In St. Lawrence’s Raman spectroscopy and microscopy lab, the most potent laser illumination source comes from a neodymium-doped yttrium aluminum garnet. This is a pretty ubiquitous laser source, but I happen to like it because it also demonstrates the value of nonlinear optics: though this laser is emitting light at 1064 nanometers (in the infrared), a suitable doubling crystal can combine two of those 1064 photons together to make a shiny new 532 nm photon.
The foreground of an image from the Berkeley Hills is usually a dark network of trees and trails, but the conveniently timed headlights of a car at Lawrence Hall of Science lit up the dry grasses of midsummer. Their oranges matched the sunset.
The laboratories of physical scientists across the planet have pulsed laser systems like this one, and many look quite similar: a collection of squat boxes covering optics, electronics, and beampaths. Above or below the surface of the table are additional boxes of electronics driving the lasers and detectors. This particular system is special to me for two reasons: (1) most modern laser tables don’t have rad wood grain paneling, and (2) this was the instrument I used during my sabbatical at Berkeley Lab last spring. Lots of good data emerged from its photomultiplier tube.
Berkeley Lab’s Advanced Light Source, a massive X-ray laser sourced from a building-sized particle accelerator, was undergoing upgrades while I visited. Construction in the area added an mundane veneer to the superscience happening inside.
After spending my entire adult life as a laboratory scientist, the web of gas lines and vacuum pumps and electrical cable seems normal. I do understand, rationally, that all of this looks overwhelming. There’s so much purpose and productivity behind the network, however, that it’s worth the sophistication.
In the Berkeley Hills, above the National Lab’s Advanced Light Source, the view over Oakland’s twinkling night sprawl entrances. Look at all of those light-emitting objects! As LED lights have replaced sodium vapor models, I’m particularly fascinated in the shift as cities glow white, instead of orange.