Berkeley Lab’s Frei Group was kind enough to share their space with me, and I could not have done that work without this high vacuum line. I’ve always loved the way understanding the components of a system can take a complicated image like this one and break it into understandable parts. This image, in particular, gets less odd after the realization that this is two lines, mounted back-to-back, in the same Unistrut frame.
Approaching the summer solstice, the start of fall-semester classes and their attendant labs seems far away, but a new class of St. Lawrence first-year students will be here before I know it.
This was one of the light sources students were interrogating: a sodium lamp, like the ones used in street lights (at least in the twentieth century—LED street lamps are becoming increasingly dominant now.)
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.
During sabbatical, I posted a lot of views like the one below: A dramatic dusk view of Berkeley and San Francisco from Berkeley Lab’s Building 62, where I spent my days doing renewable energy research. Ending a productive day, I’d step out onto the balcony a 30-second walk down the hall from my office to find these views readily available (when the marine layer didn’t intervene).
But to my memory, I’ve posted few shots of that balcony that was so integral to the sabbatical experience. Circling around to the adjacent Molecular Foundry, I took this image that (in the top left) shows that small balcony (with sun conveniently reflecting), as well as some of the lab infrastructure around in it. In the foreground is the liquid nitrogen storage tank for the foundry with its radiator covered in ice.