Beam and divergence question

[Song]

Dear Senior,
How can I make a RGB projector with 4mm beam with a divergence of 1mrad?
The power is between 3-5W.

[LaNeK779]

well, to keep it simple, the total beam diameter and divergence of a projector depends upon the individual specs of the lasers used
so, the "worst" module in terms of beam diameter and divergence affects (or sets) the total divergence of the whole projector's beam

4mm is not difficult, most greens are almost half this, and you can get 4mm with 445 and reds
it is the 1mrad that looks optimistic to me, as most greens are higher than that and the 445 marginally cover this

if you could give us details of the moduls you want to use, maybe we could go into more detail on this

[Song]

well, to keep it simple, the total beam diameter and divergence of a projector depends upon the individual specs of the lasers used
so, the "worst" module in terms of beam diameter and divergence affects (or sets) the total divergence of the whole projector's beam

4mm is not difficult, most greens are almost half this, and you can get 4mm with 445 and reds
it is the 1mrad that looks optimistic to me, as most greens are higher than that and the 445 marginally cover this

if you could give us details of the moduls you want to use, maybe we could go into more detail on this

Can I make it with these:
640nm 1W+445nm 1W+532nm 1W? all from CNI.

[andy_con]

a simple anwser would be to buy modules from any of these as they all have good beam specs -

rgblasers
kvant
arcots
opsl

[taggalucci]

Can I make it with these:
640nm 1W+445nm 1W+532nm 1W? all from CNI.

I suggest you look at CNI's website for the beam specs for each of the lasers you desire. This should provide you with the information you need.

[Song]

a simple anwser would be to buy modules from any of these as they all have good beam specs -

rgblasers
kvant
arcots
opsl

that's beyond my ability....

[LaNeK779]

640nm 1W+445nm 1W+532nm 1W? all from CNI.

445 = beam diam 5mm, beam div 1.5mrad http://www.cnilaser.com/PDF/MDL-III-447.pdf
640 = beam diam 3.5mm, beam div 1.5mrad (not sure which model, let's assume this one http://www.cnilaser.com/PDF/MRL-N-640.pdf)
532 = beam diam 3mm, beam div 2mrad http://www.cnilaser.com/PDF/MGL-H-532.pdf

you could try to expand the green beam by a factor of 1.4 using a couple of lenses (search for "telescopics") That should give you a beam of 4.2mm with a 1.43mrad divergence
then you could mask the blue beam just a bit to make it 4.2mm in diameter

the red will be the thinest beam of all, but that is not bad at all for visibility. At least all your beams will have similar divergence

[Song]

I suggest you look at CNI's website for the beam specs for each of the lasers you desire. This should provide you with the information you need.

It seems a little confuse to me.
But thank you anyway.

[Song]

445 = beam diam 5mm, beam div 1.5mrad http://www.cnilaser.com/PDF/MDL-III-447.pdf
640 = beam diam 3.5mm, beam div 1.5mrad (not sure which model, let's assume this one http://www.cnilaser.com/PDF/MRL-N-640.pdf)
532 = beam diam 3mm, beam div 2mrad http://www.cnilaser.com/PDF/MGL-H-532.pdf

you could try to expand the green beam by a factor of 1.4 using a couple of lenses (search for "telescopics") That should give you a beam of 4.2mm with a 1.43mrad divergence
then you could mask the blue beam just a bit to make it 4.2mm in diameter

the red will be the thinest beam of all, but that is not bad at all for visibility. At least all your beams will have similar divergence

Thank you for your help.
I will try and see what I can do.

[andy_con]

that's beyond my ability....

indeed and thats the problem with lasers everyone wants RGB modules with 1mm beams @ 0.5mR for only a £1, no one wants to pay for a decnt module.

if you want the best your going to have to pay for it