I wonder what would it do on top of White Flat die…
If I knew how to remove the phosphor layer from a white flat I could try it.
All I know is that Saablaster claimed to be able to swap phosphor from SST-40 to XHP35. As well as to lift the die off the XHP35 package and put it on a diamond heatsink. Osram LEDs are different, but maybe he would be capable of doing a similar surgery to them as well.
Would he be willing to help you with that? I have no idea.
Very nice! Do you plan on beating polar-li’s BFF (farthest thtoewing portable light)?
My plan was to kill a Weltool
take the inside
and put it together with a 120 mm lens and Collar.
But I do not do this,cause the power is to less,
If yo wanna sell 2 pieces of the single crystal YAG:Ce phosphors
I will buy it.Send me a message please .
Thanks in advance
Which one? Is it on the list or am I missing it?
Sounds good, I’ll let you know if I have spares
A conservative estimation puts the throw at around 250Mcd.
Well I only have very rough theoretical numbers which are probably not anywhere close to real performance, but I have high hopes.
Once I order the laser and start doing intensity test of the phosphor crystal then I will have a better idea.
Sounds like a fun project!
I know you are all about the luminance, but I wonder how much output you can get. Say you get a 10W output blue laser. Max theoretical efficacy for excited phosphor is 300 lumens/W. Say you get half that to account for phosphor inefficiency and light emitted backwards. Then that is 1500 lumens. Is that on the right track?
You could put a hemispherical reflecting collar on the bottom too to recycle the light going down.
Yeah probably about that much.
A research paper got 4k lumens with 14W of lasers.
The highest power single blue laser is about 7W though, so about 2k lumens, not sure how much will be wasted out the back, maybe 50% or maybe less.
Possible, but I need to have cooling on that side so I can’t fit a second collar.
Wish i had the funds for such things…
Planning to make it a ‘shine through’ set up?
Does that phosphor emit only yellow or is it a wider band?
Are you gonna get pieces of diamond to $andwich the phosphor?
Yeah it will be through.
It emits a spectrum of light like a regular phosphor would:
I bought the yellow.
No I can’t afford diamond plates for cooling
My imagination runs wild, but i have no data / specs…
Is the phosphor water resistant?
Thinking glass - water - Phosphor - water - glass sandwich, water pumped through the sandwich.
Because obviously the Phosphor will get crazy hot when you point a metal cutting laser at it…
I’ve been thinking about the ‘reflecting LEP’ too, with an extremely tiny parabola behind the Phosphor, a tiny dent in a aluminium (coated) heat sink.
The dent has to be filled with a piece of Phosphor.
I think it will produce horrible tint shift artefacts though…
Other than that, it’s so small, how are you gonna shape a 1 - 2 mm diameter parabola in a piece of metal, and coat it with PVD ?
Let alone put the right shape of Phosphor in there…
How thick is the Phosphor you bought?
Yeah it’s water resistant, it’s just a crystal.
Water would change the refractive index and would probably make focusing stuff problematic.
Also even though it has very high heat capacity the conductivity is not that high so the small area of the crystal wouldn’t dissipate much heat.
There have been experiments using liquid which has phosphor particles in it within a cooling loop so it’s cycling the phosphor through a radiator for cooling.
The phosphor plates are 0.25mm thick.
So is salt.
You’ll get it focussed, i’m sure.
Maybe i’m under- or overestimating something, but 0.25mm of anything sandwiched between running water will have a very hard time getting hot.
All will go dramatically wrong though, when the water reaches 100°C somehow…
Can’t imagine that happening with proper water flow though, but i could be wrong.
But water is an awesome cooling medium. Very high thermal capacity.
Oh, and it’s as clear as water, of course.
You’ll need more Phosphor though…
But i guess powdered Phosphors, as used in LED dies are not that expensive.
One more question.
What diameter laser beam do you plan on hitting the Phosphor?
1.5 mm ? Less?
It will be concentrated, not sure how small I can go before burning the crystal but I’m gonna try .1mm square.
.1 mm² ??
0.1 x 0.1 mm
Wouldn't that be 0.01 mm²?