You can get them here for example. They also offer complete modules like this one. Last year they also offered modules without the pre-collimator lens for use in reflectors. I have one of those. You can find a test of this module here (in German), done by someone I know. Here is a BLF-thread on these modules. Here you can buy a similar module, but with pre-collimator.
The_Driver: Great, I owe you for this help, was able to open and go to each link fine, translating the German to English using an online tool. I ordered some transmissive white phosphor plates through Alibaba a few minutes ago.
I've received a response from one vendor, and found more information from another the blue pump wavelengths vary some, these two show 440 to 455 nm. While both in the blue spectrum, these wavelengths are far different from the 410 nm violet-blue laser diode pump which works so well with some phosphor wheels I have from laser projectors, the 450 nm wavelength not working well at all on them.
If and when I get the transmissive plates I just ordered I will try both 410 and 450 nm and report back how well they work with them, I expect the 410 nm won't work well as the plates I ordered are designed for closer to 450 nm.
Why are laser diodes used to pump these phosphor plates? Simply because they can be focused into a much tighter beam spot upon the target and not because coherent light itself is needed beyond that characteristic?
Chris
I have the new Ant-man titanium coming with the new driver going to make a vid on it see if it’s Actually 300 lm with more range
Blue Laser diodes reach a much higher luminous intensity than blue LEDs. As long as the Phosphor doesn't overheat this is also the case after the conversion to white light inside the Phosphor. The luminous intensity can be much higher.
The "tighter beam" is just a byproduct of physics. The emission surface of a laser diode is much smaller than a typical blue (white) led.
I think everybody here would enjoy you letting us take part in your progress with whatever you are building. Pictures etc. are always welcome. A new thread would be good idea if you plan on doing that.
I understand the physics of a laser diode, for the most part, although for me there is always something more to learn as I am just a hobbyist with them. When you say luminous intensity in my view this is simply due to the size of the focused spot they can produce being much smaller than an LED can possibly focus down to, so in that respect, if I understood you, I believe we are on the same page.
I'm guessing it's the amount of power density we can achieve with a finely focused laser diode output compared to an LED is what makes the difference and why laser diodes are used. Perhaps the narrow line width of the laser diode could help too? There are so many things I need to understand about how this phosphor behaves for maximum efficiency or output.
Am I correct that the beam from the laser diode is focused to a very fine point, or is the beam focused to a larger spot than they can really produce in order not to burn the phosphor target? I've been trying to find the answer to that question too. The drawings I've seen of LEP's appear to show the laser diode beam focused down to a tight spot in some illustrations.
I always have lots of laser projects being worked at the same time, at least for gathering parts and then later assembling. Seems I can't just start and finish one project at a time, this slows my progress on any one thing. My current laser projects are a 2 watt 577 nm OPSL laser and an eight X 525 nm green 1 watt NDG7475 laser diode pointer, all outputs being run in a tight circle with a long focal length collimator for each beam to reduce the divergence. Those eight diodes can be pushed harder to 1.25 watts or more output each to allow over 10 watts total of 525 nm green.
Thought this was interesting.
laser module $24.62 | 4.75W white laser/4.75W blue laser diode converted to white laser module
Tried the link, but doesn't work.
Thanks! I see, but the price displayed for me is over 100 USD for the LEP module, maybe you meant the laser module alone? The price displayed for that here is close to 90 USD. Still not too bad a price for use to build a multi-output flashlight using several of them.
Better to use 1 and a big lens or 2
For these LEP flashlights, do you know what the relative relationship of the divergence is when using a lens focal length which is double? For a regular laser beam colimated to infinity, doubling the diameter of the beam reduces the divergence by half, is this the same for the incoherent light from a LEP too?
Hi bros, do you reckon 1k lumens LEP single head is possible? Don’t have to be ultra high cd. Just 1-2 mil cd range is fine.
The Nextorch T20L is 900+ lumens.
And welcome back, haven't seen you for a long time :)
Thanks man, will check it out.
The Nextorch T20L looks interesting, but 20 watts of laser source ought to produce far more lumen than that, maybe their claim of 20 watts is wall plug efficiency, so to speak. Lots of Chinese are selling "20 watt" lasers on ebay but they are not telling you the output power, but instead a rough number for the input power which to me is a very dishonest misrepresentation, because we don't look for the wall plug power when shopping for lasers, only the output. The NUBM44 laser diode is a 6 watt rated output diode which can be pushed to about 7 to 8 watts output, that is likely what they are using in it, or a newer version of that diode at 8 watts.
Edit: Although I am new to researching LEP flashlights, from what I gather so far, if using a reflector/mirror target with the laser diode the output in lumens is close to 125 lm per watt of laser diode pumping, if the phosphor is the through type, where it is back pumped from the laser, the output is about 20 percent less per watt of laser power. In either case, a 20 watt pump laser should be able to produce more than 2000 lumen, if the phosphor could take it. I am not sure if using the word pump is appropriate for this application or not, maybe someone can help me with that as well as my estimate of lumen per watt of laser power..
The module in the link is one of those reflector type. I imagine they are not the best for torch applications since the tiny reflector will likely show in the projected image of the phosphor.
I received a module recently. Out of curiosity I used a welding mask to look at the phosphor while in operation. I was a little surprised at the hotspot at lower currents. I don’t know if this is a function of the laser beam or something else…?? I took a few pics so you guys can understand what i mean…
I think that at lower currents there is less excitation of the phosphor. how about focusing then defocus the laser for spot to flood.
I haven’t tried to open it for a couple of reasons. One I think it’s glued / a sealed unit and two I’m not real keen on playing around with a naked class 3b laser beam.
The "hotspot" on the Phosphor seems normal I think. Laser diode's have a much smaller emission surface compared to even a small power LED. The laser radiation is isotropically scattered in the Phosphor, but still you get a very small bright spot.
You can compare your picture's with the ones here. It seems very similar (notice the comments regarding the colored arrows; it's in German).
Is the beam from the laser not focused to a fine point upon the phosphor, but instead a spot is used like from a laser pointer output collimated to infinity producing a non-converging 3 mm spot? There are just some very basic things I am trying to understand about LEP flashings which I'm failing to find through google searches.
