Building a retractable laser light saber @Marbslab

Uploaded February 2024 | Updated September 2026, 2 days ago

#lightsaber #retractableLightsaber #retractable #laser

It works, but there is some room for improvement:
- Faster linear motor
- Degassing of the glycerine to remove trapped air
- Vent valve

Another option would be not to use a plunger at all, but an easily compressible gas such as CO₂. However, you would then have to dissolve CO₂ in glycerine to saturation beforehand.

By the way, the laser beam in the air is not visible to the human eye.

Building a retractable laser light saber

Short XFS5152CE Speech Synthesis Module demo

Making nitric acid by the Ostwald process

Building an expansion cloud chamber from scratch - Part 4

Iodoform - Synthesis and antiseptic properties

Making azobenzene, a photoswitchable chemical compound #Azobenzene

Building a small, fully automatic Birkeland-Eyde experimental reactor

Building a Hamamatsu phototube flame scanner

$Powering a Geissler tube by hand #wimshurst #geissler #helium In this video, I show you how to operate a Geissler tube with a Wimshurst machine. The Wimshurst machine is from AliExpress, and the Geissler tube is from eBay. Geissler tubes are filled with various gases at low pressure, with metal electrodes at each end. A high voltage of several thousand volts is applied between the electrodes. The high voltage ionizes the gas, causing it to give off light by fluorescence in a glow discharge. The color of the light depends on the gas used. To give it a vintage look, I made a new base from lime wood and tube holders from turned wood. I also made the brass wire connections myself and paid attention to other historical details. My Geissler tube is filled with helium. I checked this with a diffraction grating by looking at the spectral lines.$