"Blue Demon" & "Green Demon" now available - 15W Blue & 4W Green Handhelds

[Deleted member 76310]

Hi everyone,

We recently heard about some exciting new tech to finally break through some power barriers for handhelds... and, of course, we managed to get our hands on it.


Behold, the Blue Demon:

(15W)


And, the Green Demon:

(4W)




I'll let the LPM reading speak for itself:

The brightness on these is simply unbelievable. At night they can light up an entire backyard, and the brightness is sufficient to make the beam visible in daylight.
These are wide-beam lasers, but do not have the divisions that lasers based on multi-diode arrays have. It Is just a single wide beam.

If you're interested:

Blue Demon: >>>HERE<<<
Green Demon: >>>HERE<<<

 

[RedCowboy]

Are these single emitters or have you combined a couple of beams into 1 inside each unit ?

 

[Gryphon]

What on earth!? I must know what's inside!

 

[RedCowboy]

I know we are waiting to get hands on a NUBC31 but a 4W green at the same time...... no I bet a pair of NUGM06's

How good is the beam ? dia. ? divergence ?
Is it still diverging faster on one axis ?

Combined by Bragg grating ?

Looks like I'm behind on my reading, this is exciting.

coherent beam combining

Coherent beam combining is a class of methods for laser beam combining, requiring mutual coherence of the combined beams. It is used for high-power laser systems.

www.rp-photonics.com

spectral beam combining

Spectral beam combining denotes a class of methods for beam combining, based on wavelength-sensitive beam combiners. It can be used for some high power lasers.

www.rp-photonics.com

Spectral vs. Coherent Beam Combining: How Do They Compare?

Partial reflectors in interferometers and polarization-sensitive devices (beam splitters used in reverse) such as beam-splitting cubes are common examples of systems that combine two beams (adding beams so that they are co-linear). While these components perform beam combining, they typically...

www.techbriefs.com

Also interesting
file:///home/eroom/Downloads/Laser%20beam%20Combining%20(1).pdf

https://lumoptica.com/file_download/6/Laser+beam+Combining.pdf

 

[Gryphon]

^Looks cool, but I don't think that would fit in that pointer. I would love to be proven wrong so I can make some monster handhelds

 

[Deleted member 76310]

Are these single emitters or have you combined a couple in each ?

These are dual diode with some interesting optics. However we are still searching for the elusive 13W 465nm diodes which, when we get them, may let us get 30+ watts out of these

I’ll do some measurements on the beam in a bit.

 

[RedCowboy]

Depends, if you can use just the substrate stacks then you can maximize your miniaturization.
But I expect he is using a new diffraction grating and a couple of existing nubm44's or nugm06's

 

[Gryphon]

These are dual diode with some interesting optics.

Is the projected spot a cross like it would be with a single PBS cube?

 

[RedCowboy]

Sure or you can use a rotator and rotate the polorization of 1 of the beams, I was doing this just recently, it's easy but I am looking at the space constraints and thinking it's maybe something newer.

Here I am combining 2 beams using a rotator and pbs cube. The combined beam looks like 1 regular beam at 2X the power.

BragGrate™ Mirror | Laser Narrowing and Stabilization

BragGrate Mirror - Reflecting Bragg Grating for diode laser wavelength locking

www.optigrate.com

 

[Gryphon]

I didn't know you could do that, that's great!

 

[paul1598419]

What kind of duty cycle do you get out of the 15 watt? The heat sinking seems a bit small, but I can't say that for sure.

 

[Deleted member 76310]

Is the projected spot a cross like it would be with a single PBS cube?

No, it’s a line, similar to most multimode diodes. Divergence has a fast and slow axis, but it’s compensated for by using a wide lens.

What kind of duty cycle do you get out of the 15 watt? The heat sinking seems a bit small, but I can't say that for sure.

The heatsink is actually pretty huge. Keep in mind that these take two 32650 cells - the laser is massive. As for the duty cycle I’ve run one for 4 minutes at a time and it didn’t get too hot; I’ll do some more comprehensive tests later.

 

[paul1598419]

Thanks. With no frame of reference it's difficult to tell how big the host is.

 

[Gryphon]

Can you take apart one of these? I would love to see the optical train

 

[Unown (WILD)]

Can you take apart one of these? I would love to see the optical train

I second this

 

[RedCowboy]

Yes if using some reverse diffraction grating or a Bragg grating to combine beams we would like to see what's involved....Also would like to know if beam correction via c-lens pairs is still possible after this new combining method.

Beam combining

The term beam combining denotes a class of techniques for power scaling of laser sources by combining the outputs of multiple sources.

www.rp-photonics.com