the optics. After the measurements that were taken and to have each beam be perfect would require many different lenses to full control the beam to be exact to the next. He estimated that it would take appx 2 for the green diode, two for the red, three for the violet, and 4 to have them all come together with a focusable lense.

All lenses would have to be custom cut and some laser cut... so it would end up costing appx $1-$2k and appx. 3-5 months for a build like this (includes work and day to day living stuff) to make it perfect with the custom host, alignment correction, custom drivers.

In theory it sounds great and is very possible.. in cost, time, and end result... just isn't enough for me to justify this build anymore.

I just don't have the time to do so much of this by myself because the trail and error part on the alignment will make me want to shoot myself and prob go blind in the process even with with the proper protective eye wear on.. lol

what if all three lasers were set to focus infinity before they enter any optics. isn't that how it is done with RGB scanners?

I know there was another thread that covered 7 colour lasers, as I couldn't find it I thought I would try adding this here

I am working toward a neat handheld version, I got the optics together today and took some photo's... it looks better to the eye than it does with the camera but I am aware I need to adjust colour intensities.

I will post a tutorial once all my parts arrive and are assembled.... this may be delayed due to Christmas post though.

Regards rog8811

Stop teasing! [smiley=thumbup.gif]

rog8811 said:

I know there was another thread that covered 7 colour lasers, as I couldn't find it I thought I would try adding this here

I am working toward a neat handheld version, I got the optics together today and took some photo's... it looks better to the eye than it does with the camera but I am aware I need to adjust colour intensities.

I will post a tutorial once all my parts arrive and are assembled.... this may be delayed due to Christmas post though.

Regards rog8811

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Wow...

That is amazing!

I cant watch the video :-/

Like any kid with a new toy I cannot wait to show this off, I will start posting the tutorial today.

That should give others, who want to try it, the chance of doing it during the christmas holidays.

Regards rog8811

AoiShikaku said:

[quote author=MarioMaster link=1225081589/0#1 date=1225084064]i think there was someone on photon-lexicon a while back who made a "white" pointer with a red diode, a green module, and a violet diode, but cramming the optics in a portable made the quality fairly poor and the colors seperated after only a few feet - but it was a good bit of "proof of concept"

for lasershow scanners if you have 650nm red and 473nm for blue, the ratio is 1:2:4 for green blue and red, you'll probably need more violet than 473nm since 405nm is pretty close to the edge of the visible spectrum

for parts you're gonna be needing of course the 3 colors of lasers, as well as either dichros or some kind of glass components to combine the beams

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Awesome... helps me go through some of the pre-troubleshooting that will occur.
I have a friend who works in the optical industry and is willing to help me out with some glass cutting so there is no worry on that, but after your post I think I would use multiple adjustable mirrors/glasses to get the beams to be perfect from as far of a distance I can go.

So for the ratio of 1:2:4 for G-B-R, would that be changed if I were to use a 405nm instead of the 473nm?  


well now I know what will be the hardest thing will be...  alignment.

Aoi[/quote]
405nm likely won't work, its not really blue. You would need around 500nm for a nice blue.

500nm is a blueish green.

With 405nm you can use fluorescence by a common white paper to get a nice blue.