635 or 660 nm??

[deejay_bamse]

What wavelength do YOU recomend för RGB laser??
I have 473nm and 532nm but what RED do You like most of 635 or 660nm??

[guido]

Hi,

biggest Different first: All Chineese Red Laser have bad Beamdata.
Most Times 6mm Beam with 2 or 3mRad Divergence.

632nm is 2.5 Times brighter than 658nm

Most People prefer 658nm because the Colour-Range is growing.
Also 445nm Blue gives you a Brighter "White"

When you decide to 658nm you will not find 658nm with maybe 400mW
für less than 700 Euro when you want a Beam <4mm and Divergence <1.5mRad.

About the needed Power: Hoch much Blue / Green you have this Time ?
Most People use Green:Blue:Red = 1:2:4 Parts

[deejay_bamse]

Now I have 1:2:4...
80mW Blue
150mW Green
And 250mW Red but I have 671nm... So I hardly can see the red laser...
But I will send it to test it so it isnt broken... But is it OK i will try to change it to a lighter red...
And the options is 660 and 635....
But will a 300mW 660nm work fine??

[Dr.Ulli]

I think, you missunderstood something:
1Part Green 532, 2 Parts Blue 473 and 4Parts Red 650!

671nm is near to the border of our ability to see colours...(near 700nm) and the sensitivity of our eyes for it is very low.
I would prefer the 635nm red because its much brighter than the 658nm, but as Guido already said, the colorspace could be a little bit broader with the longer wavelength. (But not much, because the ability of our eyes for differences at red colours is not very extended..look at a rainbow...red looks nearly everywhere as the same colour...)- and 635 is very expensive compared to 658nm.
And also I would prefer the 473nm blue, because the 457nm is much more expensive and also looks a little bit violet. That is because our red-receptor within the eyes can detect also violet. So I think that you will get a much clearer blue with 473nm.
It is wrong to think to have the biggest colour-space with 405nm, because of the reasons explained above.
Thats my opinion!
Greetings!

[guido]

Hi,

basing on your 80mW Blue you should reduce the Green one to max 50mW and use 200-300mW 660nm Red.

But as i said in my first Posting: Compare red with red and red
Would you like to buy a "torch" or a Laser ?
The Red Beam should habe the same or smaller Beam like your Lasers now. And your Blue one ( LasEver ?? ) is about 2mm I think...
When you use a LasEver Red one and scan a white Rectangle you will see
a Big Red Corona...not very nice...

[Dr.Ulli]

Guidos tips are very important and correct!
But think about, if you want to make grafic- or beam-shows!
For the first one (graphics) the divergences of the lasers are very important, of coarse. And it would be better to use the very long wavelength 671nm, BUT for beam-shows the divergence is not so important. I would say furthermore, that for beam shows the bigger divergence is good for safe shows (maximal allowed irradiance) and that for that use the shorter wavelength in red would also improve the safety...you would not need so much power...but more money!
All this depends on the distances, too....and on the density of the fog - for beam-shows.

[deejay_bamse]

Yes I know that my 1:2:4 ratio is a bit wrong.. But I like Green lasers så I wanted the Green to be stronger...
Both the Green and Blue have a 2mm beam and the Red 671 to but I hardly can see the red the other 2...
So the Red are : 1 not an 250mW or 2 671 is a wrong wavelength with that power.....
Do You think 660nm 250mW would be more Ok with the Blue in power?
Or the 635nm 250mW?
Or how much do You think I need in Power to get an 671nm to be good with the Blue?

Most of the time the laser will be used for beamshows... But maby some graphics...

[guido]

I would prefer 658nm, OK i use my own ones

I dont know where to get 635nm with good Beam Data.
Most of them are really XXXXXX.

[deejay_bamse]

Do You think that 660mW will be OK then??

[Dr.Ulli]

Of coarse! Red 650-660 is the best choice if you think on the costs...
I would suggest the red lasers from Guido - the 400mW one.

Or similar ones....with good beam-data for grafics (not so important for beams).

[deejay_bamse]

But what about the power of 660nm?? 250mW??
Or do I have to go upp??
I hope that I can change it with the builder and they have both 660nm and 635nm... They are not DPSS and the price on 635nm is the same as the 671nm.... 660nm much cheaper...

So will the 660nm 250mW be good for my RGB build??

And the beam I have now is 2mm and both 660nm and 635nm is 5x1mm..
If I want 671nm how much power I need then?? Will 400mW be OK for my laser? 671 have much better beam data....

