Programmable laser frequency stabilization at 1523 nm by use of persistent spectral hole burning

Diode laser frequency stability of 2 kHz to 680 Hz over 20 ms to 500 s has been demonstrated at 1523 run in the technologically important communication band by use of persistent spectral holes in the inhomageneously broadened I-4(15/2) --> I-4(13/2) optical absorption of Er3+:D- :CaF2. Laser frequency stabilization was realized without vibrational or acoustical isolation of either the laser or spectral hole frequency reference, providing the means for implementing a versatile, compact, stable source. (C) 2003 Optical Society of America.