Velocity-selective coherent population trapping in caesium ions

Abstract

The extension to high angular momentum transitions of laser cooling below the recoil limit based on velocity–selective coherent population trapping (VSCPT) is explored. An efficient VSCPT can be realized only by applying a compensation of the kinetic energy mismatch between the components of the superposition wavefunction and introducing repumping on the hyperfine transitions. Theoretical and experimental progress for VSCPT on cesium atoms is discussed.