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  • jdavis7765's Avatar
    Today, 09:03
    Hey everyone, I wanted to start a new thread which is somewhat a continuation of https://photonlexicon.com/forums/showthread.php/27890-Hello-All-Laser-Question-Help/page5. I will have my new Compact 506 Scanners today and have a few questions on the upgrade as I really do not want to fry...
    0 replies | 0 view(s)
  • dkumpula's Avatar
    Today, 05:57
    Thanks, Brad! I've done a lot of flying close to the water - as low as the 4-5 foot range - and have only received one or two warnings indicating that the ultrasonic sonar is having problems with understanding it's distance to the ground. I believe that only happened when I was flying manually...
    52 replies | 4669 view(s)
  • laserist's Avatar
    Today, 03:18
    laserist replied to a thread CYGN-B in The Lounge
    I've always assumed there was a sine lookup table that was used to generate the dogloids. I was particularly impressed when using the dogloids to do beams.
    177 replies | 11231 view(s)
  • Bradfo69's Avatar
    Today, 02:40
    Nice! I think what would be most nerve wracking on this flight is a) if it's too close to water, the system that identifies whats below the bird takes over from GPS and if it can't find identification references, you risk a flyaway and b) when it loses signal, it maintains it's speed and altitude...
    52 replies | 4669 view(s)
  • Greg's Avatar
    Today, 02:10
    Greg replied to a thread CYGN-B in The Lounge
    Thank you for posting the clip, Ron! That looks SO much better that the version available on youtube. I would much rather hear scratches from the vinyl than digital aliasing on my classic rock. Do you have the training tape for the whole Police show? From what I have seen on line, that entire show...
    177 replies | 11231 view(s)
  • dkumpula's Avatar
    Yesterday, 12:05
    Exactly! You must mean like this flight from Hungry Mother State Park this morning:
    52 replies | 4669 view(s)
  • ronhip's Avatar
    Yesterday, 09:39
    ronhip replied to a thread CYGN-B in The Lounge
    I've attached a zipped mp4 (this forum does not allow direct mp4 attachments...) of the section you pointed to below, without all the messing around with contrast and saturation. You may be able to see more of the scan subtleties that were lost in the youtube version. Excuse the 60Hz hum. These...
    177 replies | 11231 view(s)
  • ronhip's Avatar
    Yesterday, 09:24
    ronhip replied to a thread CYGN-B in The Lounge
    Greg, You got them! Those ARE the dogloids. Sorry that Scott went a bit too far with his enhancement of contrast and saturation when processing the video. The rotating box (the only way I can describe it) also has another wrinkle to it. Depending on when the dogloid is selected, that specific...
    177 replies | 11231 view(s)
  • laserist's Avatar
    Yesterday, 05:49
    laserist replied to a thread CYGN-B in The Lounge
    Yes, those are dogloids in the video... The Police show was several years after I left.
    177 replies | 11231 view(s)
  • Lazerjock's Avatar
    Yesterday, 04:34
    Having a Part 107 License has its pros and cons. If you plan to fly for money then you definitely need it. There are rare locations I am able to fly under my 107 that I can't as a recreational pilot......legally. Then there is the "I didn't know that" scenario. Sometimes it's better to ask...
    52 replies | 4669 view(s)
  • Greg's Avatar
    Yesterday, 02:07
    Greg replied to a thread CYGN-B in The Lounge
    In which case a show that came after Crystal Odyssey might have them. Good point, Brian. The Police show on first inspection does appear to have more code, and different. And there is a number from that show which has several images which look to me like the dogloids. Video is here: ...
    177 replies | 11231 view(s)
  • VDX's Avatar
    Yesterday, 01:26
    ... yes, exactly my point -- power rulez!! :cool: Viktor
    5 replies | 153 view(s)
  • plazmatron's Avatar
    Yesterday, 01:07
    Thanks for all the comments guys. Sure, yes, you can drive them with Diode Lasers, but only under specific circumstances with a very well designed cavity. I have seen a couple of academic papers on this. It certainly looks possible, but output powers seem so low, I might as well invest my time...
    5 replies | 153 view(s)
  • VDX's Avatar
    Yesterday, 00:44
    ... the needed peak powers are pretty high! - my Nitromite emits 200ps long pulses at roughly 400 Kilowatts(!!) peak power with a repetition rate of 30 Hz (averaged in the Milliwatts). Viktor
    5 replies | 153 view(s)
  • mixedgas's Avatar
    07-04-2020, 17:43
    There are now CW diode pumped dye lasers, but required active cavity length matching, locking, diode wavelength and linewidth narrowing, a custom 4 mirror ring cavity, and custom chemically modified dyes are required to work with a 445 pump. Two dyes are used as a donor-receptor pair. For a few...