[Dr.Ulli]

You wrote 150mw Green....so it should be 4x150=600mW 650nm!
Guidos red laser 400mW has a divergence of only 1mRad and a smaller beam-diameter than 6mm...!

But this depends on the density of the fog, if you want to look beam-shows - green will be damped much stronger than red....

Another way is to put a 50/50 beam-splitter in front of your green laser - to reduce its power below 80mW, as you have with your blue laser.

Than I think the 250...300mW 650nm will be sufficient to get an acceptable white-balance. But you will notice, that when you modulate the lasers, your white-balance will change, depending on the modulation frequencies and because of other reasons like non-linearity of the laser output.

As you already noticed, the 671nm red is hardly to see...for grafics 400mW would be enough - but I think not for beam-shows- there I would suggest in minimum 600mW....
It is perhaps better to reduce the power of green as explained above..then 300mW could be sufficient. You must take also the blue power into the calculation!

Greetings!

[deejay_bamse]

But Al the lasers of mine are Analog modulation soo the green is not a problem by I dont want to fade the blue soo I want a red to go well with my blue on full effect..

So what I can chose from if I can change is:
400mW 671nm... +400$ But good beamdata...
250mW 635nm... +/- 0$... Bad beamdata...
250mW 660nm... -300$... Bad beamdata..
500mW 660nm... +/- 0$... Bad beamdata...
300mW 635nm... +100$... Bad beamdata..
400mW 635nm... +200$... Bad beamdata..

Which should I chose for my Blue/Green(faded)?

[Dr.Ulli]

I think, Guido and me gave you now enough information what should be taken into account for the selection of the aproppriate Laser!!!
Shall we tell you, what kind of paper to use for the toilet???

One tipp more: If you fade your green laser by electronics, you will loose half of your modulation range...(e.g from 256 steps - 8bit- you will loose 128 steps) thus it is better to use a beam-splitter (in the simplest case this can be a thin piece of glass - transmission/reflection is dependant on the angle of incidence). Than you will preserve the full range (256steps) for modulation! And think about the nonlinearities when you modulate!

Greetings!

[deejay_bamse]

Yes You to come with alots of information... But if I wrote if 671nm 400mw would be enough... Ive got the answer that Guidos 400mW 650nm would be good and his laser only got 1mrad and a beam smaler then 6mm....

1: The 400mW 671nm has the same beamdata as my green and blue.. 2mm 1mrad.... But will I see it good with the blue in a beamshow? (Yes/No)

2: Or can I have a 5X1mm beam without it will be to bad?? And in that case wavelength and power from the list?? (mW/nM)

And I can fade the green with electronics and still have 256 steps... So thats is not a problem....

(I like white soft toilettpaper.... With blue lambs..)

[contact23]

Hi,

And I can fade the green with electronics and still have 256 steps... So thats is not a problem....

You are my god how does this work?

A 300mW 650nm with good beam data would be fine i think.
In one projector i have 120mW 473nm 150mW 532nm 350mW 650nm

greetz Matthias

[deejay_bamse]

To fade electronicaly must be the most simpliest thing to....
2 Resistors......

I dont know where everybody gets 650nm from? I wrote 660nm everywhere......
As it looks now it will be a 660nm 500mW with a 5*1mm beam....
And hopening that my 2mm blue/green beam doesnt get to ugly with the red 5*1mm beam...
Have anyone a beampicture on a laser with bigger red beam?

[Dr.Ulli]

Yes, to fade the Laser with a potentiometer or resistors in front of the analog-input will work. That´s right. I ment to fade the laser by programm...sorry wrong or no good explanation above...

Back to your question: For beam-shows i would prefer a shorter wavelength than 671nm. You will need very much power with that long wavelength - see the chart form contact32 above.

Photos with a big red beam and small green and blue beams you can see at HE-laserscan.de in the gallery - there are pictures taken from my laser-shows. You will notice the bigger red beam very hardly - when scanning - only on the wall.

[deejay_bamse]

Thanks for the answer....
I didnt se much of the big red beam so I think I will use 635 or 660nm....
is the 635nm laser red or is it more like orange-red?
Will 635nm 250mW be god with my blue?
Or 660nm 500mW? Its the same price for me.....

[Dr.Ulli]

I would prefer the 660nm with 500mW...but 300mW should be enough for your 80mW blue...

[deejay_bamse]

Ok... Thanks for the adwise.....
500mW 660nm it will be.....

[bridge]

Not all Chinese laser company are made fat beam red lasers.
you can contact our Germany distributor Mr Christian Lorner, www.laserbay.de for more informations.
Best regards!
Bridge