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168,489 Views ⢠Mar 26, 2022 ⢠Click to toggle off description
00:00 General Intro
00:56 Spherical is easy
01:32 Aspherical is hard
01:59 Ideal lens vs. spherical surface lens
03:17 The concept of the light ray
04:47 A little optics quizz
06:21 Optimum spot size using iterative numercal analysis
07:56 Use of optical design software (Zemax)
09:45 Theory of aspherics
10:54 Conical aspherics
12:02 Polynomial aspherics and even aspheres
14:24 Numerical optimization in aspherics
15:30 Effect of introducing an aspherical surface
16:55 Optical design of monolithinc telescopes
18:23 Material choice and CTE
20:52 Classical Cassegrain configuration
22:10 Schmidt Cassegrain configuration
If you want to support the production of these videos, you can now become a Patron of the channel. You can find more information on : www.patreon.com/huygens_optics
Reference to my original video on tiny monolithic telescopes:
   â˘Â Why is this Space Telescope so Tiny? Â
LInk to my video on conics:    â˘Â Making a Mirror with a  Variable Surf... Â
For the record, I do not have any commercial ties to any of the companies or individuals that are linked below.
Zemax page for requesting a trial license of Optic Studio:
www.zemax.com/pages/try-opticstudio-for-free
If you want to know more about the workflow in Zemax, the great tutorial videos by Scott Sparrold
of OpticsRealm are a good start:
youtube.com/user/opticsrealm/videos
Youtube video discussing the optical design of the James Webb telescope:
   â˘Â Designing of the James Webb Space Tel... Â
The Thorlabs page with aspheric lenses and the formula:
www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=âŚ
I used a few short clips from the following Youtube videos, assuming this use is covered under the fair use policy by placing references to the channels and links to the corresponding videos in the description.
Clip from Yuri Petrunins "polishing 210mm lens":    â˘Â Polishing 250 lens . Â
Clip from Edmund Optics "How an Aspheric Lens is Made":    â˘Â How an Aspheric Lens is Made Â
Clip from Learn n hv fun "Refraction of Light Through a Glass Slab[...]:    â˘Â Refraction of Light Through a Glass S... Â
Did I forget to mention you here? Let me know and I will set things straight.
Views : 168,489
Genre: Science & Technology
Date of upload: Mar 26, 2022 ^^
Rating : 4.986 (27/7,500 LTDR)
RYD date created : 2024-05-12T04:00:35.003191Z
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YouTube Comments - 355 Comments
Top Comments of this video!! :3
I studied physics at university, and I am always shocked how little we (physicists) know about optics when in comes to practical design considerations. I love this video(s), looking forward to similar videos in the future!
278 |
As a lens designer, this is a fantastic introduction into the crazy world of optical design! I'm excited to see this project be manufactured.
56 |
Oh my goodness, this is so excellent!
I have an ancient degree in physics had been interested in optics for a long long time. I knew "about" many of these designs and some of the math.
But for the first time you put it together in full and comprehensible explanations. My goodness you tackle the subject so well. I've learned so much from this video. Thanks more than I can express.
I think your video, How big is a photon?, is groundbreaking.
I'll take an easy guess and say that only a tiny fraction of physics PhDs would get the right answer to your single-photon unequal-optical path interference experiment. The video should be mandatory for all physics students.
31 |
Thank you. It's a genuine privilege to have access to a presentation like this.
29 |
Fantastic information, thanks for sharing it! Really helpful to see an expert walk through the optimization process and explain different details, pros/cons of choices, etc. Looking forward to the fabrication video!
26 |
Canât wait for the next part. In university I learned about the theoretical process of designing an optical system but I never learnt the practical ways of making lenses or curved surfaces for mirrors. Especially aspherical ones.
19 |
your approach to explaining the theory is on point for the laymen (me), perfect đđ
27 |
Hells Bells ... I thought I knew a little about lenses, but you utterly blew my mind within six minutes!!! Fascinating project - I'm going to savour each and every one of the videos in this series.
1 |
In my 20's I tried to make a Schmidt plate with the original vacuum method, pretty much manually like he did back in the day. It was very hard work because I was afraid of losing some vacuum during fine grinding and polishing (like he was also). So I had to work for a long day.
I made the pan from concrete, ground lip flat, installed the valve and sealed the pan carefully etc.. To decrease amount of deflection I did both sides of the plate.
Unfortunately I indeed lost - for some reason - some vacuum when working on second side and started to have difficulties with the contact etc. and finally gave it up having become too tired of it. However first side looked visually correct on the flat, so it wasn't a complete failure. And at least I got quite a lot experience from that technique which certainly has some challenges and limitations.
I remember solid telescopes were presented in one of the ATM 1-3 books which were my "bible" in those days. Perhaps a bit outdated even then but full of enthusiasm about optics and telescope making.
Thank you very much for the interesting videos. One of my favorite YT channels
5 |
Omg, I am so exited for this series. I love tinkering and getting the absolute maximum out of a design (although in my case, thatâs algorithms).
That reminds me how I used GDC recently myself for designing a real item. I had to measure a weird corner of my apartment for some shelves, totally not rectangular. Parametrized a quadrilateral, defined an error function to my measurements and used GDC to minimize it. The CNC cut plywood shelves fit perfectly.
26 |
I can't wait for the next one.... I'm going to try this. So please don't leave us hanging too long...
6 |
Optics has always fascinated me, but honestly, I know little about optical design beyond what I know from high school. This introduction is a WOW for me! Thank you for this.
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Thank You for your detailed yet broad treatment of this project! Your narration is clear (the Dutch accent is just icing on the cake!) and your pace is perfectâkeeping my attention without blurring past the subtleties or dragging things out. Fantastic!
This re-kindles the love of optics that started for me when my father first showed me the moons of Jupiter through a 60mm spotting scope when I was 6 or 7 years old.
Thank You for this quality content đđ˝
10 |
Heâs back
3 |
Being a physicist with major optics, I can only say I admire what you did here. Great teaching skills.
2 |
Fascinating. Can't wait to see the practical aspects in follow-up videos.
20 |
So clear, thank you. Funnie that the simplest shape does a good job. I mean that the lens formula is simple. We dread the idea that that would not have worked! zSailors would have seen blurred ship images..anyway, it is a mysterie to me how they used the eyeglasses on their wobbly oak boats..
3 |
Your explanations were very easy to understand, good video.
11 |
As a CS grad I was excited to see numerical optimization popping up. I almost jumped the gun and mentioned getting stuck at a local minimum after your first discussion; good thing I waited lol.
1 |
@HuygensOptics
2 years ago
Even though this is my longest video so far, it was still only possible to discuss a tiny fraction of the aspects of optical design. Things like MTF, PSF and wavefront errors were kept outside the scope. However, I hope I can make up for some of this in the follow-up video. Also, If you have specific aspects that you want me to dive in a bit deeper, please comment to this post and maybe I can discuss these as well. By the way, sorry about my pronunciation of the word "radii". I used the Dutch way of pronouncing it and not the correct English / American way. Also the "Z" symbol allows for multiple pronunciations, the one I used might not be the one of your personal preference.
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