Abstract

We present a new scheme for 1D subrecoil laser cooling by velocity-selective coherent population trapping of even-even isotopes of elements found in the second group of the periodical table, particularity, ²⁰⁰Hg and ⁴⁰Ca. The scheme envolves the transitions (a) between the ground state with the total angular momentum F_g = 0 and the excited one with F_e = 1, (b) between the latter state and the second excited one with F_e′ = 2. The second transition belongs to the infrared region and has a width much smaller than the transition from the ground state. The lower transition is driven by two counterpropagating σ₊ and σ₋ polarized running waves. The laser beam applied in the perpendicular direction is a linearity polarized standing wave exciting the infrared transition.

© 1996 IEEE