A steady-state magneto-optical trap (MOT) of fermionic strontium atoms
operating on the 7.5 kHz-wide 1S0−3P1 transition
is demonstrated. This MOT features 8.4×107 atoms, a loading rate of
1.3×107atoms/s, and an average temperature of 12 μK. These
parameters make it well suited to serve as a source of atoms for
continuous-wave superradiant lasers operating on strontium's mHz-wide clock
transition. Such lasers have only been demonstrated using pulsed Sr sources,
limiting their range of applications. Our MOT makes an important step toward
continuous operation of these devices, paving the way for continuous-wave
active optical clocks.Comment: 11 pages, 7 figure