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.