Optically Pumped Alkali Laser in Pure ⁸⁷Rb Atom Cell Without Buffer Gas

This paper theoretically advances a new method to establish population inversion between energy levels of pure ⁸⁷Rb atom without buffer gas driven by appropriate laser fields. With the help of density matrix equation and numerical computation tool, the lasing dynamical behavior of ⁸⁷Rb atom with population inversion in a cavity is demonstrated. The detailed properties of this lasing dynamic behavior and the atom-cavity coupling with photon are also discussed. This method can be extended to other alkali atoms.