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Thread: 445nm specific PBS cube GB

  1. #31
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    swamidog is offline Jr. Woodchuckington Janitor III, Esq.
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    that's a valid point. you may inadvertently rotate the polarization when bouncing the beam into cube alignment. a wave plate would be handy to correct for that.

    Quote Originally Posted by dsli_jon View Post
    ..I think the other-concern with the 'cubiplate-combo' is rotational-range limitation.. not much you can do, if one/two of a multi-watt knifed-input is a nano-tweek off, (...and yer already rotated as far as you can-go, to be dialed-in the best you can on yer prism-knives.) w/o killing the others' efficiency, or possibly murdering the other axis.. Still, might be an interesting cube to test for 'lower-risk' builds, ie: a 4-up'er... ...



    ..I believe this laser can be 'heard' at 2:44-2:45 http://www.youtube.com/watch?v=WKt2Y83njlk, amirite?
    nice werk, Mr C...

    ..So, Dave - are we at 50, yet? Keep us posted, and me on that larger 1/2-wave - *NEED*..

    cheers..
    j
    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.

  2. #32
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    Perhaps I am confused on how waveplates work, but I thought that the amount of polarization rotation was determined by the thickness of the cystal in the waveplate, and such is not adjustable. Adjusting the rotating is what I think is being refered to but maybe some other adjust is needed. Can someone correct my error if I am confused on this?

  3. #33
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    Quote Originally Posted by zetist View Post
    ...I thought that the amount of polarization rotation was determined by the thickness..
    Waveplates, demystified - Simple-version (..scoot down the page a bit for the info / diag's..):
    http://www.redoptronics.com/waveplate.html

    ..Gory-version..
    http://en.wikipedia.org/wiki/Waveplate

    ..also, found this, too: http://optics.byu.edu/animation/polarwav.mov ..simple anims, but nice..

    ..so, basically, the 'cubiplate' would be tricky for multi-up diode arrays, where simply 'rotating' the diodes (vs the 'cubiplate', since any rotation to 'peak' the thruput on the plate-side axis, would begin to send the perpendicular-axis thruput straight to the devil.. ) is not as-desireable / efficient vs simply having an 'independent' waveplate, in it's own rotatable-mount.. Diggin it?

    ..still, cool-find, and an interesting optic for some-apps...
    j
    Last edited by dsli_jon; 03-23-2013 at 12:21.
    ....and armed only with his trusty 21 Zorgawatt KTiOPO4...

  4. #34
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    Dave: 10pcs
    LaNeK: 2pcs
    Kovacika: 2pcs
    Bradfo69: 1pcs
    dsli_jon: 4pcs
    danielbriggs: 2pcs
    Insanity: 2pcs?
    zetist: 16pcs
    buffo: 2pcs


    Getting close!
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  5. #35
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    Go ahead and put me down for 2

  6. #36
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    Dave: 10pcs
    LaNeK: 2pcs
    Kovacika: 2pcs
    Bradfo69: 1pcs
    dsli_jon: 4pcs
    danielbriggs: 2pcs
    Insanity: 2pcs?
    zetist: 16pcs
    buffo: 2pcs
    hitekvoop: 2pcs

    OK, close enough.. I think I'll probably get the extras and keep them as stock.. Ill start sending some PM's out later, and see how we go
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  7. #37
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    Hey Guys,

    Just a bit of an update. I just recieved a couple of 10mm samples, and efficiency seems quite nice.. A quick test and this is what i measured:

    Reflect - in 870mw, out 855mw.
    Transmit - in 870mw, out 850mw.

    I will leave 1w of 445 pointing at the cube fore the rest of the day. Wondering if it should be a lot more than 1w.

    Dave
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  8. #38
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    Soooo,

    I have had ~3w pointed at the pbs for the last couple of hours, no noticeable change..

    I have a second untouched cube - maybe I send it to someone to do some more tests? Any one keen?
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  9. #39
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    I can test one with 10w of 445.


    Quote Originally Posted by dave View Post
    Soooo,

    I have had ~3w pointed at the pbs for the last couple of hours, no noticeable change..

    I have a second untouched cube - maybe I send it to someone to do some more tests? Any one keen?

  10. #40
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    One cube going to Buffo, One cube going to Platinum, looking forward to my test results being verified
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