With new thicker solid mu-metal magnetic shields (2 layers), the clock transition in our 88Sr+ experiments shows a transform-limited linewidth of ca 10 Hz using a 72ms probe pulse. More testing to follow, as we try to lengthen the probe-pulse and search for the ultimate linewidth limit.
One of the very first runs of the servo-lock of our ultrastable clock-laser to the clock-transition at 445 THz in 88Sr+.
Despite the lockdown, some trapping in the lab this week. First single-ion experiments this year, after the 405 nm laser broke in January. Not much going on in these videos, but at least it's a single ion!
First clock-transition linewidth measurement give about a 200 Hz wide transition, so around 5e-13 fractionally.