Population trapping and coherent transillumination of a three-level medium by a periodic train of ultrashort pulses
Abstract
Attention is given to ultrashort pulse train propagation in a resonantly absorbing medium in which two ground-state sublevels are optically coupled to a third. It is shown that the nature of the pulse train propagation and the parameters of the steady-state medium depend resonantly on the relation between the level's splitting frequency (omega sub 21) and the pulse repetition frequency (Omega). Under resonance conditions where omega sub 21 = (m)(Omega)(m = 1, 2,...), a sufficiently intense pulse train can achieve coherent population trapping, i.e. it can transfer molecules into the coherent superpositioned state of the ground-state sublevels, leaving the upper level almost unpopulated. The effect of the coherent transillumination of the three-level medium by an ultrashort-pulsed resonant train is predicted; this effect is possible even when the emission intensity is much less than the optical transition of the absorbing one.
- Publication:
-
Zhurnal Eksperimentalnoi i Teoreticheskoi Fiziki
- Pub Date:
- May 1986
- Bibcode:
- 1986ZhETF..90.1610K
- Keywords:
-
- Coherent Light;
- Illumination;
- Photoabsorption;
- Ultrashort Pulsed Lasers;
- Atomic Energy Levels;
- Ground State;
- Partial Differential Equations;
- Pulse Repetition Rate;
- Lasers and Masers