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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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MY LASER COLLECTION:
3.6 Watt RGB
1657mW 532nm Lab
10 one Watt 445nm
10W 808nm Fiber system (anyone want to swop for small Green Argon?)
1183mW 650nm
1800mW Watt 445nm (2x900mW through PBS)
510mW 532nm
500mw 635nm (DEAD Apr 2011)
259mw 660nm
2 Watt 808nm
205mw 404nm
YAG 2J Pulse (Still need a PSU)
Countless laser diodes.
Lots of 5-10mw green lasers
3mw He-Ne (My first laser. 1995)
20 high power c-mounts

Last edited by blrock; 03-26-2011 at 04:00 PM.
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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..
Attached Thumbnails
3W 445 + 1W 532=white WHY?-dsc_0533.jpg  
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MY LASER COLLECTION:
3.6 Watt RGB
1657mW 532nm Lab
10 one Watt 445nm
10W 808nm Fiber system (anyone want to swop for small Green Argon?)
1183mW 650nm
1800mW Watt 445nm (2x900mW through PBS)
510mW 532nm
500mw 635nm (DEAD Apr 2011)
259mw 660nm
2 Watt 808nm
205mw 404nm
YAG 2J Pulse (Still need a PSU)
Countless laser diodes.
Lots of 5-10mw green lasers
3mw He-Ne (My first laser. 1995)
20 high power c-mounts

Last edited by blrock; 03-26-2011 at 06:06 PM.
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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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