Optical decoherence in eR3+-doped silicate fiber: evidence for coupled spin-elastic tunneling systems.
Optical decoherence in eR3+-doped silicate fiber: evidence for coupled spin-elastic tunneling systems.
复制标题
eR3 掺杂硅酸盐光纤中的光学退相干：耦合自旋弹性隧道系统的证据。
作者：
R. Macfarlane;Y. Sun;P. Sellin;R. Cone
我们测量的光学退相干时间T2，或等效地，均匀的线宽，在掺铒光纤在低温下作为外部磁场和温度的函数，使用双脉冲光子回波。在3T以上的磁场下，退相干时间可达230ns.由3 T的磁场引起的线变窄的幅度为2.5 MHz，这是非常大的相比，典型的氧化物晶体具有类似的Er 3+浓度。这被解释为退相耦合的自旋弹性隧穿模式，其中正常的玻璃隧穿模式通过耦合到Er 3+自旋获得磁特性的证据。
We measured the optical decoherence times T2, or, equivalently, the homogeneous line width, in an Er-doped optical fiber at low temperature as a function of external magnetic field and temperature using two-pulse photon echoes. The decoherence times were up to 230 ns at fields above 3 T. The magnitude of the line narrowing induced by a magnetic field of 3 T is 2.5 MHz, which is anomalously large compared to that typical for oxide crystals with similar Er3+ concentration. This is interpreted as evidence for dephasing by coupled spin-elastic tunneling modes where the normal glass tunneling modes acquire a magnetic character by coupling to the Er3+ spin.