Effects of Field-Induced Coherence on Laser Without Population Inversion and on Absorptionless Dispersion for a V-Type Three Level System

摘要: A V-type three level system with two closely spaced upper levels interacting a single mode of the electromagnetic field is studied for absorptive and dispersive lineshapes. semiclassical description atom-field interaction being adopted to obtain usual optical Bloch equations. The approximate analytical solutions density matrix elements are obtained by solving coupled Through off-diagonal elements, introduction phase angles between participating in dipole allowed transitions automatic. It shown that these phases appreciable if applied strong. These dependent (coherence) responsible reduction inversionless gain absorptionless dispersion. For large decay constants, it found energy gap has no role play on laser without inversion However, population per unit decay, significant increase dispersion obtained. condition possible experimental realization discussed.