Summary: June 15, 2000 / Vol. 25, No. 12 / OPTICS LETTERS 905
Frequency stabilization of a frequency-doubled 1556-nm source
to the 5S1 2 ! 5D 5 2 two-photon transitions of rubidium
A. Danielli, P. Rusian, and A. Arie
Department of Electrical Engineering­Physical Electronics, Tel Aviv University, Tel Aviv 69978, Israel
M. H. Chou and M. M. Fejer
E. L. Ginzton Laboratory, Stanford University, Stanford, California 94305
Received January 28, 2000
Improvements in the power level of sources near 1550 nm and in the efficiency of waveguide frequency
doublers enabled us to lock a frequency-doubled source directly to the 5S1/2 ! 5D5/2 two-photon transitions
near 778 nm. We obtained a sufficiently powerful second-harmonic signal, exceeding 2 mW, by doubling an
external-cavity diode laser that was amplified by an erbium-doped fiber amplifier in a periodically poled LiNbO3
channel waveguide. Our experimental scheme can be used for realizing compact, high-performance frequency
standards near 1550 nm for fiber-optic communication and sensing applications. 2000 Optical Society of
America
OCIS codes: 230.7370, 190.4360.
Frequency-stabilized sources near 1550 nm are re-
quired for frequency references in dense wavelength-
division-multiplexed optical communications systems,1
fiber-optic strain sensing,2

Source: Arie, Ady - Department of Electrical Engineering-Physical Electronics, Tel Aviv University
Fejer, Martin M. - Department of Applied Physics, Stanford University

Collections: Engineering; Physics