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Thread: New project for disruptive rgb laser module!

  1. #1
    Join Date
    May 2014
    Location
    Barcelona, Spain
    Posts
    439

    Default New project for disruptive rgb laser module!

    15mm thick Brass optical plate ready for a new project

    The challenge:
    -To build the highest performance high power RGB laser module out there
    -To build the best beam quality possible
    -To achieve a low divergence
    -To achieve a high energy density to get crisp/bright beams
    -To get super-stable system free from re-align
    -To have a diode host easy to remove for diode replacement
    -With module power upgrade
    -With active TEC cooling

    ALL the above into less than iPad Air surface.

    How?
    -Performance: We fried our mind to get an optical layout for cylindrical correction ALL diodes. Done!
    Loss on cyls is about -2%. Loss on prism pair (competitors) is usually >-10-15%. So at the end we get more from each Laser diode.

    -Beam quality: Unit comes with on-board RGB spatial filter with HQ achromatic lens (under demand).

    -Low divergence: Real 0,8mrad ALL wavelengths. 6mm beam. Matched divergence: Better colour rendering @all distances.
    No, we don't just match beam size out of the unit, we take our time to match divergence for solid RGB overlap.

    -High energy density: No prism pairs, i.e. no gaps between beams due expansion. Cyls loss is not dependant on the expansion degree, so we can achieve 0,8mrad with no gaps. Low FL special collimators to achieve this.

    -Higher stability due thick brass plate and one-bolt mounts. No need to realign if the unit is treated with care.

    -Diode host: New design for a precise centering/rotation of laser diode=less beam aberrations. Also host is removable from TOP with just 2x M3 screws.

    -Power: (same plate): 8W, 12W, 16W 20W RGB. Upgradable.

    Max raw diode power: 6W 638nm, 6,5W 520nm, 12W 465nm (or 450nm): Total max RGB RAW power: 24W.

    What 0,8mrad means:

    Lets compare our RGB 20W @0,8mrad vs a 35W RGB Projector @1,2mrad typical:

    AFTER 20meters:

    Our 20W module: beam size 22mm: Energy density: 52,6mW/mm2
    35W projector: Beam size: 30mm: Energy density: 49,5mW/mm2

    So energy density after 20m is almost the same but beam in our module is 2/3 the size vs. the 35W unit.
    Same energy density into less area surface simply means Brighter Beams.

    So yes, our 20W beams look better than a 35W unit because of Thinner-brighter beams, which in fact is what matters in real world.

    This is to prove how divergence is important to get the most from the raw laser diode power. And because $ is power dependant this also means you get the most from you paid for.
    So before paying huge amounts for High Wattage, keep also in mind divergence as an essential variable.
    Less power Projector with good divergence is going to perform better than a high $ Wattage unit with higher divergence in most cases (depending of many variables of course)-

    More advances soon!! Stay tuned!

    Click image for larger version. 

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    Last edited by jors; 05-09-2018 at 13:05.
    Jordi Luque


    AtenLaser.com
    Barcelona

    "Let there be light"

  2. #2
    Join Date
    Mar 2008
    Location
    Ireland
    Posts
    184

    Default

    I can see this project generating great interest Jors, that brass plate looks like it's going to be a very busy place!

  3. #3
    Join Date
    May 2014
    Location
    Barcelona, Spain
    Posts
    439

    Default

    Sure! haha thanks
    Quote Originally Posted by helium View Post
    I can see this project generating great interest Jors, that brass plate looks like it's going to be a very busy place!

  4. #4
    Join Date
    Sep 2006
    Location
    Netherlands
    Posts
    1,435

    Default

    May I ask why you have chosen brass as a baseplate material ?
    Its thermal expansion coefficient is only slightly lower than aluminium. (steel is much lower in that respect)

    Brass conducts heat twice as bad as aluminium.
    If you really plan to build these powers you will have to conduct 16 to 40Watts through the base plate.
    Meaning you will have a temperature-gradient twice as big, (all other thing being equal).

    I advise you not to combine steel bolts with brass, because of bi-metallic effects.
    Also try to match the thermal expansion coefficient of the lens retainer to the diode mount.

  5. #5
    Join Date
    May 2014
    Location
    Barcelona, Spain
    Posts
    439

    Default

    Thanks for comments and advice Bart,
    We're going to try with alu as well and test both units. We expect better results on brass however.

  6. #6
    Join Date
    May 2014
    Location
    Barcelona, Spain
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    Default

    We did it!
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    Last edited by jors; 04-20-2018 at 02:05.
    Jordi Luque


    AtenLaser.com
    Barcelona

    "Let there be light"

  7. #7
    Join Date
    Dec 2007
    Location
    Nottingham, UK
    Posts
    2,845

    Default

    Great work !
    - There is no such word as "can't" -
    - 60% of the time it works every time -

  8. #8
    Join Date
    Feb 2007
    Location
    Fort Mill, SC USA
    Posts
    1,507

    Default

    That optical plate is sexy beyond words! Damn fine work!

    -David
    "Help, help, I'm being repressed!"

  9. #9
    Join Date
    Dec 2007
    Location
    Denmark
    Posts
    115

    Default

    Nice work.

    Who many hours did it talk to add all in and do all the allignment before you had this running ? (i mean without the development and milling work. Just adding parts in and get all aligned in place).

  10. #10
    Join Date
    May 2014
    Location
    Barcelona, Spain
    Posts
    439

    Default

    Thanks for kind words guys!!
    Having all diodes centered to collis (one by one) and glued optics, and drivers wired it took one loooong day to align all. Hard work however!

    Quote Originally Posted by Laserpower View Post
    Nice work.

    Who many hours did it talk to add all in and do all the allignment before you had this running ? (i mean without the development and milling work. Just adding parts in and get all aligned in place).
    Jordi Luque


    AtenLaser.com
    Barcelona

    "Let there be light"

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