New Diode

[planters]

Jors,

Thanks for the construction plans. I think I know a company in China that can supply the crystal. I think Steve once referenced some company(Russia?) that could. The only glitch is the description states the ROC of the mirrors are 100mm and 150mm, but the diagram shows one mirror as flat. Everyone will want to run the orange line, but the crystal self absorbs a few percent of this line causing heating, thermal lensing and limiting the power to several hundred mW to a watt.

[andy_con]

if only you could get hold of Pr:YLF's

Those diodes could be great candidates for Pr:YLF pumping!
Attachment 47590

[CDBEAM]

150 bucks can get you possibly 8-10 watts?? CDBeam you still sell those corrective optics don't you?

No...I do not sell optics...just tinker with them !!! Now...I am thinking the NUBM44 will be corrected with Anamorphic prisms !! Just my speculation as I do not have the LD yet to experiment. While this will cause higher optics loss....like 3% vs. 1%...IIRC...oh well....will report as soon as I can...and yes....IF this is 462nm....outa the park home run !!! we'll see !!! Not this much excitement since the high power 520's....and B4 that the " Holy Grail" stir !!!

[jors]

Andy, Eric, I contacted a few companies for Pr:YLF several months ago, rods and slabs.
Have some quotations but is really expensive... If any brave wants to experiment pm me, Happy to share my sources

if only you could get hold of Pr:YLF's

[andy_con]

Andy, Eric, I contacted a few companies for Pr:YLF several months ago, rods and slabs.
Have some quotations but is really expensive... If any brave wants to experiment pm me, Happy to share my sources

Just post a price here, I'm sure I won't be able to afford it

[planters]

I am thinking the NUBM44 will be corrected with Anamorphic prisms !!

You can if you want, but I have much better success with a lens pair. As long as they are stacked so that the beams are axial and not lateral to each other in the cylinder then the cylinder pair will give lower losses and lower divergence. But they must be axial!

Jors,
PM me with the reference. I think a rod would be interesting only as a little experiment. The answer for real power would probably be a slab. This can be pumped from above with little regard to tight beams and easy washing of the entire side surface just as in VDX's photo. The cavity can zigzag tangential to the pump direction. The slab sits on an indium film interface to a copper heat sink.

[catalanjo]

... When fokussing a 445nm-diode with 15-20mm FL, the focus diameter is as small as 0.05 to 0.03mm, what would easy 'fit' into a 0.05mm fiber - could give pretty good results with the totally circular 'homogenized' output beam ;-)Viktor

I know it's a tad "offtopic" but since visible lambda fibres have cropped up again
Viktor you don't happen to know of a source for 50 micron high power (visible wavelength) delivery fibres ............................ in very small or "one off" quantities do you?
I have to fix an old Argon Ziess retinal surgery setup but can't find suitable replacement delivery fibre!
Cheers

[jors]

Custom Boule Growth: $7500
Polish 1pc 4x4x1: $1000
AR coating on each 4x4 surface: $3000

The boule is approximately 25mm diameter x 90mm lenght

other provider:
0.5% Pr:YLF Single Crystal
5mm x 5mm
Thickness: 2mm
Both Faces Polished: 10/5 S/D
Both Sides AR Coated @444nm (R<0.25%)
Qty 2: $1199 each

Just post a price here, I'm sure I won't be able to afford it

[catalanjo]

Great! if you have a couple lying around...I have the Copper slab and Indium sheet ..so let's do it!
Cheers
PS. That AR coating looks a tad pricey!

[jors]

Eric, yes slab is the way to go for reasonable powers. Rod suffers from hot spots due pumping, so bad optical homogeneity...bad beam profile/high looses.. or even not lasing at all. Even more, YLF have worse heat conductivity than YAG. what about a ziz-zag water cooled slab (longitudinally,side, pumped)..say two YLF slabs?
pm sent

You can if you want, but I have much better success with a lens pair. As long as they are stacked so that the beams are axial and not lateral to each other in the cylinder then the cylinder pair will give lower losses and lower divergence. But they must be axial!

Jors,
PM me with the reference. I think a rod would be interesting only as a little experiment. The answer for real power would probably be a slab. This can be pumped from above with little regard to tight beams and easy washing of the entire side surface just as in VDX's photo. The cavity can zigzag tangential to the pump direction. The slab sits on an indium film interface to a copper heat sink.