Yao Yunhua, Zhang Shian, Zhang Hui, Ding Jingxin, Jia Tianqing, Qiu Jianrong, Sun Zhenrong
State Key Laboratory of Precision Spectroscopy, and Department of Physics, East China Normal University, Shanghai 200062, China.
Institute of Science, Information Engineering University, Zhengzhou 450001, China.
Sci Rep. 2014 Dec 3;4:7295. doi: 10.1038/srep07295.
We theoretically and experimentally demonstrate the up-conversion fluorescence control via resonance-mediated two-photon absorption in rare-earth ions by varying both the laser polarization and phase. We show that both the laser polarization and phase can control the up-conversion fluorescence, and the up-conversion fluorescence intensity is decreased when the laser polarization changes from linear through elliptical to circular. We also show that the laser polarization will affect the control efficiency of the up-conversion fluorescence by varying the laser phase, and the circular polarization will reduce the control efficiency. Furthermore, we suggest that the control efficiency by varying the laser polarization and the effect of the laser polarization on the control efficiency by varying the laser phase can be artificially manipulated by controlling the laser spectral bandwidth. This optical control method opens a new opportunity to control the up-conversion fluorescence of rare-earth ions, which may have significant impact on the related applications of rare-earth ions.
我们通过改变激光偏振和相位，从理论和实验上证明了在稀土离子中通过共振介导的双光子吸收实现上转换荧光控制。我们表明，激光偏振和相位均可控制上转换荧光，并且当激光偏振从线性经椭圆变为圆偏振时，上转换荧光强度会降低。我们还表明，激光偏振会通过改变激光相位来影响上转换荧光的控制效率，而圆偏振会降低控制效率。此外，我们提出，通过控制激光光谱带宽，可以人为地操纵通过改变激光偏振实现的控制效率以及激光偏振通过改变激光相位对控制效率的影响。这种光学控制方法为控制稀土离子的上转换荧光开辟了新的机会，这可能会对稀土离子的相关应用产生重大影响。
