Results 1 to 9 of 9

Thread: Amazing Diffraction Gratings - now rotating!

  1. #1
    Join Date
    Nov 2008
    Location
    San Marcos, Texas, USA
    Posts
    127

    Default Amazing Diffraction Gratings - now rotating!

    Almost a year ago I had the good fortune of discovering an envelope with the coolest diffraction gratings I had ever seen on my workbench. I don't know where I got them! Everyone that saw them said that they must be designed to rotate, but they are very small, only an inch or so square on plastic substrate.
    Then I discovered David Kumpula's "Scan Thru Rotator". I purchased one, and after a lot of work and waiting, I have the device all working, and installed the gratings yesterday. Wow! I am very happy. I stitched together a sample video of all of the gratings to share with y'all - Tim

    https://drive.google.com/file/d/1kwk...ew?usp=sharing
    1st Place Laser Jockey ILDA 2013-15, working for the ultimate fusion of lasers and music

  2. #2
    mixedgas's Avatar
    mixedgas is offline Creaky Old Award Winning Bastard Technologist
    Infinitus Excellentia Ion Laser Dominatus
    Join Date
    May 2007
    Location
    A lab with some dripping water on the floor.
    Posts
    9,543

    Default

    Tim,

    I was cleaning out a planetarium storage area on a Chicago area campus, having been the only one to place a bid.
    I found an envelope of custom gratings mounted in slide frames. Some of them look similar to what you have. A few were designed to be constellations. I'll dig them out in the morning and shoot some pictures.

    Love the video.

    Steve
    Last edited by mixedgas; 09-17-2021 at 17:12.
    Qui habet Christos, habet Vitam!
    I should have rented the space under my name for advertising.
    When I still could have...

  3. #3
    Join Date
    Feb 2011
    Location
    Missouri, USA
    Posts
    50

    Thumbs up

    Can't wait to see the trove you rescued

    Pointers
    O-Like 532@100mW & 650@200mW
    Survival Laser 445@1.1W
    Projectors
    Homemade Variable RPM Lumia Box 405@500mW & 532@100mW & 650@200mW & 460@1.3W
    Kvant CM6000 with ScannerMAX 506 30-40k galvos - 637@1.3W & 532@1.8W & 445@3W + DMX Lumia Gratings
    Self-Repaired 532@500mW + Pangolin FB3, Chinese Galvos, Analog Modulation
    Tools & Software
    Radiator Laser Synthesizer
    LaserBee USB 2.5W thermopile meter
    Spaghetti, RIYA Multibus Lite
    Pangolin QuickShow, Beyond Advanced, integrated FB4

  4. #4
    Join Date
    Jan 2006
    Location
    Charleston, SC
    Posts
    2,147,489,221

    Thumbs up

    Great video, Tim! Thanks for sharing.

    Regarding the scan-thru rotator, was this a pull from one of the REKE / LK projectors from China, or is this the new rotator design that David worked on with Ed Keefe? (I know the new design was vastly superior, but I seem to remember it was a little pricey; maybe $500-600 ish.?.)

    EDIT: Nevermind! I'm pretty sure it's the new rotator design that DK and Ed came up with!

    Assuming that you went with the newly designed unit, did you go with the stepper motor version or the one that uses a standard DC motor?

    Also, love the room-filling lumia you've got!

    Adam

    PS: This post just reminded me that I need to get in touch with Greg Southerland and see if he's got any more of that shower glass left. Been meaning to build a lumia rig for a while now, and I finally dug out some of the weird wavelength lasers I have in my stash (488 nm dpss & 575 nm dpss) so I could start laying things out. But I don't want to sacrifice the one nice stand-alone lumia wheel I have, so I need to see about getting another one from Greg.
    Last edited by buffo; 09-21-2021 at 07:06.

  5. #5
    Join Date
    Feb 2009
    Location
    East Coast of Southern Virginia
    Posts
    445

    Default

    Great video!

    Can we got some pictures of the gratings with just a stationary dot through them? Also pictures of the setup for those of us not familiar with the scan thru rotator would be great!

    Thanks for sharing.

    Quote Originally Posted by LaserWizard View Post
    Almost a year ago I had the good fortune of discovering an envelope with the coolest diffraction gratings I had ever seen on my workbench. I don't know where I got them! Everyone that saw them said that they must be designed to rotate, but they are very small, only an inch or so square on plastic substrate.
    Then I discovered David Kumpula's "Scan Thru Rotator". I purchased one, and after a lot of work and waiting, I have the device all working, and installed the gratings yesterday. Wow! I am very happy. I stitched together a sample video of all of the gratings to share with y'all - Tim

    https://drive.google.com/file/d/1kwk...ew?usp=sharing

  6. #6
    Join Date
    Feb 2007
    Location
    Fort Mill, SC USA
    Posts
    1,487

    Default

    Hey guys! I haven't been in PL for many months, but I'm pleased to see Tim making use of the Scan-Thru Rotator (STR). (Ed Keefe deserves 99% of the credit for creating this cool tool, by the way. He's a genius!)

    Tim (and PolishedBall) waited patiently as we worked through an error with the two-stepper motor version of the STR that we missed for a 7-position lumia wheel. Thankfully, we finally got them up and running and I'm pleased that Tim's results are so stellar with those cool gratings. I've got four installed in my small home environment, but I'm planning on adding a couple more. In my opinion, there is no such thing as "too much lumia"!

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

  7. #7
    Join Date
    Nov 2008
    Location
    Cleveland Ohio
    Posts
    2,473

    Default

    Quote Originally Posted by dkumpula View Post
    Hey guys! I haven't been in PL for many months, but I'm pleased to see Tim making use of the Scan-Thru Rotator (STR). (Ed Keefe deserves 99% of the credit for creating this cool tool, by the way. He's a genius!)

    Tim (and PolishedBall) waited patiently as we worked through an error with the two-stepper motor version of the STR that we missed for a 7-position lumia wheel. Thankfully, we finally got them up and running and I'm pleased that Tim's results are so stellar with those cool gratings. I've got four installed in my small home environment, but I'm planning on adding a couple more. In my opinion, there is no such thing as "too much lumia"!

    -David
    try nine color lumia….too much lumia

  8. #8
    Join Date
    Apr 2009
    Location
    North of Jackson Michigan USA
    Posts
    326

    Default

    The Photonotron I brought to SELEM has 6 colors, inspired by you guys.

    Thanks!

    …Mike
    Runs with Lasers

  9. #9
    Join Date
    Aug 2014
    Posts
    245

    Default

    That is awesome, thank you for sharing.

    https://drive.google.com/file/d/1kwk...ew?usp=sharing[/QUOTE]



    _________________

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •