掺杂稀土离子晶体中的电磁感应光透明现象

对在掺杂稀土离子晶体中实现电磁感应光透明进行了实验研究。首先,以Er3＋∶YAG晶体为样品,用旋转波近似下的密度矩阵方程理论计算了探测场的吸收特性随Er3＋离子浓度的变化规律,结果表明：在探测场失谐Δp=0时,形成了一个对于探测光透明的窗口,从而在理论上论证了在掺杂稀土离子晶体中实现电磁感应光透明效应的可行性。设计了一个以Pr3＋∶Y2SiO5晶体为样品的实验激发方案,吸收光谱显示,当温度为6 K时其在共振吸收峰处可形成一个完全透明的窗口,实现了在掺杂离子晶体中的电磁感应光透明。实验还分析了工作温度、耦合场失谐对探测光透过率的影响,结果显示：当样品温度上升到15 K时,透明窗口消失;耦合场的失谐量越大,透射率越小。

Electromagnetically induced transparency in crystals doped with rare-earth ions

The Electromagnetically Induced Transparency（EIT） in crystals doped with rare-earth ions was researched.By taking a Er3＋∶ YAG crystal for a sample,the probe field absorption as a function of the concentration of Er3＋ ions was calculated by using density matrix equations in rotating-wave approximation.It indicates that when the detuning of the probe field Δp is 0,the transparency window of a probe field is generated,which demonstrates the feasibility to achieve the EIT in crystals doped with rare-earth ions.Furthermore,an excitation scheme for Pr3＋∶ Y2SiO5 was performed,and it experimentally exhibits that when the temperature is 6 K,a 100% transparency window in the resonant absorption peak is formed in the absorption spectrum of Pr3＋∶ Y2SiO5,and the EIT phenomenon in crystals doped with rare-earth ions is realized.In addition,the dependence of temperature and coupling field detuning on the EIT was presented.It is found that when the temperature increases to 15 K,the transparency window disappears,while the detuning of coupling field becomes larger and the transparency window gets smaller.