Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers



Using 638nm and 520nm to make a yellow combined laser

SuckPit

New member
Joined
Dec 23, 2019
Messages
26
Points
3
Just had a quick question. I'm planning to try and put together a yellow laser by combing 638nm and 520nm and I wanted to know what a good blend would be for a "perfect" yellow. I'm looking to get around 50-100mw combined power. What do you think would be a good ratio for it?
 



Lumenati

New member
Joined
Feb 26, 2020
Messages
2
Points
3
Firstly, I'd recommend using 532nm for the green, as the color ends up being much closer to that of a true 589/593nm (I've built both, with 520nm + 638nm the color is yellow, but looks 'washed out' as 520nm veers on the 'blue' side of the spectrum). Regardless of which wavelength you choose, I'd say for 100mw, 70-80mw red + 20-30mw green would make a good ratio; and for 50mw, 35-40mw red + 10-15mw green (best to use drivers with pots too, for adjustments).
 

SuckPit

New member
Joined
Dec 23, 2019
Messages
26
Points
3
Cool thanks! My only problem is most 532nm are dpss and have much small beams than 638nm. That's why I was thinking about using a 520nm for slightly bigger beam size to go with the 638nm. I'll probably try out both 532nm and 520nm and see how big the difference is. Thanks again!
 

Encap

Well-known member
Joined
May 14, 2011
Messages
5,559
Points
113
Unless you want to make a hand held which would be very difficult and expensive if you have the skills to make one, you might want to look at RGB modules on eBay which are low cost $50 to $80 depending--
Use the R and G don't turn on the blue. There are several available some with 532nm and some with 520nm.
See: https://www.ebay.com/sch/i.html?_fr...ule.TRS1&_nkw=RGB+white+laser+module&_sacat=0

Hope you realize it is not possible to make a yellow wavelength laser by combining red and green laser beams.
All you will have is an illusion of some sort, depending upon your visual system, of yellow at best if both lasers are perfectly aligned and both lasers have same beam shape and size which is still just a red and green laser laser beam not a yellow laser.
Color is not a physical property; it is merely the brain’s interpretation of different wavelengths of light. Color names are words/symbols for that brain activity.
 
Last edited:

hakzaw1

Well-known member
Joined
Apr 2, 2009
Messages
10,208
Points
113
WHAT HE SAID^^^^
I have both and a true yellow HeNe looks so much better and has no duty/rest cycling
those 'white' lasers are a good deal-many to choose from-and there are kits too.
BTW 'yellow' (and 'orange')_HeNes are very spendy and some like mine only makr 6 or 7 mW BUT WOW
-

they-make a much better yellow LUMIA--with a combined yellow the glass seperates much of the red and green. just like a diffraction grating-surface of a dvd.cd disk etc--I prolly paid too much BUT buying an olde school yellow from Dr Sam (THE laserman)
made it a better deal--IIRC $300 for tube only-no PS came with--I had Sam put his autograph on the laser. IF you do not know who SAM is---but Sam and friends have most everything you may need to know on-line FREE and no ads etc however PLEASE do not contact Sam if you have NOT really tried to find help via google and our search LPF.
during my time at LPF I would say MYB 3 or 4 (out of thousands) questions asked here should be sent to Sam-- the rest---asked/answered a bunch of times.



btw when we get help from Sam be sure to say TY and mention the forum--Sam reads it all

hak
 
Last edited:

SuckPit

New member
Joined
Dec 23, 2019
Messages
26
Points
3
I got a RGB module from techhood it works okayish, the pwm on it is rather meh. I want to try and make RG analogue one for the challenge. I had a Spartan 30mw 589nm from DL for a while but sold it a while back since I was moving around a lot and didn't want it to get broken. I've been browsing these forums for about 5-6 years now, but only recently made a account.

One more quesiton does anyone know of some small analogue drivers that I can attach a 10k Pot on for external control? It seems the BlackBuck 8M are all sold out and not being made anymore. Even asked Barnett but he said he was also out of them.

I don't know if you saw it or not but I also did say thanks in my original reply. You don't really need to tell me to do something when I already did it.
 
Last edited:

SuckPit

New member
Joined
Dec 23, 2019
Messages
26
Points
3
Yep, I've already search the forums, the main ones that had info for me was Jayrobs Mag and his pointer. But I figured I might ask now since those were years ago. I was even thinking of using a PHR sled (kinda like the white fusion builds) to make it but it seems there isn't anyone that sells them.
 

Encap

Well-known member
Joined
May 14, 2011
Messages
5,559
Points
113
Last edited:

hakzaw1

Well-known member
Joined
Apr 2, 2009
Messages
10,208
Points
113
these help me a lot..ac1ecd_1be9ef19f2cb4345982766c9f35799d2_mv2.jpg

another view is needed-the 'other' pins are wire-solder friendly --not round but "U" shaped so a tinned wire slips in and you finish with a quick touch of your iron--so if a diode fails you can unplug the bad and push in a new diode.
these are better for 5.6mm diodes.

aixiz.com/accessories
 




Top