Spectroscopy and laser cooling on the ¹S₀-³P₁ line in Yb via an injection-locked diode laser at 1111.6nm

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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 ¹S₀-(6s6p) ³P₁ transition in magneto-optically trapped ytterbium, and by demonstrating additional laser cooling of ¹⁷¹Yb with the 555.8nm light. For the ¹S₀- ³P₁ 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 ¹S₀- ¹P₁ 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.