Want to buy green laser, class IV, power > 1W

[Leodahsan]

What is it for?

 

[hakzaw1]

go here and have a look JL sells and ship world wide & have NO FEAR apying Jl with Western Onion- 100% trustworth company- PPal? dont even ask=for starters PP nor ebay wants anything to do with most high powered handhelds.

jetlasers.org
you want to deal with Gray and tell him where you got this from. DO NOT order using that link- get with Gray or me directly. other wise you will NOT get the forum member deals. last time I looked they had 2+W IRs very cheap.

and YES we wold like to know the purpose you have for these. hard to give good advice if we do not know this.

 

[MorgothV8]

This is basically for lab-like work.
It have to travel over 500m in the air, and will be detected on the other side - so divergence is a factor too.

 

[Things]

If divergence is a factor, IR is a definite no-go, their beams are more comparable to a flashlight.

 

[MorgothV8]

That's why I've written that IR may not be applicable.
But I don't actually know.
Those IR I saw had 1,5 mrad -> it gives beam size of ~75 cm:

mac:PHP cleverstep$ php laser.php 
args: <input beam diameter [mm]> <power [mW]> <distance [m]> <divergence [mrad]> <opacity %/km>
mac:PHP cleverstep$ php laser.php 1.5 1500 500 1.5 0
input diameter:  1.5 mm
input radius:    0.75 mm
input area:      1.7671458676443 mm2
input power:     1500 mW
input beam:      848.82636315678 mW/mm2 (sun equivalents)
divergence:      1.5 mrad
divergence:      309.39720937064 arc seconds
divergence:      5.1566201561774 arc minutes
divergence:      0.085943669269623 degrees
distance:        500 m
opacity:         0 %/km
opacity factor:  100 %
arcus tangens:   0.00074999943750076
delta diameter:  749.99943750076 mm
delta radius:    374.99971875038 mm
output diameter: 751.49943750076 mm
output radius:   375.74971875038 mm
output area:     443554.71592066 mm2
output 100% op.: 0.0033817699286243 mW/mm2 (sun equivalents)
output beam:     0.0033817699286243 mW/mm2 (sun equivalents)
output luxes:    338.17699286243
output power:    0.00039840538364614 % input
power loss:      99.999601594616 % input

Edit:
I've already have <500 mW 808nm IR - bought it as a cheapest test option.
It is NOT enough - but it was a test - about 80$ is not a problem - but I had to pay for that from my own money.
It would be super to have 1W green for a test, but ..... rather impossible.
Ohhh and 405 or 445 nm is bad - it begins to ionize the air - which is total no-go! (I don't actually say that air turns into plasma, but ionisation levels are higher and some fluorescence efects also comes in, and near UV light is much not like sun's light at all - UV levels in sunlight are just few percents, while visible and IR are most of it).

 

[Things]

405 and 445nm won't ionize the air at the powers you're taking, you need pulses in the kW ranges to do that, but yes, blue/UV wavelengths scatter more than the others.

 

[Encap]

This is basically for lab-like work.
It have to travel over 500m in the air, and will be detected on the other side - so divergence is a factor too.

500 meters is nothng for a 1W+ 445nm unless that wavelength is no good for your application for some other reason and they are not expensive. Many of the members build and sell them all the time at output powers or 1W to 3W and many manufactured 445nm are available.

An off the shelf manufactured 1W 445nm ( probably outputting less than an actual 1W) was used to signal the International Space Station in orbit at 310 miles away from a location on the ground in Texas and the astronaut was able to photograph the blue dot so---distance od 500m -1000 meters is nothing depending upon the atmospheric make up. You could used a beam expander to improve divergence if that is needed.
See: Amateur Astronomers Flash the Space Station
Is divergence something you need to be concerned with?

What type of detector are you going to use? -- human? electronic?

