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NEWS...Red FAC TAMED.....Red FAC + G8 + 6X Set Cylindrical lenses = @ 13 M =====> 7mm x 7mm Beam Geometry ! This equates to a 0.4 mRad.....0.4mRad.....Really.....so, some ghost aberration....above and below the spot geometry....nothing that cannot be masked out. See pics. Must measure the PO...

Group Buy List as on 1.20.2020 CDBEAM 10 Paul1598419 1 RedCowboy 5 Trinh Hong Phuoc 3 Icecruncher 2 Light Superglue 10 Absolute 2 Bowtieguy 1 Parona85...

MMM …. Infinite Conjugation THAT is what we want....as close to it as possible. I have not measured the Rayleigh Length. Will study this. Each lesson in Optics is a fight to understand when one is missing formal training....Possible...but hard earned....driven by passion and unending...

HAHAHAHAHA I can Google too....See my Hero....The Great Gazoo !!!!!

" Far Far field "....good way to describe it....at least we have a common language in our HH world. I doubt that the Optical Engineers would agree. They are so demanding !! HAHA...Later, CDBeam

OK....On to what this Hack is now doing with the Blue FAC. Achieved a mRad of 0.75. Beam geometry at 13M / 12mm x 10mm. Very minor vertical and horizontal spill. Set-up @ NUBM08 FAC+ G8 + 6X Cylindrical lens pair. PCV/PCX placement is...er....demanding. On to tame the Red....IF possible...

Well....Thanx Steve001......I have no formal training in Optics but am always very eager to learn and learn !! SO....Far Field is when the beam geometry is 1.4 times the initial LD diameter. OK...good to learn the proper definition ! To me....that is not really to far.... SO...Most of out...

Yea...Projector Application demands small Near Field....But HH do not demand this !!! BTY...I continue to experiment with these FAC units....Maybe I will get to the Red FAC tonight. And....well...yes...a single convex 50mm diameter Long EFL will focus the divergent beam down to a smaller...

Nice work RC ! Is there a Colli on the rig ??? Well...The 75mm...is not long enough FL !! As one continues to move the lens back....the Mid Field spot is reducing...but, I ran out of room !! I could Not move the lens back any further...without out masking the beam...Maybe a 100 EFL or 150...

Well...For sure...The C-lens Optics...When combined with a G8 and the Blue FAC....well....I can get the geometry down to a 1.25 mRad....BUT....The Geometry of the Mid Field Beam, say @ 14M....is a compact " S " shaped....and I am still trying to correct this !!! I should add that I truly...

Ye...I will do that shortly !!! CDBeam

LS...OK....I tried various 75mmEFL positions...10mm from the LD output....to 150mm distance...The LD had a G8 Colli lens attached when the test was made. Up and down the C/L....ALL CRAP!!! Least geometry achieved was about 100mm Square @ 14M Distance To Target. The beam output from the G8 fit...

Thank you all for your contributions !!! It will take me some time to understand them all !!! SO....I read...and struggle to understand....Sometimes...briefly...I think I do understand....then , I am grounded and humbled. again...So it goes. SO...I tried a 12.5mm dia / 75mm EFL Convex lens...

AA ...Will try this !!! Thanx !! I have just the lens in mind. CDB

MMMmmmm ???? Define Far Field...is that 15M....or 150M....or other ??? My FF is 14M... IMNSHO...after that...to some degree...Parallax View presides. CDB

I assure you all....THIS FAC development has my hair on fire !!!. I had dreams of a simple alternative to C-Lenses....Well....Sigh.....Not so quick !!!!! The Green FAC is OK with a 3E....1.25 mRad.....could be better. Divergence is comparable to DPSS divergence.....BUT....the 525 nm line is...

Good luck Chris....It may be possible to Micro position with a minimal featured manipulator....but yes....How the Hell do ya fix the Fibre ??? HMMMmmm ???????????????? Another Micro Manipulator with a micro syringe...standing by to fix the Fibre Optic....DUNNO ????...SO...now we have 2 x...

Ya know...There is ONE....in every crowd !!!! HAHAHAHA.....Unicorn my ____ !! Well...We struggle....and I am used to looking....well....Challenged !!! But...I just do not care.... I will attempt to use the correct nomenclature....just to be accurate in my sharing and gathering of...

This is a GREAT thread !! I am very glad to be a participant....and LEARN. I have NO formal Optical Training....but...I have worked to understand the fundamentals....and produce results...for years. I have shared my journeys....and always attempt to remain humble in my general...