Thanks for the distances. I think the bases I have will be too short! I'm still waiting on all my components so can't really help I'm afraid.
I'll give updates once everything is here.
Thanks for the distances. I think the bases I have will be too short! I'm still waiting on all my components so can't really help I'm afraid.
I'll give updates once everything is here.
I haven't posted on these diodes for some time and owe an analysis of max power with the P73 cooled (as well as a video re spatial filtering). In the meantime, I will say that I have been disappointed with the divergence performance of the P73 vs G71 diodes. With the G71's, operated as a quad, a near field of 4x4mm and VERY careful co-alignment 1.2mrad x 0.8mrad is possible. Using the same optics, and with the P73, even as a single diode 1.8mm x 1.0mrad is the best I can do. It is proportional, but with the much higher cost and the hassle of handling the open diode, I prefer the G71's.
lens spacing is around 20mm between the cyl lenses.
The first lens needs to be ~50-55mm away from the 2mm lens
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Thanks for the dimensions Dave. Nice smooth group-buy you did there. Cheers :]
Planters: I thought it was just me but I seem to remember getting better results with the G71 too.
Eric...it ALL depends on what you can live with on the nearfield geometry !! I get 4.3mm in the NF @ under 1mR divergence on the P73's I've tested...To me...they perform on par with the G71's....Of course....Methods vary for taking a measurement !! My farfield measurement is a 45' (11.5M )....perhaps that is not far enough ???...For my $$....the P73 is good to go !! BEAM OUT
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 !
Hey Bob,
Are you using the newest setup from Dave's GB or something else now to acheive these specs? (I haven't had a chance to try Dave's newest cyl lenses yet) + the 2mmfl lens still?
Hey Steve....Still using the ill-fated GB 6X from Kiyoukan. After this latest discussion....I went back and re-measured many times....Well...OK 4.6mm at the nearfield with about .73 mRad at the farfield. Since my ultimate goal is build Projector #2....I will be getting the biggest mirrors I can on the new scanners. I can always move the correction optics away from the 2mm Colli lens to reduce the nearfield to fit on the scanner mirrors. Engineering always involves trade-offs !!
I've assembled a dual using the P-73's. Challenging to get it all aligned....A quad will be even more fun....but PBS'ing is more forgiving !!
Have Fun !! BEAM OUT
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 !