Abstract

Recently Hansch and McIntyre¹ suggest ed a novel configuration of nonlinear crystals, tunable optical sources, and suitable phase-locking electronics by which optical frequencies can be phase-locked relative to microwave sources. For the measurement of interesting physical quantities such as the Rydberg constant, Lamb shifts, and various optical term energies, one would use the method to start from the microwave transition in Cs (currently defining the second/hertz) and work up to the optical frequency range.

© 1990 Optical Society of America