    5 replies | 153 view(s)
  • absolom7691's Avatar
    07-04-2020, 15:02
    Really awesome video! Thank you for sharing! What kind of peak powers are needed for the dye to achieve a lasing state? I would imagine pretty high considering there are no CW diode pumped dye lasers.
    5 replies | 153 view(s)
  • dchammonds's Avatar
    07-04-2020, 13:22
    Never underestimate what can be done with analog circuits- think about all those synthesizers from back in the 60's & 70's.
    317 replies | 76114 view(s)
  • james's Avatar
    07-04-2020, 12:14
    Really? Using the concept of a pendulum that has amplitude, frequency, phase and damping in the form x(t) = P1(t) + P2(t) y(t) = P3(t) + P4(t) and animating it by doing linear interpolation between two sets of pendulum specs? This is a bit more than a Lissajou.
    317 replies | 76114 view(s)
  • plazmatron's Avatar
    07-04-2020, 12:12
    I though you guys might appreciate this video. An LSI Nitrogen Laser teardown, and a Dye Laser Demo! https://m.youtube.com/watch?v=US3vLJIUGoU Cheers!
    5 replies | 153 view(s)
  • swamidog's Avatar
    07-04-2020, 09:54
    just about every single abstract generator....
    317 replies | 76114 view(s)
  • laserist's Avatar
    07-04-2020, 07:23
    laserist replied to a thread CYGN-B in The Lounge
    I remember the dogloids as being a Crystal Odyssey thing...
    177 replies | 11231 view(s)
  • Greg's Avatar
    07-04-2020, 04:27
    Greg replied to a thread CYGN-B in The Lounge
    Bit of a damp squib to report. Starship and Laserock2 mon and pts roms have been reviewed. Both contain byte for byte the identical block of code I have been already working with, meaning the five previously discussed routines. Each rom also contains one small bit of code that feeds points to the 4...
    177 replies | 11231 view(s)
  • Bradfo69's Avatar
    07-04-2020, 02:17
    Here is a few resources to get you started. https://pangolin.com/blogs/education/creating-safe-laser-shows https://pangolin.com/blogs/education/laser-show-compliance Q12: What are the basics of laser safety? A12: In general, the cardinal rule of operating high powered lasers is: Do...
    5 replies | 283 view(s)
  • dchammonds's Avatar
    07-03-2020, 22:29
    Uhhh, I was just thinking it would be easier to deal with a little at a time vs one big file with a whole bunch of stuff at once. My bad...:rolleyes:
    317 replies | 76114 view(s)
  • james's Avatar
    07-03-2020, 22:23
    Just out of curiosity, have there ever been any other implementations of an animated harmonograph generator for laser display? I mean the kind described here: https://en.wikipedia.org/wiki/Harmonograph
    317 replies | 76114 view(s)
  • james's Avatar
    07-03-2020, 21:54
    What??? I'm not sure how I could make it any simpler. BTW, your version of rhodoneas (animation) shrinks down because you set the radius of the second state to 0.1. Do you have any questions about how any of this works? Grab LB_temp.zip again or the whole thing. I just tweaked something...
    317 replies | 76114 view(s)
  • dchammonds's Avatar
    07-03-2020, 19:32
    You might want to include a few simplified txt files in your bundle to make it easier for beginners to get started.
    317 replies | 76114 view(s)
  • james's Avatar
    07-03-2020, 11:39
    Fixed it. Now you have to type the dot at the end of math. to differentiate it from math2.txt. LaserBoy_2020_07_03 James.
    317 replies | 76114 view(s)
  • james's Avatar
    07-03-2020, 10:52
    Well, something is weird. I had a whole mess of txt files in my ./LaserBoy/txt folder. So I moved them all but math.txt and math2.txt and now it doesn't even give me an opportunity to type a file name. It just asks me how to load math.txt. I'll fix it. So have you made any of your own...
    317 replies | 76114 view(s)
  • dchammonds's Avatar
    07-03-2020, 08:54
    I get the same problem on both my laptop&desk machines. Are you sure that you had both math.txt & math2.txt in the directory when attempting to select an input file?
    317 replies | 76114 view(s)
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