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Old 03-25-2011, 06:25 AM   #1
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Default 3W 445 + 1W 532=white WHY?

This past weekend I combined my blue laser and fine tuned my "laser system". To my astonishment the beam appeared pure white. I never even added any of my 635nm red.
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Old 03-25-2011, 06:27 AM   #2
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Default Re: 3W 445 + 1W 532=white WHY?

Do you know how amazing a picture of that would be?
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Old 03-25-2011, 07:13 AM   #3
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Default Re: 3W 445 + 1W 532=white WHY?

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Originally Posted by danefex View Post
Do you know how amazing a picture of that would be?
I'll take some pictures this weekend and post them....
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Old 03-25-2011, 07:31 AM   #4
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Default Re: 3W 445 + 1W 532=white WHY?

Sweet! Pictures of tight white beams always have impressed m..... ahhhh that doesn't sound right now does it?
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Old 03-25-2011, 09:10 AM   #5
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Default Re: 3W 445 + 1W 532=white WHY?

Yep lets see it
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Old 03-25-2011, 09:27 AM   #6
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Default Re: 3W 445 + 1W 532=white WHY?

I'd say what you got from 445nm plus 532nm is CYAN.
In order to get WHITE, you'd need some red (650 or 635nm) in there as well.

Maybe it looked white to you because it was simply so very bright.

Want to see pictures too, even though they are hard to make and often betray the real colors you see in person.
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Old 03-25-2011, 10:03 AM   #7
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Default Re: 3W 445 + 1W 532=white WHY?

Can't wait for pics
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Old 03-25-2011, 01:15 PM   #8
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Default Re: 3W 445 + 1W 532=white WHY?

Anecdotally, whenever I've showed Blue + Green to non laser (or non-sciency) people, the comment about their combined dots (low-tech, just aiming the dots together) is always "ohhhhh, look, white!"

Don't forget, 532nm is slightly to the *right* of the tip of the CIE curve "hump". Wow this answer has poor scientific terminology ;p But if you were to draw a straight line between 532 and 445 of the the following curve, it definitely takes you pretty close the the inner "white" territory, as opposed to hugging the curve itself:

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Old 03-25-2011, 02:09 PM   #9
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Default Re: 3W 445 + 1W 532=white WHY?

Your eyes have an automatic white balance. If you sit in a green light for long enough, and it starts to appear white. You're not seeing white. Compare it with a light bulb and you'll see what I mean.
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Old 03-25-2011, 11:59 PM   #10
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Default Re: 3W 445 + 1W 532=white WHY?

Are looking at the combined spot without safety glasses?? If you are, your eyes are just being oversaturated and protecting themselves by giving you the impression that you are seeing "white". You are looking at laser with a total of 4W.

Be careful, you may be damaging your eyes.

Take care of them.

Quote:
Originally Posted by blrock View Post
This past weekend I combined my blue laser and fine tuned my "laser system". To my astonishment the beam appeared pure white. I never even added any of my 635nm red.
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Old 03-26-2011, 12:13 AM   #11
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Default Re: 3W 445 + 1W 532=white WHY?

It could also be due to florescence effect of both wavelengths , particularly 445nm.
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Old 03-26-2011, 01:06 AM   #12
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Default Re: 3W 445 + 1W 532=white WHY?

Fluorescense does not affect the color of the beam though, just that of the dot. Its like shining a bluray laser onto white paper - you get a purple beam and a brilliant bluish-white spot.

Color adaptation in the eye is a feasible explanation though, especially if you were working with little ambient light. Your eyes only get the light from the lasers and make a color construction based on that information. There would be green and blue for the separate beams, but combined they could look white.

As similar thing happens when you spend a long period of time under those orange sodium lights: The world appears black and white, while the amount of light is great enough to allow color vision... just because its monochromatic your eyes will assume its white for you.
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Old 03-26-2011, 03:56 PM   #13
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Default Re: 3W 445 + 1W 532=white WHY?

First of all apologies to everyone...You were all right. I think hours of alignment last weekend made me see white. I did wear googles but I carelessly took it off at times.

I used some smoke and took a few pictures for the first time. My laser system is almost complete...after so many months of building and alignment complications. Just have to drill new holes for the galvos as I'm a few mm off my x-axis. The cyan beam is SO bright...

PS: the fans from the A130/A140 projector works well to keep the 445 heatsink cool. They high power fans...
Attached Thumbnails
3W 445 + 1W 532=white WHY?-dsc_0501.jpg   3W 445 + 1W 532=white WHY?-dsc_0502.jpg   3W 445 + 1W 532=white WHY?-dsc_0513.jpg   3W 445 + 1W 532=white WHY?-dsc_0519.jpg   3W 445 + 1W 532=white WHY?-dsc_0524.jpg  

3W 445 + 1W 532=white WHY?-dsc_0528.jpg  
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Old 03-26-2011, 04:06 PM   #14
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Default Re: 3W 445 + 1W 532=white WHY?

Now that is amazing! I see what you mean in the 3rd pic about how close it does comes to solid white too, or so it would seem with the intense brightness....
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Old 03-26-2011, 05:57 PM   #15
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Default Re: 3W 445 + 1W 532=white WHY?

