Lasing without inversion III: microwave coupling induced atomic coherence

摘要: We consider the nondegenerateA quantum beat laser, and investigate possibility of lasing without population inversion when coherence is established, between lower levels, by applying a strong microwave field. For specific example we calculate how much may be established levels using coupling. Analytical calculations are presented for both open closed three level atomic systems, perturbation theory up to third order in optical fields. Taking linear equations, show numerically gain achieved.