We report what is believed to be the first demonstration of laser frequency stabilization directly to persistent spectral holes in a solid-state material. The frequency reference material was deuterated CaF<sub>2</sub>: Tm<sup>3+</sup> prepared with 25-MHz-wide persistent spectral holes on the H<sub>6</sub><sup>3</sup>→H<sub>4</sub><sup>3</sup> transition at 798 nm. The beat frequency between two lasers that were independently locked to persistent spectral holes in separate crystal samples showed typical root Allan variances of 780±120Hz for 20–50-ms integration times.
© 1999 Optical Society of America
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(140.2020) Lasers and laser optics : Diode lasers
(160.5690) Materials : Rare-earth-doped materials
(230.6080) Optical devices : Sources
(300.6320) Spectroscopy : Spectroscopy, high-resolution
P. B. Sellin, N. M. Strickland, J. L. Carlsten, and R. L. Cone, "Programmable frequency reference for subkilohertz laser stabilization by use of persistent spectral hole burning," Opt. Lett. 24, 1038-1040 (1999)