Optical

2003

Homebuilt CO₂ gas lasers My early (2003-2004) attempts at building several CO₂ lasers

2004

Zeeman effect An old page with photos of the Zeeman effect experiment I did at university

Sodium street lamp Old sodium street lamp running from an NST

2009

Uranium marbles Some pictures of uranium marbles fluorescing

2010

RF CO₂ laser head Some pictures of the insides of a folded-resonator laser head.

2011

Digital camera spectroscope Attaching a direct-vision handheld spectroscope to a digital SLR camera

Running a mercury arc lamp from a TIG welder Using the HF start on a TIG welder to trigger an arc lamp and run it

Arc lamp attachment for a TIG welder Attachment for a TIG torch to turn it into an arc lamp

2012

Infrared projector Projecting an image that only a modified webcam can see

Taking shadow-free photos How to take good product photos without shadows

405nm 100mW UV laser diode A laser module using a blu-ray diode

2013

Thermal measurement of laser power Measuring the power of the CO2 laser cutter