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



Laser Pointer Store

Combining 2 NUBM44 for portable 14W

Joined
Jul 3, 2007
Messages
42
Likes
6
Points
0
Alright, I do not mean to be spoon fed info. Ive been looking hard but I cant find the info I need. I am curious of what I would need for this project. I know I need a PBS cube but I am not exactly sure of what kind I would need. Also it here any other optics needed besides the PBS. I am also curious if there is practical way to focus the combined beams like you would normally with 3 element lens or g2 lens?
 

RedCowboy

Well-known member
LPF Site Supporter
Joined
Jul 10, 2015
Messages
6,830
Likes
1,652
Points
113
The lasers have to be heat sinked, you would need G2 lens and a cylindrical pair for each to correct the divergence of the fast axis then a bounce mirror, a wave plate and a combine cube or pass/reflect glass at a 45 angle, maybe finish off with a nice beam expander.

Use the search bar, you can find the info.
 
Joined
Feb 12, 2016
Messages
314
Likes
132
Points
43
Oh, Hi Red, you were as always faster in reply than me!

Hi midnightchime,

If you do not want to be spoon fed, just look at my non portable device in last reply to Red´s thread in Optics section - there you will see how it all has to be assembled.

About portable: I have been trying to assemble such a thing (for 2 NUBM07, but this could also work with 44´s) since year start, but every heatsink I orderd from ebay and aliexpress turned out to be not what was advertised on pictures or simply not passing to 12mm copper modules.
So finally, I decided to make heatsinks from 12 mm shaft holders (you see one on the picture).

Here is the assembled but not yet tested optomechanics part with 3 cyl. lenses acc. to finding of Milos in his Optics thread. The bag contains prism mirror. PBS cube and waveplate are not on the picture, because I do not want to scratch them before glueing on. I also want to test these 3 step-down circuits from dx to drive 2 NUBM07 in series at 3.5A. For 44´s you will need SXD drivers instead.



To make a thing like this the parts except of Al shafts from hardware shops will be:

2x 12mm copper modules from DTR (short Al rods are their placeholders on the picture) with SXD drivers and G-2 lenses.
4x 12mm shaft holders from aliexpress cut to obtain heatsinks with optical axis hight of 15mm and well filed to ensure heat transfer to the baseplate.
2x PBS/mirror holders from Lasertack. They are designed for optical axis at 15mm hight.
1x dielectric coated Prism mirror from Lasertack (or flat mirror from elswhere).
1x 445nm waverotator (this is how they call waveplate in Poland) from Optlasers with brass mount. This set is not in their ebay shop, but I asked by mail and they sent it together for the price of 638nm set.
2x sets of 3x Cylindrical lenses also from Optlasers. They are for 638nm, but work well with blue because of broadband AR coating. Unfortunately they do not sell separate concave lenses, so I have to sacrifice 2 sets. The reason for such orientation of 3 lenses is to build a variable 1D beam expander - you can find explanation in Milos thread, Optics section. These lenses have 12mm square shape and you can see pass well into the 12mm Al U-shaft.
1x 400-450nm PBS (I checked several from lasertack, stanwax, aliexpress and techhood-the cheapest one - they all work well).

Last thing - do not expect 14W exactly. With the tested non portable device I only got 12-13W for combined beam while only one laser on at a time of mesuring and my LPM sensor has burned pitches after this because it was at its limit.
 

Attachments

Joined
Jul 3, 2007
Messages
42
Likes
6
Points
0
thank you for your input. This is not going to be as simple as I thought. Im not sure if I should go forward with doing it only to stall in the middle of the project or do a poor job due to lack of tools. Or perhaps I am just being intimidated by concepts that I d not fully understand. You see I have been building lasers for 4 years now but never moved on from just your basic single diode. I thought it would be a fun project to combine 2 beams. I have only ever made lasers that are held together with electric tape and hot glue lol
 

Attachments

CDBEAM777

Well-known member
Joined
Feb 25, 2010
Messages
1,073
Likes
469
Points
83
thank you for your input. This is not going to be as simple as I thought. Im not sure if I should go forward with doing it only to stall in the middle of the project or do a poor job due to lack of tools. Or perhaps I am just being intimidated by concepts that I d not fully understand. You see I have been building lasers for 4 years now but never moved on from just your basic single diode. I thought it would be a fun project to combine 2 beams. I have only ever made lasers that are held together with electric tape and hot glue lol
NO....It is not simple !! Optics are a demanding Master !! But worth it !!! Perhaps I will undertake another build....which shall combine two (2) HP blue diodes. I have several builds to finish still !!! Beam out !!
 
Joined
Feb 12, 2016
Messages
314
Likes
132
Points
43
Hi CDBEAM,

On you beautuful builds in different colours there was a pair of big square cylindrical lenses (6x if I am correct).
Do you know a source of those where price woulds be resonable?
What size are they?

Thank you.
 

CDBEAM777

Well-known member
Joined
Feb 25, 2010
Messages
1,073
Likes
469
Points
83
Hi CDBEAM,

On you beautuful builds in different colours there was a pair of big square cylindrical lenses (6x if I am correct).
Do you know a source of those where price woulds be resonable?
What size are they?

Thank you.
6X at 18mm wide by 23mm tall. PM me :eg:
CDBEAM=======>
 




Top