【作者】 掌蕴东； 范保华； 袁萍；

【Author】 Zhang Yun-Dong* Fan Bao-Hua Yuan Ping (Harbin Institute of Technology, Institute of Opto-electronics, Harbin, 150001, China)

【机构】 哈尔滨工业大学光电子技术研究所；

【摘要】 在室温条件下利用单光束泵浦在紫翠宝石晶体中实现了光谱烧孔效应。这种由于基态粒子受周期性的调制而产生的光谱烧孔导致晶体的群速折射率急剧增大从而实现介质中的极慢光速。通过实验证明:介质中光传输的群速度与激光的调制频率、激光光功率以及晶体的晶格方向有关。调制频率越低、激光功率越高,介质中的光速越慢。更多还原

【Abstract】 We have observed a hole in the absorption profile of the homogeneously broadened absorption band of an Alexandrite crystal. With the spectral hole-burning technique that resulting from the periodic modulation of the ground state population at the beat frequency between the pump and the probe fields,we observed the slowdown of the light propagation with the group velocity as slow as 12.5m/s at room temperature. And the group velocity in the crystal depends on the amplitude modulation frequency, the power of input laser and the orientation of the crystal lattice. The lower frequency or higher power leads to slower group velocity of light.更多还原