Light so intense it can Ionize air! Q-switching a cheap YAG Laser. There is even a hint of modelocking starting in this thing, so that will be a future video! @johnmdudley youtube.com/watch?v=h0LF1kq0…

youtube.com/shorts/MZdHofoIP… #shorts​ Poppy Wilkinson is taking part in a Race for Life Pretty Muddy on the 12th July 2025 to raise money for Cancer research UK. To cheer Poppy on, and give money to Cancer Research please donate below: fundraise.cancerresearchuk.o… Thank You!

Here is a hint for my latest project, taken with a mobile phone camera no less. If you know, you know! @johnmdudley @BreakingTaps

Asking ChatGPT about UK law and out of frustration asked if it was legal to summon Cthulhu. Best answer ever! Made my day!

Want to grow large crystals of Potassium DiHydrogen Phosphate for nonlinear optics and pockels cells in a week? This video is for you! youtu.be/uSSoSIcXWa0 @thecrystalverse @johnmdudley

Want nanosecond moderately high peak power Laser pulses? An Avalanche Laser Diode Pulser! youtu.be/3-htF8Jrixo

Open Cavity He-Ne Laser the Motion Picture :-D youtu.be/PLr8smynpdw #photonics #laser

An open Cavity Helium Neon Laser just doing its thing...

Well since it is the international day of light, I have a new toy. A very short, brewster windowed HeNe tube. Melles-Griot 05-LHB-564. Some fun stuff lined up for this one for sure!

It's the international day of light! lightday.org/ #lightday

A smartphone photo of the Sunspot, through a home made Solar Telescope I built aeons ago! I think I should crack out the webcam and see if I get a better shot!

Ever wondered what happens if you reflect a Laser beam back in on itself? A manufacturer in the min 1980's built a piece of equipment that does just that! youtu.be/ad4hxXz4bwA

Laser Particle Counter Tear-Down. Vintage Helium-Neon Laser goodness! m.youtube.com/watch?v=oUM1OD…

An interesting piece of vintage tech showed up today, complete with vintage Laser goodness!

The most horrifying piece of equipment I have ever torn down, a tattoo removal Laser, that seems to be built with the added feature that it can also remove the operator. Permanently. m.youtube.com/watch?v=8khFci…

An SMPS repair. This is from a Laser and it water damaged, two open resistors, a blown MOSFET and a blown SCR (for which there does not appear to be a datasheet!)

The other Goliath KDP crystal. Again, accidental as part of a larger experiment, but learning is happening!

I accidentally grew two large KDP crystals overnight! I was preparing a supersaturated solution for growing.(The other was larger but malformed since it grew against the side of the beaker). These have a few defects, and aren't quite clear, but still, a nice surprise!