Yes...Go with Cylinderical lenses...for ALL diode astigmatic correction !!! If you can arrange it so the beam path is of equal length....for the blue and green propagation....as it travels from the collimation lens to the first Plano convex Cylindrical...you can use only one (1) single set of cylindrical lenses...when using the NUBM07E and the NUBM01T diode !
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I have done this...and it works a trick !! The geometry of the die must be very similar on these two diodes....because....the separation distance between the cylindrical plano convex and plano concave is exactly the same for optimal correction...so....one set of Cylindricals works !! These diodes have plenty of photons out the front end....more blue than you will need...but...that is ok !!...The color of this combination ...IMNSHO....is very, very nice !!
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And yes...to giving yourself the ability for adjustment. Adjustability is a good/bad thing....Good for as close to perfect optical alignment...but...Bad....because....that which has the ability to be adjusted....then also has the ability to be knocked out of alignment....Sigh !! Optics are a harsh Task Master !
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Interesting on the RTV adhesive use....does RTV adhere well to Brass also ? I assume it does !!
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Good luck !!! Great to see another brave soul build their own rig !! The true value lies within the hands-on teaching this generates....and the eventual pride of creation !!! Keep us posted !!
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Note: Just use a Dichro to combine the Blue and Green first....then put the combined beam thru one set of Cylindricals....then...add the Red last....for the Red line is going to be your least amount of optical power....so....IIRC...the least powerful....should go last....for in that fashion the least powerful goes thru the least amount of optics....so....suffers less optical loss !
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The Blue and Green units would be side by side....as in your first drawing showing the side by side Red's....just off-set to each other so as to equalize the beam path length.......then one color needs to take a 90 degree bounce...and both Blue and Green then hit the dichro...combine....and then on to the C-lenses !!
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Oh...I still remain of the opinion that the 2mm EFL collimation lens is preferred as a lens to use on the Oclarro 63193 LD's.....and yes...the Red's stay side by side....also with an offset to equalize beam path travel...and do keep the steering/bounce mirror to align / overlay the beams in the PBS cube !!
Last edited by CDBEAM; 01-15-2016 at 20:55.
Reason: Added note
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 !