Optical frequency conversion of light with maintaining polarization and orbital angular momentum
Zhi‐Cheng Ren, Yan-Chao Lou, Zi-Mo Cheng, Li Fan, Jianping Ding, Xi‐Lin Wang, Hui‐Tian Wang
Abstract
Optical frequency conversion provides a fundamental and important approach to manipulate light in frequency domain. In such a process, manipulating the frequency of light without changing information in other degrees of freedom of light will enable us to establish an interface between various optical systems operating in different frequency regions and have many classical and quantum applications. Here we experimentally demonstrate a frequency conversion with maintaining polarization and orbital angular momentum (OAM) by successfully upconverting various polarization-OAM composite states in a nonlinear Sagnac interferometer. Our scheme offers a new possibility for building different wave band interfaces in more degrees of freedom.