Spectroscopy and laser cooling on the ${}^1{S}_0-{}^3{P}_1$ line in Yb via an injection-locked diode laser at 1111.6nm

We generate 555.8nm light with sub-MHz linewidth through the use of laser injection-locking of a semiconductor diode at 1111.6nm, followed by frequency doubling in a resonant cavity. The integrity of the injection lock is investigated by studying an offset-beat signal between slave and master lasers, by performing spectroscopy on the $(6s{)}^2$ ${}^1{S}_0-(6s6p)$ ${}^3{P}_1$ transition in magneto-optically trapped ytterbium, and by demonstrating additional laser cooling of ${}^{171}$Yb with the 555.8nm light. For the ${}^1{S}_0-$ ${}^3{P}_1$ spectroscopy, we confirm the linear dependence between ground state linewidth and the intensity of an off-resonant laser, namely, that used to cool Yb atoms in a ${}^1{S}_0-$ ${}^1{P}_1$ magneto-optical trap. Our results demonstrate the suitability of injection locked 1100-1130nm laser diodes as a source for sub-MHz linewidth radiation in the yellow-green spectrum.