Why is this Space Telescope so Tiny? @HuygensOptics

Huygens Optics | Why is this Space Telescope so Tiny? @HuygensOptics | Uploaded October 2021 | Updated October 2024, 3 hours ago.
If you want to take a look through a similar telescope, follow this link:
youtube.com/watch?v=2lf6uuU51Z8&t=1608s

Optical Engineer Rik ter Horst shows us how he makes very small telescopes (at home) which are intended for use in micro-satellites.
Contents:
0:00 Intro
1:06 About telescopes and focal length
3:35 The Cassegrain telescope
4:38 The Schmidt-Cassegrain telescope
5:18 The monolithic telescope concept
6:30 Rik ter Horst Interview
10:25 Riks' polishing setup
13:51 About manufacturing aspherics
16:50 Advantages of solid telescopes
17:49 Dreaming about a VLTT

ORESAT PROJECT CORRECTION. I was notified that the name of the university behind the OreSat project is erroneous: It is the "Portland State University" (https://www.pdx.edu/), not University of Portland. Sorry about that! Direct link to the Oresat project: oresat.org

Rik published details about the 1993 version of this type of telescope on cloudynights.com in 2013. cloudynights.com/topic/406276-a-solid-30-mm-f10-schmidt-cassegrain (archived article)

2:34 The image shows the second telescope of Galileo, not the first telescope of Lipperhey.

The video contains images of external sources. Please visit their websites for more information:
- Star party image was taken from: nps.gov/cebe/planyourvisit/star-party.htm
- More amazing astro-photos made by Dick van Tatenhoven can be found at: https://www.sterrenwachtalmere.nl/donateurs/dick
- NOVA-Astron website: https://www.astron.nl/about/organisation/nova/
- Yerkes telescope photo from: space.com/26858-yerkes-observatory.html
- Source of image at 0:41 is bxoptic.com/production-workshop
- Image of the Schmidt plate and Cassegrain telescope taken from their respective Wikipedia pages:
en.wikipedia.org/wiki/Schmidt%E2%80%93Cassegrain_telescope
en.wikipedia.org/wiki/Schmidt_corrector_plate

Do you like what I do and want to support it? I'v recently started a patreon page: patreon.com/huygens_optics

Did I forget a reference? Objections? Please let me know and I will set it straight and add a link.

DMD Mirrors in a DLP-Projector Moving in Slow Motion (Stroboscopic Effect)

$Directional coherent wave source This short shows a directional wave source that is made by spacing omnidirectional wave emitters in a very specific configuration. The animations were created using the wave simulation code made by @DiffractionLimited As for the question at the end of the video about being able to spot how destructive interference comes about: this is basically impossible to see in the animation. So the answer to the question is NO. However, there are few ways that you can look at how the phenomenon comes about: 1) When moving away in the horizontal direction of a row of emitters, for every point there is an equal amount of emitters that has a particular phase, compared to the emitters that have a phase 180 degrees shifted. So, when adding up these 2 contributions for all the emitters together in a row, this results in a wave amplitude that is almost zero in this direction. 2) An alternative way to look at this is the following: because of the spatial separation of exactly 1 lambda in the vertical direction, a standing wave arises in the array that has almost equal field strength in the horizontal direction within the array. And because the sources are moving in phase with the standing wave, they cannot transfer energy into the surrounding field in the horizontal direction. This also explains why a low intensity in the horizontal direction exists. Both views are in my opinion valid, but I think the second one is a bit more intuitive. Simulation code supplied by @DiffractionLimited The image files for the simulation can be downloaded here: https://huygensoptics.com/2D_wave_sims/coherent_source_detail.png https://huygensoptics.com/2D_wave_sims/coherent_emitter_vertical_100.png #light #physics #optics #short$

DIY Photolithography using 1980s Carl Zeiss S-Planar Lens (405nm)

Maskless Wafer Stepper Part 2: Mechanics

$Gravitational Index of Refraction$

Carl Zeiss S-planar lens pt.2: resolution explained

$Coherence in star light This short discusses (very briefly) the difference between temporal and spatial incoherence. It also contains a wave animation of a telescope mirror that concentrates a field on a sensor. Of those of you who want to know more about coherence I made these videos: Temporal coherence: https://www.youtube.com/watch?v=dtcq5b0R65w Spatial coherence: https://www.youtube.com/watch?v=nba4ztLBEh0 Presented here are 2D-animations of a field, which means that the intensity of the focused light at the sensor increases with the diameter of the mirror. In a 3D scenario however, the intensity increases with the square of the diameter of the mirror, leading to a much larger difference between the incoming and focused radiation intensity. Simulations were created using the python code supplied by @DiffractionLimited The simulation image file can be downloaded from: https://huygensoptics.com/2D_wave_sims/telescope_incoherent_light.png Milky Way picture by Philippe Donn #short #light #physics #optics$

$How a Lens creates an Image. Contents: 0:00 Introducing rays 2:14 Light is a wave 4:00 Nils reached one thousand! 4:43 Effect of Numerical Aperture 6:46 About Critical Dimension 7:40 Effect of NA illustrated using a microscope 10:44 Diffraction in the Double Slit Experiment 12:30 Diffraction in the Circular Slits (Fresnel Zone Plates) 14:40 Effect of central obstruction on focus 15:05 Using diffraction to create an Image 18:59 Comparison to the Fourier Series Approximation 19:44 Image Creation and JPEG compression 20:59 Effect of wavelength on definition 21:35 Extroduction A list of links to subjects mentioned in the video: Nils Berglunds Channel: https://www.youtube.com/c/nilsberglund Link to the full NA video by Nils: https://www.youtube.com/watch?v=RbojFORps98 Making Fresnel Zone plates: https://www.youtube.com/watch?v=uf3Y0-6NbjQ Building a Maskless Wafer Stepper: https://www.youtube.com/watch?v w0Z2Y5vaAQ&t=343s Some images were taken from JW Middelink Systematische Natuurkunde Deel B. This book series is absolutely awesome. They made me enjoy my high school physics classes and that is why I held on to them for 40 years. The video contains a short audio clip that is inspired on another one bites the dust by Queen. I did not use the original drums and bass but, Freddy himself did contribute in his own special way. I consider this fair use but if you are the copyright owner, please contact me in case you consider this a copyright breach. Today on the date of video publication it is 32 years ago exactly that Freddy Mercury died of Aids. Apparently, the lady in the compression images is named Lena. If I had known the history behind the image and why it became so famous, I would probably not have used it: https://pursuit.unimelb.edu.au/articles/it-s-time-to-retire-lena-from-computer-science A correction about the name of ASML: currently, this is the actual name of the company, so without any reference to the origin of the abbreviation. Advanced Semiconductor Materials Lithography was the name of the joint venture of ASM (founded by Arthur del Prado) and Philips Electronics, intended for the development of photolithography machines. Did I forget to mention you? Please contact me and I will sort it out.$ $Micro Lenses made with Photolithography. Im quite excited to show you the focal properties of my microscopically small lenses that I made using photolithography. These lenses are actually Fresnel zone plates which use diffraction as the method for focussing the light. They were made using the DIY maskless wafer stepper. The lenses have more than one focal plane, and you can easily observe the 1st, 2nd and 3rd order focal planes when they are used in combination with monochromatic light sources. I used a static image from a video on meta surfaces. Please check out this video if you want to know more about this subject: https://www.youtube.com/watch?v=ETx_fjM5pms It is now possible to contribute financially to the Huygens Optics Youtube channel. Please refer to the About-page of the channel for details.$