On May 16, 1960, Theodore Maiman of Hughes Research Laboratories was the first person to create the now ubiquitous and important source of light that we know as the LASER – Light Amplification by Stimulated Emission of Radiation. This year marks the 60 year anniversary of this achievement, and for this occasion I wrote a blog post for Cambridge University Press on the history of the laser!
Please check it out over at the CUP blog! This is part 1 of 2, and part 2, which describes a bit about how a laser works, will appear at the CUP blog later this week. I will of course post a link to that article, as well.
A photograph of laser speckle, just to give the post a little visual!
So this year is the 60 year anniversary of the invention of the laser, which was finally accomplished by Theodore Maiman on May 16, 1960 (mark your calendar!). I recently wrote a blog post about the physics and history of the laser to commemorate the occasion; I will share a link to it when it appears.
But one thing I came across while working on the post? The first newspaper article announcing the discovery! The article, written by Ralph Dighton for the Associated Press, was syndicated and appeared across the country around October 16, 1960. Of course, coming from such an important source of news, I’m sure it was a very subdued and unsensational take on the disc… oh, no.
I thought I should write a short post sharing some of the most lurid highlights from the article, which really made me chuckle.
Okay, here’s one more classic video from my regular seminar series: Forgotten Milestones in the History of Optics! This was one of the earliest semi-popular seminars I put together.
More videos and posts to come!
Continuing my series of uploaded videos, tonight I recorded a version of my How Not To Be Seen: The history and science of invisibility seminar, which I’ve given and revised for probably close to ten years now! I’ve shared links to versions before, but this is the most recent and up-to-date version, based on a lecture I gave at the University of Chicago last fall.
I was feeling a little scatterbrained during the recording, so I fumbled my speaking a couple of times; I hope it isn’t too distracting!
More videos to come! It looks like I’ll be home for quite a while, so there’s lots of science to be shared! As I’ve noted before, my next videos will be significantly shorter.
I while ago, I shared slides from a talk I gave at the Charlotte Amateur Astronomy Club on “Vortices in beams of light and vortex coronagraphy.” Now that I, like everyone else, am more or less homebound, I thought I would record it as a video for folks to hear what I actually would say during such a talk! This will be the first of hopefully a few more popular science videos I will make and share while social distancing.
Note: This one is based on a formal seminar I gave, so it’s a bit long and a bit technical (though no math). Future videos will be shorter and hopefully sillier.
This post is in belated honor of International Women’s Day 2020, March 8th, and highlights an important woman physicist who I was unaware of until recently!
I think almost everybody is familiar with the phenomenon of sunspots: relatively dark patches on the surface of the sun that come and go somewhat unpredictably and can range in size from diameters of tens of miles to diameters of 100,000 miles.
Sunspots visible during solar eclipse of October 23, 2014. By user Tomruen via Wikipedia.
Sunspots are colder than the rest of the sun’s surface, 3,000-4,500 K compared to the average surface temperature of 5,780 K, which gives them their darker appearance. You may also have heard that a large amount of sunspot activity can have effects on Earth, potentially screwing up our radio communications devices. But sunspots have also been (and remain so, to some extent) a relatively mysterious feature of the sun. A key piece of the puzzle to explaining what they are and where they come from came from experiments undertaken in the 1940s by a trio of researchers, one of whom — Ruby Payne-Scott — was one of the very first women to work in radio astronomy and an important founding member of that entire branch of astronomy. In this post, we’ll talk about Payne-Scott and her remarkable work on sunspots.
I am happy to announce that my next book signing for Falling Felines and Fundamental Physics will take place on March 18th at 6 pm at Malaprop’s Bookstore in Asheville!
Please consider coming out to hear me read from the book, show some short videos of cats falling, and personally demonstrate some of the techniques that cats use to land on their feet!
If you don’t have a copy of the book yet and can’t wait, the book can also be ordered directly from Malaprop’s at this link, and also through IndieBound at this link. I believe you can contact the bookstore to order a signed copy in advance from me, as well, if you can’t make the event personally!
I will be hyping this event for the next month, so please put it in your calendar, spread the word, and attend if you can!
I’ve been trying to get together enough focus to start reading fiction regularly again, and there was no better way to spark that interest and begin 2020 than by reading one of my favorite authors of all time, Ramsey Campbell. At the end of 2019, Flame Tree Press released a new edition of one of Campbell’s classic novels from 1988, The Influence.
If you’re unfamiliar with Campbell’s work, he is a master of establishing an atmosphere of creeping dread. His stories are about the thing that moves out of the corner of your eye, that figure you think you see outside your window that may have just been a tree after all, that feeling you have when you’re sure you closed the basement door, but it is somehow open nevertheless. Though not all of his novels follow quite the same pattern, The Influence is a perfect example of this style, and a great tale of slowly encroaching horror.