Making a Monolithic Telescope Part 2: Machining Glass @HuygensOptics

Huygens Optics | Making a Monolithic Telescope Part 2: Machining Glass @HuygensOptics | Uploaded April 2022 | Updated October 2024, 3 hours ago.
The second video in the series about manufacturing a small solid telescope. Time to make my hands dirty while doing artisanal stuff.

CONTENTS:
0:00 Intro
0:46 The monolithic version of the Cassegrain
2:23 About baffles and stray light
3:18 Drilling the glass core
6:00 Radius milling the glass surfaces
9:35 Calculating the Best Fit Sphere in Excel
13:52 Drilling baffles
14:23 Using spherometers
15:44 This Beat is Spherotronic
16:31 Rough / fine grinding
18:05 Optical Pitch polishing
20:43 What's next?
22:05 Looking through the uncorrected device
23:34 Thank you!

Previous video in this series about the theory of aspherics and optical design:youtube.com/watch?v=awOvnubFE8M

Video on the concept of the monolithic telescope featuring inventor Rik ter Horst: youtube.com/watch?v=HxwhCmO90UQ

Video about radius grinding and the Loh CNC: youtube.com/watch?v=ahrMrOq_lzc

More about the properties of optical pitch: youtube.com/watch?v=eZx-dUtl5Pw

You can support Huygens Optics on Patreon: patreon.com/huygens_optics

Download URL for zip-file containing the example MS Excel sheet for doing BFS calculations: huygensoptics.com/assets/M2_best_fit_sphere_calculation.zip

Windows program for calculating milling angle and evaluating spherometer readings: huygensoptics.com/assets/mirror_calculator_V01.zip
Download and use at your own risk. Your virus scanner will probably evaluate this download carefully and scream murder and fire because it is a rarely occurring executable.

I used a few short clips from the following Youtube videos, assuming it is covered under "fair use" by placing references to the channels, and links to the corresponding videos in the description.

At 15:44, I made an 18 seconds remix of Technotronic's hit "Pump up the Jam". Please enjoy the original hit song by these Belgian techno pioneers: youtube.com/watch?v=9EcjWd-O4jI
At 23:21: Shot take from Edmund Optics video "How an Aspheric Lens is Made": youtube.com/watch?v=CVDT3u1La6w

Did I forget to mention you here? Let me know and I will set things straight.

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

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