Supercontinnum in Multimode Fiber Teaser
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- Опубліковано 28 вер 2024
- Episode 48
This is a short teaser trailer of where this project goes next!
Tempted to call it: Supercontinuum, bigger brighter and uncut!
Multimode Fiber (50/125) can generate extremely bright continuum, because of excellent coupling efficiency.
Nonlinear effects abound here, and the fiber even exhibits mode cleaning!
This is bright enough to film in daylight, and so obligatory smoke shots abound!
I am planning on making this more in-depth than the last, so comment below how long it should be:
10 minutes
15 minutes
25 minutes
Also, is there an appetite for short videos at all (Odd bits that I might not consider doing a full video on, 2 minute teardowns, that kind of stuff)?
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As long as it takes. You are a good teacher!
Tease !....cheers.
I couldn't resist! 😁
The Bell is ON! 🙂
Looks fantastic! (Unfortunately since the video is filmed properly, instead of cropped vertically, it doesn't actually show up as a 'short' on youtube, but I prefer proper videos anyway!) Looking forward to the full video!
It might do eventually, one of my odd short videos from back in the day made some appearance as a short, so I though I would have a crack and see if the algorithm would slurp it up. I did think about portrait, but like yourself, I prefer a sensible aspect ratio. Perhaps UA-cam doesn't know you can rotate a phone..... :-D
@@LesLaboratory When the 'shorts' feature was forcibly introduced, all vertical videos 59 seconds or less in length were turned into shorts. It's annoying, because as far as I know, they don't enable automatic CC on shorts, and I haven't manually checked to see if uploaded captions work either... so a lot of old short, vertical videos lost their CC when youtube forced the change.
Perhaps that's why one of yours was turned into a short? It's youtube, who can ever be sure :)
@@StormBurnX I have untagged it in case it does something weird, but I suppose YT will do what YT does. I tried converting it, but it crops my embedded text and there is no scope to crop and rotate the video. I need to do my homework, but it works as a small trailer in any case. All hail the algorithm!
Make it as long as it want. It is fantastic
Looks great. About 4 hours of gratuitous smoke shots should do it 😃
lol don't tempt me!
Much more light!
i like saving time: as long as it needs to be
I'd love to experience a room lit by supercontinnum laser light.
Make it 1 hour long.
I choose a length of 25 minutes.
is the variability in the output visible in person or is it an effect of the camera?
There is variability, but it beats with the camera frame rate in weird ways.
Pure ❤
can i get your linkedin id sir?
It works well with a dye pump because the imput power is KW range and mode spacing is extremely wide (several nanometers) The math of what is hapoening is mind melting but suffice to say it is nonlinear parametric oscillation and amplification. The modes create zones of intense polarization by the electric field causing the pulse to transform. It would be far more efficient in a UV grade silica fiber and the smaller the diameter of the core is the stronger the electric field is to create more gain. Other choices of laser that are good for this use are alexandrite and Ti Sapphire. Dye is the cheapest by far though. 🤓❤
do the Zeeman/Stark effects play a role?
That caught me of guard - most paper write of self-phase modulation as the dominant effect for super continuum generation (other than solition fission stuff), not parametric amplification.
in this the dominant mechanisms are Stimulated Raman Scattering and Self Phase Modulation. In PCF fibers, other effects are dominant.
@@TheTablet314 ya he's just blowing smoke. If it's done in a fiber then it absolutely isn't OPA/OPO (saying both was a red flag in the comment as well tbh). SCG is a self-phase-modulation effect, no additional description required in most cases I have seen so far.
Looks great Les! Nicely done.
Thanks! It gets way better, nonlinear effect abound in Multimode cable, including something that looks suspiciously like self mode cleaning (Thanks to John Dudley for the tip!). The follow up is still in the works, as I have been waiting on a fast photo-diode, and a suitably fast oscilloscope so I can do some relatively serious measurements.
Looking great! Lovely smooth camera pan too
Thanks for the feedback! I built the rig to do it. I think motion helps you guys see it as I see it :-)
@@LesLaboratory definitely! The sense of depth and multi perspective really made it clearer
@@LesLaboratory A piece of advice, I did a short video and the average watch time on my channel tanked, causing (I think) UA-cam to effectively delisit me for about five months due to the change in analytics. I've still not recovered to my pre-short viewing levels. Take care while experimenting with the format!
@@bansci noted thanks! Yeah my analytics are all over the place, as I can't necessarily predict exactly how long a project will take, but the biggest concern is decent content, I don't want to be pumping out trash every week. From the comments so far the consensus is ~25 min which to me sounds right. I would rather just ask than guess at what people want to see.
look at that Kerr effect go!
I mean... not really. 😂 The kerr effect isn't strictly necessary for self-phase-modulation, right?
@@DAVOinIN Kerr effect from what I know is what allows 3 order susceptibility and is part of the mechanism driving supercontinuum generation.
@@Zenodilodon You're totally right about them being related, but the nonlinear optical Kerr effect is actually driven by the 3rd order susceptibility, not the other way around. Similarly, self-phase-modulation is a Chi-3 process, but doesn't technically require that Kerr lensing also occurs. In air you probably won't see significant self-phase-modulation without Kerr self-focusing, but in a fiber the resonant modes of the waveguide will produce large enough field-densities to produce SPM on its own.
The two can often be hard to disentangle in my understanding, but I believe they are still separate within some systems/situations.
@@DAVOinIN This is the video I watched along side reading Nonlinear Optics by Fred Wilkins.
ua-cam.com/video/YDSiY8Psbno/v-deo.html
I can't say I fully get it at all, still very rough on learning the finer details, which never seems to end lol.
I have been trying to wrap my head around NLO because I want to make some interesting models for demonstrations.
If you have insight on reading material/videos to watch I would love that!
@@Zenodilodon oh nice! Fred Wilkins is great. Highly recommend checking out Alfonso's book on SCG as well as Boyd's book on nonlinear optics.