Mitsubishi ML520G71...Red Holy Grail or Flashlight Fail ??

[CDBEAM]

Good job Mr.B !! I will be satisified if we can equal the beam geometry of the corrected 445 !!!! Please provide details when you can !!! Looking alittle more like a Grail....than a Fail !!!

BEAM

[LaNeK779]

Looking alittle more like a Grail....than a Fail !!!

let's call it a Frail for the time being then
I could settle for this, i could also settle for 7mm galvo mirrors

wish i could afford eyemagics right now...

[RGB LASER VERKOOP]

DT has also nice fast galvo's with bigger mirrors!
TIP

[LaNeK779]

DT has also nice fast galvo's with bigger mirrors!
TIP

thanks for the tip joost
I have a set of DT25 with big mirrors, and i am also familiar with DT30 and DT40 pro/wide

i just wish for eyemagics. a man can dream...

[Laser66]

Badger:

what lens did you use for short FL?
I see the 405-G-1/ 405-G-2 have been used but not too successfuly. I doubt our 650-G-2 will be any better, as it's just 0.55 NA compared to higher NA for 405-G series.
I doubt it's the A coating of the 405-G series, but the 650-G-2 has a "red" B coating.
650-G-2: BFL= 2.9mm, 6mm diameter.

the lava lens is the trick along with very short fl lens will pass on the full details when i finish testing, dont want people buying a load of stuff
and blaming me because they cant get it to work,
all i will say is i can match what andy's getting, its just a pain to setup and you need paitents doin it , but results are worth it
430mw of 638nm @ 1.1mrad = for me

andy hope you find that lens the boys will be baying for a GB

[badger1666]

@ laser66
all i will say at the moment is that its very short <4mm a bit of a bitch to get lined up dead center.
i will let you all know the source when i get time to finish testing, want to make deffo sure its the right choice first
results in mid week i hope

[LaNeK779]

i must be missing something major here...

my way to think about this is that the shorter the fl of the asphere, the bigger divergence the cyl lenses have to correct... and dr lava's prisms didn;t seem to have the magnification power necessary.

what am i missing? does the distance of the diode tothe first lens play such a major part?

[badger1666]

hey lanek dont go getting you knickers in a twist thinking about it, lava lens seem to work better at a short fl, dont ask why ,i dont know.
it just works, the beam aint super pretty yet but its nice and small but i am working on getting it right

i must be missing something major here...

my way to think about this is that the shorter the fl of the asphere, the bigger divergence the cyl lenses have to correct... and dr lava's prisms didn;t seem to have the magnification power necessary.

what am i missing? does the distance of the diode tothe first lens play such a major part?

[planters]

Yes it does. If the first lens is set up to produce a large parallel beam or a small diverging beam, it is the diameter of the beam that exits the correction optics that governs the divergence ( bad lenses or misalignment aside for the moment). The size of the beam incident on the corrective lens determines its F/ratio even when the focal length of the lens is fixed. Dr lava's optics are lenses not prisms and if the beam from the collimator is divergent when it strikes the neg. cylinder then the second and positive cylinder will have to be spaced farther away from the first lens creating a higher magnification telescope.

[LaNeK779]

hey lanek dont go getting you knickers in a twist thinking about it, lava lens seem to work better at a short fl, dont ask why ,i dont know. it just works,

well, i could get them in a twist or even tie them in a knot and still don't have a clue of what is happening
but you can believe me whan i say that i don't really care about the physics behind it, i just want it to work!

mr planters's explanation sheds some light of course, i thought that cylinde lenses worked like normal pcx and pcv lenses where (i.e. that the distance between them was fixed)

it seems that we are getting closer and closer. maybe this adjustable mount from logsquared should come in handy in terms of centering the diode

and chris, your experiment shows that it is highly possible that andyf's "mystery optic is most probably a short FL asphere and not some sort of exotic acylindric or grin lens