Any update on green laser diodes?

[blrock]

Does anyone know of the current progress on green laser diodes?
My christmas wish is that they bring one with similar operating specs to the 445's.

Imagine 2+ watt greens to play with

My future laser build (2012....) HOPEFULLY

two x 2W 54xnm
two x 2W 445nm
=8W Cyan OMG

 

[DrSid]

I guess the first ones will be pretty weak.

 

[Haloid95]

2w greenies would be beast. The beam would be really visible and nice.

 

[rhd]

From what I understand, the green diodes under development will be much lower wattage than blues. I think we're looking at around 50mW - 75mW.

It makes sense if you think about it. Suppose KasEO is running their 445s at somewhere around 500mW each (precision isn't important right now). That's approx 12W of 445 in a projector. No raleigh in the calculations - 12,000mW of 445 is balanced by 500mW of 520 (the general wavelength area they've been talking about for green):
Dot: (445nm 12000mw) vs. (520nm 503.66mw)
So even at 50mW per green diode, they'd only need 10x in a projector to balance out 24x blues. Even if some of the newer KasEO projectors are running the blues at higher currents, we're still in the range of 50mW greens being just fine. Now, of course, there's always the potential that they might want to accomplish that whole 500mW of green with one diode, for "simplicity" of manufacturing purposes... and as awesome as that would be, it's just that much more expensive for us!

Nichia was talking 50mW:
https://www.semiconportal.com/en/archive/new-product/device/100816-nichia-green-laser-sampling.html

Soraa was talking 75mW:
Soraa Demonstrates Green Laser Diodes for >20 Lumen Pico Projectors with Minimal Speckle | Business Wire

But Nichia doesn't even have it listed as an engineering sample on their site, so my sense is that it's either not ready for primetime, or they're all keeping tight-lipped for competitive reasons.

 

[Prototype]

These are going into pico projectors first, not full sized ones. Current pico projectors using 638nm and 445nm only need about 60mW of 532nm, so they're probably only going to need about 75mW of 5XXnm when these diodes come out, if that.

 

[rhd]

Do we have any leads on actual pico projector models known to be integrating them ?

 

[Johnyz]

I think LASER66 has some, but they are only the regular DPSS modules in a slightly longer diode can.

It would be indeed interesting how many diodes would KasEO put in a projector like that.

 

[Coherent Light]

Here is some more info on Green Diodes. I'll Edit post as information is available.

Soraa green laser Direct Diode 520nm-525nm 75mW

Nichia's green laser Direct Diode 510nm 50mW 200ma. Nichia states They are sending them to projector manufactures. Doesn't look very Green to Me

[/IMG]

Sumitomo Electric Industries 531nm. Not much info on these yet.

[/IMG]

 

[Johnyz]

I heard from argon laser owner that 510nm is still very green compared to a 445 or 473.

Edit: According to rhd's wavelength to RGB:

Soraa 525nm = #36FF00
Nichia 510nm = #00FF00
Sumitomo Electric 531nm = #4CFF00

 

[rhd]

We're keeping track of some of this stuff here:
http://laserpointerforums.com/f44/list-visible-wavelength-laser-diodes-62217.html
Coherent, thanks for the news on the sumitomo - didn't know about that one.

 

[Meatball]

Awesome, I didn't know that they had pushed them up to 531nm.

 

[chipdouglas]

From what I understand, the green diodes under development will be much lower wattage than blues. I think we're looking at around 50mW - 75mW.

It makes sense if you think about it. Suppose KasEO is running their 445s at somewhere around 500mW each (precision isn't important right now). That's approx 12W of 445 in a projector. No raleigh in the calculations - 12,000mW of 445 is balanced by 500mW of 520 (the general wavelength area they've been talking about for green):
Dot: (445nm 12000mw) vs. (520nm 503.66mw)
So even at 50mW per green diode, they'd only need 10x in a projector to balance out 24x blues. Even if some of the newer KasEO projectors are running the blues at higher currents, we're still in the range of 50mW greens being just fine. Now, of course, there's always the potential that they might want to accomplish that whole 500mW of green with one diode, for "simplicity" of manufacturing purposes... and as awesome as that would be, it's just that much more expensive for us!

Nichia was talking 50mW:
https://www.semiconportal.com/en/archive/new-product/device/100816-nichia-green-laser-sampling.html

Soraa was talking 75mW:
Soraa Demonstrates Green Laser Diodes for >20 Lumen Pico Projectors with Minimal Speckle | Business Wire

But Nichia doesn't even have it listed as an engineering sample on their site, so my sense is that it's either not ready for primetime, or they're all keeping tight-lipped for competitive reasons.

your calculations might be right but you forgot one thing... the 445's inside are so strong because they light up that phosphor reel to make the green. so if they have a green diode in there i doubt there will be the need for 12W of blue, and a lesser need for a stronger green bank.

michael.

 

[rhd]

You're right, of course - that slipped my mind.

In fact, judging by the wheel itself, we've got maybe ~30% blue pass, and the rest used for green:

So in reality, perhaps only 1/3 of the blue in our current projectors would be needed with a working green laser diode replacing the wheeled approach.

 

[InfinitusEquitas]

I guess the only place I'll be seeing a 1W green beam anytime soon is in my dreams

 

[rhd]

There are plenty of 1W green beams...

They just result from DPSS

 

[DrSid]

Which makes them kinda expansive ..