随机电报过程引起的光失相的计算机模拟

动态微扰可以引起跃迁频率发生变化,产生光谱扩散,我们用Monte Carlo法模拟了由于频率变化引起的自由感应衰减和光子回波衰减。模拟的结果表明,衰减的线形只和频率变化与跳变速率的比值有关,根据它的不同取值,自由感应衰减呈指数和非指数形式,光子回波强度为exp-(4τ/tm)^x],x取值从1到3。我们还定性地讨论了红宝石中光子回波的非指数衰减。

MONTE CARLO SIMULATION OF OPTICAL DEPHASING OF RANDOM TELEGRAPH PROCESs

Monte Carlo simulation has been carried out to get the free induction decay and photon echo decay for a system of A spins, isolated from each other, whose resonant frequency fluctuates because of the flipping of a surrounding B spins. We find that the decay line shape is dependent only on k, the ratio of the frequency fluctuation amplitude and twice of the average flip rate. The simulated photon echo decay can be expressed asexp-(4τ/tm)x] where x ranges from 1 to 3. Nonexponential echo decay in ruby is alsodiscussed qualitatively.