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Thread: Double set of galvos

  1. #11
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    Quote Originally Posted by buffo View Post
    Less chance of getting lung cancer with silicon carbide, right?

    Adam
    That, and the fact that the cost is typically an order of magnitude (or more) less per mirror!
    Sincerely,
    Ryan Smith
    ScannerMAX Mechanical Engineer
    ryan {at} scannermax.com

  2. #12
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    Default ...an old example previously posted on PLF of a quad XY head

    Yes, its been done before, this from my design ~1983-1985.


    Click image for larger version. 

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  3. #13
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    mixedgas is offline Creaky Old Award Winning Bastard Technologist
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    You performed shows with a DIE-ONICs ? You have my utmost respect... (Laser Ionics, notorious for broken gas reservoirs when traveling, but highly cost effective in use!) Not easy to change the tube, as it was glassed in through a hole in the resonator base. If I'm wrong, that is the other blue Ion Laser, made in UTAH... A whatchamacallit... I can't remember, but much better made...

    Steve
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  4. #14
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    Quote Originally Posted by mixedgas View Post
    You performed shows with a DIE-ONICs ? You have my utmost respect... (Laser Ionics, notorious for broken gas reservoirs when traveling, but highly cost effective in use!) Not easy to change the tube, as it was glassed in through a hole in the resonator base. If I'm wrong, that is the other blue Ion Laser, made in UTAH... A whatchamacallit... I can't remember, but much better made...

    Steve
    DIE-ONICs. Cute, I hadn't heard that one. No, this Laser Ionics Model 554 mixed-gas laser was for a static planetarium installation. I agree entirely on what a pain in the ass it must have been to service it. Luckily, the planetarium client bought the laser, I designed and built the 4-color, 3W projector and graphics control system around it. I don't accurately recall, but I think the tube lasted 3-4 years of 11 shows per week use. I saw the projector a few years after that and it had a Spectra Physics 164 Krypton laser head on it.
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  5. #15
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    Quote Originally Posted by dinther View Post

    Would I be correct to think that this arrangement makes it possible to double the power and double the scanning capability?
    I mean, this is essentially two show lasers that are almost originate from the same point.

    Attachment 61142
    Attachment 61141

    So many questions.
    - Has this been done before?
    - Are there better ways to do this?
    - Can 2 sets of galvos from the same manufacturing batch accurately draw the same graphic with double intensity?

    Well Hi there!😎
    Glad to see that you've come to the right place to receive the right guidance from the right old school fellow Laserists.
    Is your objective with this design to overlay 2 identical images into a single one of double intensity?
    Q: What does this design achieve that a more powerful projector wouldn't, w/o the very challenging difficulties of this design, such as maintaining perfect optical and signal alignments?
    Sure, higher powered laser projectors are a lot more expensive. But, IMO, by the time you cover the costs of double galvos, drivers, RGB modules, RGB drivers, optical plate, engineering a special dual X/Y mount, and the projector housing, ... you're going to spend far more than an OTC projector of higher power.
    That doesn't include your time and developing a custom control system, as you've mentioned.
    Consider forking out all of that $ on an idea that doesn't work reliably, after being shaken around in transport from gig to gig.
    On the other hand, a higher powered OTC projector is (hopefully) professionally designed, manufactured, tested, covered by warranty and can easily be duplicated for multiple projectors to be used on larger venues or outdoor events.
    Plus, all of the safety features, like key switches, panic buttons, and interlocks are required in many countries and are standard on most professional OTC projectors. With a bit more invested, scan fail boards can be added.
    These are all well worth considering, if you're intention is to do public gigs, with safety inspections and potentially becoming liable for eye damage to your audiences.
    Will you be competing for clients against other established reputable laser production companies, who already have these matters covered? They're not playing around with DIY projectors.
    These are my thoughts FWIW.
    I sincerely wish you lots of fun, fame, and fortune on your endeavors.
    Roj
    Last edited by TheHermit; Yesterday at 10:07.
    What goes around, comes around;
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  6. #16
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    Hi hermit, the thought crossed my mind when I read how galvos with larger mirror are not as fast as those with smaller mirrors. I understand and more powerful beams tend to have larger diameters and therefore require larger mirrors.

    Then looking inside my Lasercube 7.5 W Ultra reveals that there are actually many laser diodes for each color all brought together by a forest of dichroic mirrors.

    So, my thought was well, why not combine two laser sources at galvo level so that each galvo can work with a smaller mirror.

    But I hear you and your comments are quite valid. It's too expensive and I have started to realize that I rather have many smaller lasers than a few big ones, it was more of a thought experiment.

  7. #17
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    Quote Originally Posted by dinther View Post
    Hi hermit, the thought crossed my mind when I read how galvos with larger mirror are not as fast as those with smaller mirrors. I understand and more powerful beams tend to have larger diameters and therefore require larger mirrors.

    Then looking inside my Lasercube 7.5 W Ultra reveals that there are actually many laser diodes for each color all brought together by a forest of dichroic mirrors.
    I suggest watching zenodilodon's laser repair videos on YT. He covers aligning, cleaning, and troubleshooting many different models of commercial laser projectors, plus he demonstrates DIY builds.
    His monologue is very entertaining, as well.

    Hope this is helpful.
    BR
    Roj
    😎
    Last edited by TheHermit; Yesterday at 10:01.
    What goes around, comes around;
    We project what others reflect.

  8. #18
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    Quote Originally Posted by lasermaster1977 View Post
    Yes, its been done before, this from my design ~1983-1985.


    Click image for larger version. 

Name:	FW Museum Projector-3.jpg 
Views:	6 
Size:	1.02 MB 
ID:	61190
    Saweet & neat galvo configuration!
    How was color and beam splitting handled?
    What goes around, comes around;
    We project what others reflect.

  9. #19
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    Quote Originally Posted by TheHermit View Post
    Saweet & neat galvo configuration!
    How was color and beam splitting handled?
    Thanks, look at post #19 on the "Back then this is what we did" PLF discussion. It is documented there.

    This was the first version. In the second version I replaced the four MM1 mounts on the right with two facing, right-angle prism mounted with epoxy directly over the laser beam pass through holes on the right side of this mount that fed the right pair of XY galvos.
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  10. #20
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    Quote Originally Posted by lasermaster1977 View Post
    Thanks, look at post #19 on the "Back then this is what we did" PLF discussion. It is documented there.

    This was the first version. In the second version I replaced the four MM1 mounts on the right with two facing, right-angle prism mounted with epoxy directly over the laser beam pass through holes on the right side of this mount that fed the right pair of XY galvos.
    Yep, just as I suspected and why I asked.
    AOMs, the colormod of my wettest dreams, back in the day.
    Had the black aluminum channel, interlocked removeable covers, GS120 galvos, and even a (kinda) similar hand drafted RYGB AOM mixer design drawing on graph paper, but just couldn't afford the AOMs. So, I could only use Laser Images' dual prism & beam torquer, instead <sigh>.
    I can totally relate to that being your pride and joy projector.
    Well done!

    Roj
    What goes around, comes around;
    We project what others reflect.

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