Quote:
Originally Posted by danefex View Post
Now that is amazing! I see what you mean in the 3rd pic about how close it does comes to solid white too, or so it would seem with the intense brightness....
Yes it does seem white..
Best part is that I change my palette on the software to get rid of the very common 532 green. I added some blue to get what I think is very close to the Argon 514 green. My favourite laser colour. I've spend the past half hour staring at the green beam.

The picture does not quite do justice for the actual colour...but it's not far off..
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3W 445 + 1W 532=white WHY?-dsc_0533.jpg  
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Old 03-29-2011, 03:19 AM   #16
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Default Re: 3W 445 + 1W 532=white WHY?

what is that stray green beam going to the left in the 3rd and 4th picture?
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Old 03-29-2011, 03:32 AM   #17
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Default Re: 3W 445 + 1W 532=white WHY?

The dichroic mirrors only reflect 90-something percent of the light. The remainder is either absorbed, or transmitted. You see the transmitted beam.
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Old 03-29-2011, 10:24 AM   #18
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Default Re: 3W 445 + 1W 532=white WHY?

Wow.. that looks pretty good

I see you're combining 2 445's there - what does the spot look like at a distance?
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Old 03-29-2011, 07:00 PM   #19
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Default Re: 3W 445 + 1W 532=white WHY?

Quote:
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Wow.. that looks pretty good

I see you're combining 2 445's there - what does the spot look like at a distance?
It's a +

But you don't really notice it if it's combined into the other lasers.
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Old 03-30-2011, 05:19 AM   #20
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Default Re: 3W 445 + 1W 532=white WHY?

It may not actually be the eye overloading, there is another plausible explanation.

I've observed it with the Arctic and a 250mW greenie before, it's similar, instead of blending to produce a turquoise/cyan, the blend appears to be a very off-white colour.

It can't be overloading of the eyeballs because both the spot and the beam itself appear to be a very bluish white.

It's far from a pure, neutral white, but nonetheless it is 'white' enough to be classified as a cool white.
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Old 04-24-2011, 02:27 AM   #21
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Default Re: 3W 445 + 1W 532=white WHY?

Quote:
Originally Posted by jmgallego View Post
Are looking at the combined spot without safety glasses?? If you are, your eyes are just being oversaturated and protecting themselves by giving you the impression that you are seeing "white". You are looking at laser with a total of 4W.

Be careful, you may be damaging your eyes.

Take care of them.

+rep for that excellant advice- I have heard that about all 405 too. Our eyes apparently do not adjust(un-dialate) like they should and too much, even just off a white wall, can be harmful. I always say if you are seeing a lot of after-images they you need to step away or put on the protection.
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Old 08-12-2012, 04:22 PM   #22
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Default Re: 3W 445 + 1W 532=white WHY?

This looks amazing! I love the cyan color beam. I think Cyan is my favorite color. Currently I'm working on a Yellow beam (Red/Green combined beam) laser. Once I finish with that I will work on the Cyan color. I really like yours! Good job.
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Old 08-12-2012, 04:48 PM   #23
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Default Re: 3W 445 + 1W 532=white WHY?

^^^ the last post in the thread was 16 months ago-

It may have been better to PM the builder to tell him 'good job'.

We look fwd to your new thread when you get your combined lasers done...
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QS/FB3 +Beyond-Mamba Black(clone) 5paghettix2
and I-show x2
KGB1W+ 532 DT Pro 40 soon to be RGB (again)
KGB1W+ 532 DT Pro 40 soon to be GB.
Laserking 1300RGB FULL COLOR 30K(may be FS)
Laserking RGB LK PD2 500 and LK SD 850
REKE RGB 500- G 300
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445nm 180mW-Mini spiro-Yob.
LPMs-RadiantAlpha& Pro 5W-AixiZ SPER/Kenometer-Lite/LB1
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405 100mW ttl mini lab
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Old 08-13-2012, 06:24 AM   #24
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Default Re: 3W 445 + 1W 532=white WHY?

Quote:
Originally Posted by blrock View Post
Yes it does seem white..
Best part is that I change my palette on the software to get rid of the very common 532 green. I added some blue to get what I think is very close to the Argon 514 green. My favourite laser colour. I've spend the past half hour staring at the green beam.

The picture does not quite do justice for the actual colour...but it's not far off..
I love the picture of your dog in the background. I'm a big dog fan.

I also love the 514nm green myself. I think I will play around with blues and greens and see what color combinations I can come up with. I love cyan and the light green of the argons.
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650nm --> 1000mw
632nm --> 1mw HeNe
532nm --> 200mw, 120mw, 50mw
488nm --> 25mw Argon
445nm --> 1000mw

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337nm --> Nitrogen Laser (multiple designs tested)
Various --> Dye Cell (multiple designs tested)
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Old 08-13-2012, 06:32 AM   #25
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Default Re: 3W 445 + 1W 532=white WHY?

I have a question about your build... what mixture of 445nm and 532nm are you using to get your Cyan and light green color? Is the 3W 445nm + 1W 532nm your Cyan build? And how would I modify it for the green? Maybe go 1W 445nm +1W 532nm? Can't wait to start with this one.
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650nm --> 1000mw
632nm --> 1mw HeNe
532nm --> 200mw, 120mw, 50mw
488nm --> 25mw Argon
445nm --> 1000mw

Homemade

337nm --> Nitrogen Laser (multiple designs tested)
Various --> Dye Cell (multiple designs tested)
Rhodamine 6G
Coumarin 460
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