Senior Member
That's looking cool but As I understand you are also selling these? isn't that kind of advertising when you don't show inside the box?
This thread is for the development of the diode systems for all and am sure it would benefit all to show how you done it if even if there are no secrets to using pbs and prisms.
Anyway, its looking nice.
Senior Member
Oh yes, forget about all the unspoken rules here;-)
i just want to share some news with friends on this forum.
this one is not for sale! it is the first so i think i am ok here:-P
i want to put video and pictures on my website, not here sind the feedback is never positive
laser joost greets
Senior Member
Without actual beam data, profile pictures, drive currents and so on, the term “good beam” is just an opinion that has not been reached with prisms.Originally Posted by RGB LASER VERKOOP
Senior Member
It is confusing, but basically the two things to remember are that the fast and slow axis are defined pre-collimation, and the diameter/divergence proportional shift always applies.
Look at a G71 raw diode output shape on a wall, with the case pin north or south you'll have a "|" shape, so this is fast axis vertical and slow horizontal.
Add a single collimator to bring the fast axis into check, and the near-field beam shape is now say, 1mm wide by 2mm tall.
Because the near field vertical dimension is larger, the divergence is lower resulting in a smaller vertical dimension far-field.
Because the near field horizontal dimension is smaller, the divergence is higher and this results in a wider horizontal dimension far-field, but it is still the slow axis.
After collimation (and with no correction) the point along the beam path where the spot shape becomes very close to circular is where the two axis cross over.
A little bit werrrr, a little bit weyyyyyy, a little bit arrrrgggghhh
el gringo loco
...I see ol' LASER VERPUTZ is at it again..
Anyhoo..Gents - *fantastic* werk, on all of this, and I've been thinking about this, in-relation to the 445s, this past week, as Sir Chad and I are working on some 'similar issues' with the Blues... just needing to find a better-way to tame the FA and get more-power 'compressed' / passable, w/O sacrificing divergence.. and I was thinking just this - perhaps a small C in-front of each collim, between the knifer.. the werk you guys have done on this both really-fantastic and 'germinating'...
Keep up the good werk, fellas...
Sire -
... discussion-moved..
Last edited by dsli_jon; 03-24-2012 at 22:49.
....and armed only with his trusty 21 Zorgawatt KTiOPO4...
Senior Member
Pretty sure I have it right, but happy to stand corrected as well
Yes, of the emitter, before any collimation or correction. After a single collimator the beam spot shape appears to flip 90 degrees from 'l' to '-', but that does not mean the FA is now horizontal, just that collimation has left us with a usable fast axis and a slow axis that needs expansion to reduce divergence..
See if you can render up some grafix that may visually explain what's goin on, be good to clear up this confusing topic and add the info into the PL wiki
A little bit werrrr, a little bit weyyyyyy, a little bit arrrrgggghhh
Senior Member
A member build this for me and the specs are:
6 diode red at 400mW/diode:
optima lenses with PBS cube, 4X telescope, 2 sets of prisms, ~3.3mm X 3.3mm ~1.4mRad both directions.
with dave lenses. nice beamshow laser.
Senior Member
I think the terminology is important, note the wasted time regarding the knife edging a few posts ago. But understanding the physical process is even more important. Seee my post # 1097.
Jon,
I think you are describing the core of what will ultamately be a successful and substantial improvement in beam combining. A seperate and single cylinder in front of each diode will allow the freedom to adjust the focus point of each subsequent added beam and so open up the possibility to add MANY additional diodes! However there is a very important question to answer... Will kiyoukan's atempt to add just the first two work as well as the theory suggests it will? From there its all just a simple matter of expension/refinement.
Like with the previous collimator search this is so important that it might be helpful for a few parrallel atempts to be made by others.
I'm thinking what is the optimal first cylinder perscription/spacing?
How to adjust the positon and orientation of this lens
A simple(cheep) tip/tilt,X andY mirror mount. How precise is needed?
I for one will be getting into this in a big way.
P.S. this hotel comp. is killing me!
Senior Member
hmm pbs cube, a 4x telescope and prisms and only losing 400mw over all , finding that difficult to belive ??
your only loss is 66mw per diode, i would like to know more about that setup please
that would benefit the community greatly to find out how you got such a small loss
nice case on that laser too.
When God said “Let there be light” he surely must have meant perfectly coherent light.
Senior Member
i lose more, output after all optics, ar glass, scanners, front window is 1,77W
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