suppose you're thinkin' about a plate o' shrimp. Suddenly someone'll say, like, plate, or shrimp, or plate o' shrimp out of the blue, no explanation. No point in lookin' for one, either. It's all part of a cosmic unconciousness.
Yikes squared !!! SD...you said you are using...."aixiz blue lenses and prisms/cube from the group buy p1t8ull did last year".
OK...3mm at 40 feet ???????. 12mm x 3mm ??? where is the FA magnification from the prisms ??? Anyone else who really understands optics....please jump in here....for I am clearly confused....and perhaps out of focus too !!
CDBEAM
Another question...I assume your beam pic is the geometry at 40 feet ????????? I do not understand !!! That beam geometry....while a great looking circle....is approx 40mm in diameter....when compared to the wall plug plate just to the right of the spot...and is at the same termination plane distance. ??? What am I missing here ???
Yikes again....I am looking at your front prism.....on the normally placed set.....an it does not look like the normal " Zoof Templete "...??? Just trying to understand optics....my most challenging area !!!
Last edited by CDBEAM; 09-21-2011 at 19:07. Reason: Added last question
Beam Axiom #1 ~The Quantum well is DEEP ! Photons for ALL !!
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Beam Axiom #2 ~Yes...As a matter of fact...I DO wear tinfoil on my head !!
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Beam Axiom #3 ~Whe'n dout...Po ah Donk awn et !!
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Beam Axiom #4 ~A Chicken in every Pot, and a Laser Lumia in every Livingroom !!
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Beam Axiom #5 ~"Abstract Photonic Expressionism"....is "Abstractonimical" !!
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Beam Axiom #6 ~ "A Posse ad Essea" ~ From being possible to being actual ...is the beam target !
Wiki:The first visible wavelength laser diode was demonstrated by Nick Holonyak, Jr. in 1962.
FS: hi grade SEAL DUST
Where did you purchase your PBS? I am not familiar with JML
Thank YOU
CToyz...JML is in Rochester NY. They are very pleasant to deal with. See: www.jml@jmloptical.com
under beam splitter, part # CPO21361 @ $ 105.00 Not cheap....but 98% transmission and 95% reflectance. Perhaps there is better
out there....at several times the cost ??? Dunno. Perfect for 445nm beam combining and it looks coated.
CDBEAM
Beam Axiom #1 ~The Quantum well is DEEP ! Photons for ALL !!
.
Beam Axiom #2 ~Yes...As a matter of fact...I DO wear tinfoil on my head !!
.
Beam Axiom #3 ~Whe'n dout...Po ah Donk awn et !!
.
Beam Axiom #4 ~A Chicken in every Pot, and a Laser Lumia in every Livingroom !!
.
Beam Axiom #5 ~"Abstract Photonic Expressionism"....is "Abstractonimical" !!
.
Beam Axiom #6 ~ "A Posse ad Essea" ~ From being possible to being actual ...is the beam target !
I am looking at mounting the prism pair and see two methods in this thread. I want to avoid over-engineering while building a good, stable and easy to dial in mount. I could any advice on the merits and tricks.
Here is my setup. Wave Plate and PBX before the Prism Pair. The trick is setting the Prism Pair at a pretty extreme angle which is well past Brewsters Angle, which results in high losses but a well corrected beam. There is so much bloody power who cares about the losses... I'm getting 1.4 Watts at 1 amp. The beam is 8mm at 30 feet.
1.2 Watt RGB Build
DHOM 300mw 532
DHOM 600mw 445
Laserwave 300mw 640
DT-40 Pro's
FB3 / Quickshow
Mr.P....If you are asking on how to mount a pair of A-Prisms...
This is how I have done it...the anamorphic prisms are positioned and mounted/clamped with two (2) acrylic plates which are joined with four 6-32 allen head bolts. A 2mm rubber grommet is placed atop each prism to cushion the prism from unequal downward pressure ( Small black circle ). Basically...one is making a sandwhich !!! When the top plate bolts are tightened...the grommet compresses and clamps the prism into position. Thus...adjustments are always doable down the line. There are four (4) additional mount holes in each plate which provide for securing the entire module to your optical platform.
As to what angle to position the first prism....Brewster ( About 57 Degree ) or more severe as mentioned by LK....well....we are " Between the Devil and the Deep Blue Sea " in this selection !!! At the Brewster angle....minimum transmission loss....BUT...Not maximum beam correction....a more severe incidence angle....more beam correction...but more transmission loss.
Actually....now that I have been experimenting with the Drlava Cylinderical lens set up...with the ultra low transmission loss ( about 3%) with red LD's...I am going to experiment with the
C-Lenses and the 445LD... Perhaps that will also be a better way to go than prisms. I hate " waste " beams generated by the prism set up....well....they are a waste !!!!
Likely others have already done experiments....but I have not seen any posts on this topic. Seems as though everyone ( including me ) have settled on prisms as the #1 method for 445LD beam correction. Perhaps the Good Doctor was WAY ahead of the curve.... Anyone else have improved results with C-Lenses on the 445 ??? Sorry if I did a small thread jack !!!
BEAM
Last edited by CDBEAM; 10-24-2011 at 20:59.
Beam Axiom #1 ~The Quantum well is DEEP ! Photons for ALL !!
.
Beam Axiom #2 ~Yes...As a matter of fact...I DO wear tinfoil on my head !!
.
Beam Axiom #3 ~Whe'n dout...Po ah Donk awn et !!
.
Beam Axiom #4 ~A Chicken in every Pot, and a Laser Lumia in every Livingroom !!
.
Beam Axiom #5 ~"Abstract Photonic Expressionism"....is "Abstractonimical" !!
.
Beam Axiom #6 ~ "A Posse ad Essea" ~ From being possible to being actual ...is the beam target !
CDBEAM,
Thanks for the advise and this how I will go. Incidentally, did you machine the hard spacing between the plates for zero clearance and then with the pads just back off slightly on the retaining screws? I am expanding six 445 diodes at once and will be limited by the prism's clear aperture to slightly less than a 2:1 expansion. That's OK as that in turn is the max my scanner will handle. The problem with the cylinders is that only one of the diode beams can be on axis at a time and the others that are off axis will suffer from progressively greater and greater coma the farther they are off axis. So, to minimize this you can correct two independently and then PBS, but then beyond this you will have to correct and then knife edge or have to accept this aberration. This can get pricy.
Laserkits,
I am assuming that you glued the pair down and this is tempting (so simple), but how time consuming was the alignment process. Was this easy; as in align the diodes to the smallest far field spot then insert the prisms and move one or both/back and forth a little? Any special order as you dial it in?