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Old 12-03-2013, 06:10 PM #1
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Unhappy 2W 638nm beam size

Greetings,
I have a 6W RGB with DT40W with 2W 532, 2W 638 and 2W 450nm from goldenstar. The problem is of course the beam size of the red and blue, they are very thick and as you know ( i did not, when i bought it) the dt40w has small mirrors, for 3mm beams.

The output of the diodes, tested in front of the diodes are: red-1.8w, green-1.8 and blue 1.45 ( way underspec) .
I need to find a solution to keep the dt40w ( which is great) and maybe make the red and blue beams thinner. The red is made out of 4 diodes, and it only measures 500mW maximum after the scanner, the blue also is about 500mW after the scanner.

I searched the forums and did not find anything helpfull, maybe someone has an ideea.

Thank you very much!


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Old 12-04-2013, 12:44 AM #2
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Default Re: 2W 638nm beam size

You could sell the scanners you have now and use scanners with larger mirrors. DT has scanners like this if you prefer DT. This is an ideal solution since it is simple, but your scanning speed will suffer a bit. 30kpps perhaps.

You can use a telescope to shrink the beam. But this requires a knowledge of optics above that of "novice." (edit: Since this confused someone else, I will clarity: I'm not implying you are a novice - I have no idea what your skills are). You may also need machining and other engineering skills. Power will decrease slightly, and divergence becomes much worse.

You could replace the collimating lens in front of the diodes. This will have the same effect as the telescope: optical work/engineering/machining still applies, but power loss is less.
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Old 12-05-2013, 01:44 PM #3
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Default Re: 2W 638nm beam size

Replacing the scanners also seemed to me as the easiest thing to do, as I am not very experienced with lasers.
I don't really care for scanning speed, what i was interested was the scanning angle, are there any other similar scanners like the dt40w? I measured the beams, the 638 is 7mm and the blue is 5mm.

I would also be interested in sending the diode or laser to someone who knows how to replace the collimating lens, if anyone is interested, I will pay for the service, of course.

Thank you!
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Old 12-05-2013, 02:25 PM #4
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Default Re: 2W 638nm beam size

Inside the projector.


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Old 12-08-2013, 09:00 AM #5
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Default Re: 2W 638nm beam size

Does anyone have any othe advice?
I'm interested in selling the dt40w scanner for 500usd+shipping and paypal fees or in exchange with another scannere with bigger mirrors.
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Old 12-09-2013, 07:55 AM #6
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Default Re: 2W 638nm beam size

I was thinking about the DT20-H, which has bigger mirrors, or the PT-40K, which do you think its better?
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Old 12-09-2013, 03:45 PM #7
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Default Re: 2W 638nm beam size

I'm not up to date with all the new scanner options. I only know what google finds for me in 30 seconds but it looks like the DT20-H is for 7mm aperture. You only need a 5mm aperture, don't you? The PT-40k 6mm mirrors would have an aperture something like 3.5mm so it's bigger but probably not big enough.

DT40s are available with larger mirrors, but the scan speed goes down to 30k. I do not think they are also available with a wide option, however.
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Old 12-09-2013, 05:01 PM #8
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Default Re: 2W 638nm beam size

Well my beams are 7mm red and 5mm blue, doesn't that mean that i need mirrors of 7mm? Or maybe i dont understand quite right...
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Old 12-09-2013, 07:38 PM #9
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Default Re: 2W 638nm beam size

Yes, you'll want mirrors of 7mm to fit the largest beam.
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Old 12-09-2013, 09:38 PM #10
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Default Re: 2W 638nm beam size

^Except the mirror is at a 45 degree angle to the beam +/- a few degrees, so you need a bit more than 7mm to fit all of it. 10mm at least I would think, but I don't feel like doing the trig right now.

Myself, I would take the loss on the red and get a 5mm aperture (7mm mirrors?), but it is certainly up to you.
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Old 12-09-2013, 11:56 PM #11
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Default Re: 2W 638nm beam size

Yeah, i am aware that i will loose some of the power.
So my options are, the PT-40K or the DT-20H
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