Cerdán Luis, García-Moreno Sara, Costela Angel, García-Moreno Inmaculada, de la Moya Santiago
Instituto de Química Física "Rocasolano" (IQFR), Consejo Superior de Investigaciones Científicas (CSIC), C/Serrano 119, 28006, Madrid (Spain).
Departamento de Química Orgánica I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid (UCM), Ciudad Universitaria S/N, 28040, Madrid (Spain).
Sci Rep. 2016 Jun 28;6:28740. doi: 10.1038/srep28740.
The production of efficient, tunable, and switchable circularly polarized laser emission would have far reaching implications in optical communications or biophotonics. In this work, it is demonstrated the direct generation of circularly polarized (CP) laser emission in achiral and isotropic dye laser systems without the use of extracavity polarizing elements, and without resorting to chiral dyes, chiral liquid crystal matrices, or interferometric methods. The origin of this ellipticity arises from the dynamic birefringence induced by the strong and polarized laser pumping and the subsequent orientation anisotropy of the excited molecular dipoles. A complete polarimetric characterization of the polarization state of conventional dye laser oscillators as a function of different experimental parameters is performed and it is shown that the generated light always possesses a certain level of circularity that changes in a distinctive way with pump energy and polarization. These results demonstrate that it is possible to generate and modulate CP laser light from efficient and photostable conventional laser dyes.
高效、可调谐且可切换的圆偏振激光发射的产生在光通信或生物光子学中具有深远意义。在这项工作中，证明了在手性和各向同性染料激光系统中，无需使用腔外偏振元件，也无需借助手性染料、手性液晶矩阵或干涉测量方法，即可直接产生圆偏振（CP）激光发射。这种椭圆率的起源来自于强偏振激光泵浦引起的动态双折射以及激发分子偶极子随后的取向各向异性。对传统染料激光振荡器的偏振态作为不同实验参数的函数进行了完整的偏振特性表征，结果表明所产生的光始终具有一定程度的圆度，该圆度会随着泵浦能量和偏振以独特的方式变化。这些结果表明，利用高效且光稳定的传统激光染料来产生和调制CP激光是可能的。
