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Hi Blackbird,

for the green laser (Coherent Verdi) it's <0,5mRad @ 3mm Beamdiameter. This <0,5 can mean everything, so we measured it with our Modemaster System. It's excactly 0,39mRad.

For all other lasers it's quite difficult to tell. All other lasers are Jenoptik Whitelight lasers (which originally were built to be used as light source for the Schneider Laser TV Projection System). These lasers are designed to be used with optical fibres and normally do something up to 14W RGB (real 'xenon' whitelight...628/532/445@1:1:1...not 'green' whitelight). We did some 'pimping' on these systems in our company, and now every laser is optimized for doing only one colour or a mixed colour out of two colours. The divergence is something about 0,4mRad @ about 1,5mm Beamdiameter. Some of these lasers have a smaller beam and some have a bigger beam. So for some colours the divergence is bigger than 0,4 and for some it's a bit smaller than 0,4mRad. Our Blue system reaches 0,3mRad@445nm@8,5W@4mm Beamdiameter (this one burns really everything...it's 'only' 8,5W, but the most powerful laser I ever worked with )!

But we always have problems with the handling of such high-power-beams, and because of this the beams normally don't reach these perfect divergences in Rainbow-projects. We have big problems with all kind of mirrors. It's too much energy in too dirty air. The best would be running these lasers in a clean room with a window. And not only mirrors are a problem, we also have problems with differences in optical density of air. The beams in Toulouse were shaking all the time, because of temperature differences between in- and outdoor. So the air has different optical densities and begins to move/deflect the beam and also wides it up. So in vacuum our rainbow would look much more sharp, I think.

What's also very important: All these lasers are real TEM00-Lasers with only one lasersource (no diode arrays). For every colour (also the mixed colours) it's a frequency doubled and/or sum-frequency generated Beam out of a 1064nm MOPA (Master Oscillator Power Amplifier). This means you first have a high quality but low power master Beam which second is amplified 4 times from double side pumped YAG-crystals. So it's only 1 high power and high quality Beam, generated out of the power of 9 pump diodes. And this one is used for frequency doubling and/or sum frequency generation. This sounds complicated, and ouf course...it is!

Tobias

blackbird wrote:...Ps for Tobi: there was an argon laser in the mix mentioned above ??

Bonjour,

Je fais partie d'une communauté de passionnés de laser organisée autour d'un forum : Laserfreak. Cette communauté principalement française, belge et allemande a pour objectif de faire partager notre passion et de s’entraider afin de construire ou améliorer des projecteurs laser.

J'ai vu sur votre site internet que l'exposition Global Rainbow sera à Nantes à partir du 9 septembre. J'aimerai savoir si il est possible de visiter l'installation du Global Rainbow afin de faire profiter le reste du forum sur cet événement assez rare.

Cordialement

kl79 wrote:tu comptes sur moi pour la visite

doctoritchy wrote:hooo , photo oiui , sinon se sera le fouuuettt

Hello,

I'm a member of a laser community : Laserfreak. This French, Belgium and German community shares our passion and helps people to build or upgrade laser projectors.

I saw that your are the company that installed the Global Rainbow in Nantes. I would like to know if it's possible to visit the installations to share the event to the other laser enthusiasts. This event is very unusual and amazing, it would be a honour if we could have more informations about it.

Best Regards,