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Charles Hard Townes

Doc Mike Finnley, Going Postal
20th Century

Happy Birthday, Ruby!

16th May 2020 Doc Mike Finnley 0

Above photo: My ruby laser with a ‘mirror alignment laser’ just off to the right hand side of the photo. A small amount of smoke in the air makes the alignment laser-beam visible. In the [more…]

Engineering

Making A Ruby Laser – Part Five

25th September 2018 Doc Mike Finnley 0

Melting a hole through steel: The above image needs a little explanation! The Doc messed up his camera settings and under exposed the image. So I loaded it into Gimp and played with the curves [more…]

Engineering

Making A Ruby Laser – Part Four

11th September 2018 Doc Mike Finnley 0

The Doc’s ruby laser focused onto a lighter flint. The flint has been glued to the end of a match stick. The ‘explosion’ measures approximately 4 inches diameter. Interesting things to note are the ‘candy [more…]

Engineering

Making A Ruby Laser – Part Three

14th August 2018 Doc Mike Finnley 0

More information on laser speckle can be found here:  Speckle pattern A Mirror Alignment Tool The most important part of constructing a ruby laser (or any laser with external mirrors) are getting the mirrors alligned [more…]

Dr Mike Finnley, Going Postal
Engineering

Making A Ruby Laser – Part Two

31st July 2018 Doc Mike Finnley 0

(a ruby rod lit by two bright blue LEDs. Due to the IR filter in my camera the pink colour is actually red. What you are seeing is the absorption of the blue light and the [more…]

Engineering

Making A Ruby Laser – Part One

21st July 2018 Doc Mike Finnley 0

Introduction For many years the Doc has had the desire to attempt the construction of a ruby laser. After six months of hard work, disappointment, late nights, lots of booze and a drained bank account [more…]

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Elsewhere on GP

  • Larry’s Diary Week Eight

    20th October 2019 0
    Monday Unlike my prediction on Saturday, yesterday was reasonably peaceful here at Number 10. The only thing worth mentioning was that David Cameron is stirring it up again in the Sunday papers. Everyone hates a [more...]
  • Always Worth Saying’s Presidential Debate Review

    26th October 2020 0
    Presidential Debate 22nd October 2020 Contestants: President Donald J Trump (Republican) Former Vice President Jo Biden (Democrat) Venue: Nashville, Tennessee Tennessee sits in ‘rattle through’ as well as ‘fly over’ America. Your humble author has [more...]
  • Jacques Hughes, Going Postal

    Confessions of a campsite courier, Part 1

    24th November 2020 0
    Background For some of you, the title of this piece has probably resurrected memories of certain quality films from the 1970’s. Here, however, I have used the word “confessions” mainly for alliterative purposes. Not that [more...]
  • Artwork In My Home – Part One

    24th April 2020 0
    Finding myself with lots of spare time on my hands I thought it might be interesting for one or two Puffins on GP if I shared pictures of some of the artwork in my home. [more...]
  • Going Postal with Question Time

    20th June 2019 0
    Graphic EJ – Updated by Sam. Fiona Bruce presents an hour of topical debate from Tottenham. On the panel: Brexit minister Kwasi Kwarteng MP, digital minister Margot James MP, shadow business, energy and industrial strategy [more...]

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