 

[MorgothV8]

Detector will be electronic.
Beam expander is an option too.
I'm not the only one to work with that - and I was told to get laser.
I cannot write too much about it - this is not only my work.
Lasers blue/violet and UV are not applicable due to their effects: fluorescence, ionization (but yes I've checked google just reading Your posts and in fact this should not be a problem even with 405nm at such powers).
But let's say that UV laser are too far different than sunlight is (I'm taking 405 as UV laser in reality - it is visible of course but behaves much like UV)

So reality is such:
IR with smallest divergence, outputting 2W (eventually with beam expander) - I would opt for this - but the others are skeptical to IR.
Green one about 1W....
Hmmm maybe orange, yellow at 1+ watts are an option? I have really no idea if there are such laser - and I was NOT searching for them - so forgive me.

As I said - I have one <500mW IR class IIIb - it is not enough - after initial tests, and divergence is totally unknown.

Ohhh and time is not a limit - I have plenty of time - so relax, read, learn and possibly borrow something (really anything from 1000 nm down to 400 with output class IV) maby just 445 nm 1W would be OK - but I don't want to buy such - too risky. I know for sure 1W+ of green will be enough.

 

[Cyparagon]

You have NO idea what you're doing, do you?

 

[MorgothV8]

Believe me I do.
I've also get some informations needed - thanks.
It will probably take time to make some decisions.
Thanks Guys for help.

 

[MorgothV8]

OK tests made.
Not by me.
Result is that no matter of wavelength (in normal areas like 300nm-1200nm) the power and divergence is critical.
After googling a lot it seems that IR lasers have BEST power/price ratio...
So anybody can suggest some good laser at IR (no really matter which wavelength 808-1064 seems to be most popular) at maximum available power and sane price.
maybe thinking about 5 watts.... smallest divergence possible - what are best prices for such stuff?
Best regards.

EDIT: sorry but I cannot share any more info
you can blame me.... I have no way to modify this... decision was made to use IR - because of just MONEY. Distance will not be 500m, it will be shorter - depending on divergence.
I see it is hard to find less than 1.5 mrad.

EDIT2:
My only decision was to convert My Nikon D3200 into IR 830+ in irstudio.pl.
It will see this "light" and allow some video and photo.
Conversion is:
Remove hot mirror filter (IR block on sensor)
Replace it with IR830 filter (allowing pass 50% or more of IR 830nm into matrix)
So camera will capture IR and block visible - making monochrome photos/videos available out of the box.
Bayer filter (CFA) remains there, but according to internet curves of R/G/B transmittance of IR light above 830nm - this is not an issue - camera may be slower 1-1,5 stops - that is all.
Auto focus will be callibrated to Nikkor 35 f/1.8 in IR 830nm-1200nm (CCD response ends at 1,2 um)

 

[kilter]

1W yellow! 0.o $X,XXX,XXX!!!! ok might not be quite so high, but close enough.

 

[Shakenawake]

the lowest divergence I have seen listed on any laser was .9mrad: Optotronics RPL Portable Green Lasers

hope you aren't up to anything nefarious, but at least with this advice it will cost you a lot if you are.

there is a 450mW one in the buy sell trade section last I checked, $800

 

[MorgothV8]

Ohhhh.
It is beginning to make me angry. Mine team not You.
Everything I found is bad for them.
they really don't know what to get.
the problem is that people who knows what is needed have no money.
And people with money don't even know simplest things about lasers.

 

[DrMario]

Infrared is the way to go, IMO. It has to do with Rayleigh scattering. UV will scatter out too easily, whilst Infrared won't. Of course you will have to deal with safety issues - Infrared is what it is: heat.

And, I recommend Infrared goggle and infrared viewer. Infrared is even more scarier to work with because you can't even see where the light's being reflected, maybe in your face. Good thing you don't have any desire of working with blacklight UV-A spectra, they're even worse than Infrared. Ever wonder why 200mW 405nm purple diode can mark the wood easily than 445m green laser five time the wattage (1W)?

 

[MorgothV8]

No progress... business talk only....
To be honest:
I'm hunting for Sigma 50 mm f/1.4 HSM personally.
Lasers are intersting but I haveno idea and no power decision what is next step in this case.
I'm going to buy Sigma and Nikon 800E personally.....