Hybrid optical and electronic laser locking using slow light due to spectral holes
Jian Wei Tay, Warrick G. Farr, Patrick M. Ledingham, Dmitry Korystov, and Jevon J. LongdellPhysical Review A, 87, 63824 (2013)
We report on a narrow linewidth laser diode system that is stabilized using both optical and electronic feedback to a spectral hole in cryogenic Tm:YAG. The large group delay of the spectral hole leads to a laser with very low phase noise. The laser has proved useful for quantum optics and sensing applications involving cryogenic rare-earth-ion dopants.