Information  > Hobby Projects  
   Hobby Projects (page 1)        Return to page 1
In my spare time I like to make videos on technical subjects, which are published on the Huygens Optics Youtube Channel.

Making Tiny Fresnel Lenses (in Times of Corona). Apr 5, 2020   
This video shows several types of micro-lenses that I made using a DIY maskless wafer stepper. The tiny lenses can for example be used for building a Shack-Hartmann wavefront detector.

Maskless Wafer Stepper Part 3: Elecronics and Software. Feb 10, 2020   
This is the third (and final) video on the DIY maskless wafer stepper project. It discusses the electronics and software.

Micro Lenses made with Photolithography. Feb 6, 2020   
I'm quite excited to show you the focal properties of the 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.

Maskless Wafer Stepper Part 2: Mechanics Jan 25, 2020   
This video is the 2nd of 3 video's on the design and build process of a small maskless wafer stepper. It discusses the mechanical aspects of the machine, in particular the challenges that I face to achieve the requirements. I also show some crude footage of the first optically active devices.

Maskless Wafer Stepper Part1: Optics Jan 4, 2020   
I've been planning to make a maskless wafer stepper for a long time. In the last few months, I finally found the time! This video is the first of 3 video's on the design- and build process. It discusses the optical aspects of the machine.

How to make Very Flat Optical Surfaces on Glass Dec 16, 2019   
The video shows (hands on) how a nanometer level flat optical surface can be made. It first discusses the principle of the continuous pitch polisher, also known as the planetary polisher or optical lap master.

Metal Detector Discrimination Explained (with a Garret AT Pro) Nov 12, 2019   
In this video I discuss the principle of a VLF- type induction balanced metal detector (Garrett AT pro), in particular how the discrimination between different metals works. I do this by looking at the emitted and received signals of a test coil, so not by opening up the detector.

Next Level Spirit Level (for billiard / pool table) Oct 14, 2019   
Leveling a billiard table to an exact horizontal orientation requires a very accurate "spirit level" device (also called "bubble level"). In this video I show the complete process, from requirements and design, to prototype manufacturing of the bubble level from 2 borosilicate glass disks.

Optical Lens Centering using a LOH LZ-80. Oct 8, 2019   
Unfortunately it turned out that -after my Loh LZ-80 centering machine was brought back to operational status- the lenses were already correctly centered. The cause for their poor performance was actually in the construction of the optical tube holding the triplet. So in the end, centering of the lenses turned out to be unnescessary.

Polishing a Small Spherical Mirror Surface on a Glass Blank Sep 17, 2019   
This video is a follow-up from the video on spherical radius grinding. In this video I explain briefly the grinding process (using sIlicon carbide, SiC) and polishing process (using Cerium oxide, CeO and optical pitch).

CNC Radius Milling in Optics: the LOH Spheromatic Curve Generator. May 30, 2019   
In this video I discuss spherical radius milling of both metal and glass. In addition the principle of the Loh Spheromatic CNC 120 radius grinder / mill is discussed. This machine can be used to mill / grind spherical surfaces on glass and ceramic objects.

DMD Mirrors in a DLP-Projector Moving in Slow Motion (Stroboscopic Effect). May 9, 2019   
This video shows how you can view in slow motion the very tiny digital micro mirrors that can be found in for example DLP-projectors (beamers). The method used here is based on a combination of microscopy and stroboscopy and does not require a high-speed camera. By using this method, we cannot only look at the pixels in real time but at the same time slow down the switching process (which is in the microsecond time range) by several orders of magnitude.

DIY Photolithography using 1980s Carl Zeiss S-Planar Lens (405nm). Apr 13, 2019   
In this video I demonstrate how I used a Carl Zeiss S-planar wafer stepper lens to do micron-size photolithography and used this pattern to etch a chromium layer.

   Return to page 1