Kvant makes me jizz in my pants

[p1t8ull]

The Kvants are nice in that video don't get me wrong, but the saturation of OPSL just can't be bettered from what I've seen

But that's like comparing an M3 to a Mini Cooper S... You keep saying OPSL's have amazing saturation, but they are very powerful lasers and will look bright and vivid next to 1w RGB's, it's not really a fair race.

I think the green/yellow OPSL's have awesomely nice tight beams and I can definitely see the appeal of their compact size when it comes to building them into projectors, but the colour gamut is all rather light/pastel for me with all the lovely soulful deep magentas/reds/oranges missing when compared to an RGB.

[JeroenVDV]

I think the green/yellow OPSL's have awesomely nice tight beams and I can definitely see the appeal of their compact size when it comes to building them into projectors, but the colour gamut is all rather light/pastel for me with all the lovely soulful deep magentas/reds/oranges missing when compared to an RGB.

So.. you haven't seen the RED opsl yet

Combining OPSL RED, GREEN, YELLOW and deep BLUE is awesome, it gives you a small laserprojector outputing more power than the Jenoptik, in a 500% smaller case (or so).

[buffo]

Yep its not made by mixing Adam but red HAS to be in there as yellow isn't one of the prime colours R,G,B

Um.... No, red doesn't have to be there. Not at all. You really need to read up on color theory, and the electro-magnetic spectrum in general. "Prime colors" doesn't mean what you think it means.

So for the diode to output yellow it has to be lasing at both red and green wavelengths simoultaneously.

Nope. Dead wrong. It is perfectly possible to generate yellow without any red or green. This is how a yellow hene works. The yellow light is generated as yellow (at 594 nm). It's not making red and green and then combining them.

You can also get yellow from a copper vapor laser, and krypton has a yellow line too. But as a general rule, the yellow lines have much lower gain. (Well, with the exception of the CVL, that is) Thus it is usually *easier* to fool the eye into thinking a beam is yellow by mixing red and green, but you don't *have* to do it that way.

In fact, AVI used to market a projection system (ChromaDepth) that used a krypton ion laser to generate 4 distinct lines - red, green, blue, and yellow - which would give 4 different depth effects when the audience wore special diffraction grating glasses.

Whether or not you can separate the red out is another matter.

No it's not. If red and green exist in the initial beam, they can be separated with a prism or grating. Always. If the initial beam is pure yellow to start with, then there is no red or green to separate, so passing it through a grating or prism will leave you with the exact same yellow beam you started with. (This is why you need the pure yellow krypton line for the ChromaDepth glasses to work correctly. If you make yellow by mixing green and red, they will be separated by the gratings in the glasses.)

To put it another way, a yellow-only beam (at, say 594 nm) might APPEAR to be the same color as a mixture of 635 nm red and 532 nm green does, at least to our human eyes, but fundamentally the two beams are very different, and this can be demonstrated with a spectrophotometer. One has a single color component (yellow, at 594 nm), and the other has two color components (green at 532 nm, and red at 635 nm). Remember, our eyes are *not* perfect color receptors. (Far from it!)

Adam

[White-Light]

According to the Wiki, dedicated yellow lasers work by making a crystal lase two beams of 532 and 671 simultaneously and then using another crystal in such a way as to generate a wave of incidental light at yellow frequency:

Lasers emitting in the yellow part of the spectrum are much less common than most other colors.[19] They are also much more expensive than comparable lasers because the difference in energy levels between the metastable and the ground state required for laser action is difficult to create for yellow photons. In commercial products diode pumped solid state (DPSS) technology is employed to create the yellow light. An infrared laser diode at 808 nm is used to pump a crystal of neodymium-doped yttrium vanadium oxide (Nd:YVO4) or neodymium-doped yttrium aluminium garnet (Nd:YAG) and induces it to emit at two frequencies (1064 nm and 1342 nm) simultaneously. This deeper infrared light is then passed through another crystal containing potassium, titanium and phosphorus (KTP), whose non-linear properties generate light at a frequency that is the sum of the two incident beams; in this case corresponding to the required wavelength of 593.5 nm (yellow).[

http://en.wikipedia.org/wiki/Yellow

So I guess we're both right. You do need red and green to make yellow but its also possible to use the red and green to force a crystal to emit light at a wavelength of the sum of the two frequencies = dedicated yellow.

So you have a dedicated yellow beam but it is still produced by combining red and green. You just can't separate them back out.

[buffo]

According to the Wiki, dedicated yellow lasers work by making a crystal lase two beams of 532 and 671 simultaneously and then using another crystal in such a way as to generate a wave of incidental light at yellow frequency:

That is *one* way to make yellow. It's not the only way to make it. (The specific technology is called sum frequency generation. It's complicated, expensive, and the efficiency is lousy, but it *is* solid state...)

In any case, there is no 532 nm green *or* 671 nm red in the output beam of such a laser. The "non-linear properties" of the KPT crystal they're referring to is the frequency summation magic that re-modulates (for lack of a better word) the two colors to make yellow. But as I said, this is a very unique example. It's not indicative of any hard and fast rule about the creation of yellow light...

A better example is a yellow HeNe. A yellow HeNe has mirrors that reflect light at 594 nm and pass other colors. Thus you only have gain in the cavity at 594 nm. And the output light is yellow at 594 nm.

A krypton ion laser can also generate yellow, assuming it has the correct optics installed to reflect the 568 nm krypton line. None of these methods involve "mixing" red and green. They generate yellow directly.

So you see, you don't need red and green in order to make yellow.

Adam

[mccarrot]

Combining OPSL RED, GREEN, YELLOW and deep BLUE is awesome, it gives you a small laserprojector outputing more power than the Jenoptik, in a 500% smaller case (or so).

Yes,even a 5W Argon gas laser looks like a hand held laser pointer next to the yenlas

[mccarrot]

To be honest, the amount of (RGB) lasers is of course wonderful and special, but the show is CRAP. Most of the effects can also be done using normal moving lights. Just give me a rig with the same amount of moving lights and a descent lighting controller with SMPTE and I'll win the race. Every lighting operator will win that race

If someone can loan me 30 pcs 4W RGB projectors I'm willing to take up this challange.

I have never seen a moving light show wich was more impresive compared to a lasershow with the same amound of scanners.

Or lets make the bet even more intresting. give me 10 simple boring single color Green lasers in an round trus simular like hugo did:

http://www.youtube.com/watch?v=wy-yTdmZkhE

And you take the lates full colour state of the art fancy moving heads and try to make it more impresive compared to the simple green lasers.

[-bart-]

I am afraid I'll have to fully agree with Jeroen.
These full color laser projectors are controlled as if they were just a bunch of scans, nothing more.
What I see is nothing more than 10 static frames controlled in x-y position.

Thats just like parking 24 red sport cars in the shape of the pangolin logo.
It sure looks nice but it's an insult to their true potential.

[pelosh]

Hi all

I am in KVANT right now and for next 3 days, so...like in heaven.

There are 24x1W RGBs and 1x25W RGB.

Made in Fiesta2 using Matrix interface.

Have a nice day.

[Pitts]

Hi Martin,

Hope you have a great time..
Can you see if you can find my one while your there
Cheers
Ray
NZ