1W 520nm Nichia Laser Diode TEST

[dsli_jon]

Hey Alex -

...As no official datasheet is available I did not want to do something wrong.

..Well that's certainly very under$tandable..

It´s getting hot as expected....like the 1,6W 445...

Got it, so.. nothing other than good, solid-contact heatsinking / heat-wicking design in the mounts.. As with the 445s, we deliberately chose not to 'TEC'.. creates as many / more problems than it solves, in many cases.. ...Will be interesting to see what these pups could do in Chad's 20x 'Lamblueghini' chassis..

The prisms you got from me are broadband AR coated.... losses are <10mW for 2x magnification..

Actually, we got 445-coated.. Not-talking about the 'first couple', for testing / few-others for relay-steering, etc, but the 60x (iirc) pieces sent directly to Chad.. Those are the ones I was Ref'ing, but.. If your BBAR ones are bouncing 520 with that low-of loss, that sounds like a winner, too.. Will be keen to try 'em out..

cheers..
j

--

..(color-discussions, moved, here: http://www.photonlexicon.com/forums/...856#post282856

[absolom7691]

..Buut with what Red? Not sure why everyone that's 'worried' about the 520's 'color mixing' is forgetting the role the Red-plays...

I was thinking the exact same thing. I don't understand why people keep thinking that this is a green substitue, it isn't. It is green! I have found the yellows to be brighter. I am using 638nm red and I see no problems with oranges or yellows. 650 and 660 might be causing the offending yellows and oranges.... maybe even 642 too. I find the spectrum to be quite pleasant with these 520s when using 638 and 450 (though I am not a fan of such a deep blue).

[lasertack]

Hey Alex



Actually, we got 445-coated.. Not-talking about the 'first couple', for testing / few-others for relay-steering, etc, but the 60x (iirc) pieces sent directly to Chad.. Those are the ones I was Ref'ing, but.. If your BBAR ones are bouncing 520 with that low-of loss, that sounds like a winner, too.. Will be keen to try 'em out..

cheers..
j

--

Hi,

Sorry, I thought you mean anamorphic prisms. Sure, the prism mirrors for red or blue wont work for green.

I'm thinking about an order.

Is there some interest in 520nm coated mirror prisms?

Alex

[White-Light]

Can you compensate for the bad yellow by pallet training the control software?

I'm assuming most software is written with 532nm in mind as 'standard green' but I'm sure I've seen discussion before of "training the software pallet" for projectors with non "standard" colours or more than the three rgb lines...

That's what I'm hoping Wookie.

In Beyond you can set colour mix points for any colour you want so it should be possible to compensate. However, until someone tries it, nothing can be said for definite as my understanding is that setting colour points affects the whole colour curve and so the effect on other colours would have to be observed as well. From my observations I would imagine you'd need to manually set points for both yellow and orange at a minimum.

It could also be the case that setting additional colour points could reverse any adverse effects on other colours, however again I think this needs to be tested. I'd happily do it but I don't have 520nm green or the money or inclination to start tearing an expensive Kvant apart to experiment. 520nm may never be a reality for me or if it is, it will be when it very very cheap and I'm confident in replacing the DPSS without trashing the rest of the projector!

[MIIKKKLLLL]

The Beyond advanced color adjustment settings (or any other software based correction system) won't change anything about the quality of yellows ang oranges colors and I explain you why :

Here is the color gamut for the "best" yellow by mixing a green dpss @t 532nm and a red @t 637nm :





Here is the color gamut for the "best" yellow by mixing a direct green diode @t 520nm and a red @t 637nm :





Here is the color gamut for the "best" yellow with a 577nm OPS laser :




When you obtain a color by mixing 2 primary colors, the result can only be situated on the straight line connecting the two points (wavelength of each primary color).
As you can see the yellow shade is really thin in the color gamut (= hard to obtain because of its high gradient who shifts the perceived color by human eye). When you shorter the wavelength of the green light source, the result in yellow decrease. You lose the "saturated" color character.

This is why it is impossible to obtain such a beautiful yellow as OPS laser @t 577nm .


In short ;
520nm diodes are nice for modulation, alignement, cold hues (and maybe price in a few months) BUT give poor results in warm hues...

[masterpj]

You lose quite a bit of the color gamut.
Adding 650nm might help a bit but really I didn't like the yellow.
The yellow is a "weak sandy yellow". Not a deep yellow color.
The dark orange looks nice but the pure orange looks a bit off too.

Full diode is great and the divergence of the green is quite good and sure while a diode is so much more stable and linear, the properly made DPSS greens have come a long way. The modulations of 532nm greens are quite nice if you adjust it well.. the badly made DPSS chinese modules are really badly adjusted and this shows and people seem to associate that directly to dpss itself being bad.

The 520nm diodes are interesting when they drop but for now I'm really sticking with a well calibrated and color synced (with a color delay board) DPSS green.

Anyhow if you people want to get rid of their 532nm green modules please message me.
I'm interested in DPSS greens at a power of 2+ to 1.5watts.

[RGB LASER VERKOOP]

As seen on the Dutch LEM RGB with 1w 520nm,amazing modulation and colours! looks perfect to me ;-)

[sbk]

You lose quite a bit of the color gamut.
Adding 650nm might help a bit but really I didn't like the yellow.

650nm or higher shouldn't help as it will drive away even further from the ideal yellow...
I tried every levels with analog mixing and couldn't obtain a correct "bright" yellow However I found the cyans with 520 better than with 532.

Now we need a 532nm diode!!

[MIIKKKLLLL]

Or a 570-580nm diode and the problem is fully solved .

[sbk]

Or a 570-580nm diode and the problem is fully solved .

Damn that would be mega cool! But I have little hopes We'll have to stick to OPSL for a long time for that wavelength...