矢量结构光的空间偏振无关参量上转换
Spatial polarization independent parametric upconversion of vectorially structured light
摘要：
空间偏振无关（SPI）参量转换是许多光学应用的基础，如矢量模式通信信道的SPI频率接口和偏振分辨成像的上转换检测。然而，实现这种转换仍然是一个挑战。在这个原理证明的工作中，我们证明了SPI参数上转换使用偏振Sagnac非线性干涉仪的基础上，II型二次谐波产生（SHG）。结果表明，矢量信号光的矢量（包括偏振和强度）分布和相应的SOC态可以高保真地转换为倍频光。该原理为基于矢量模式的量子/经典通道SPI频率接口奠定了基础，也为中/远红外偏振分辨成像的上转换探测奠定了基础。
英文摘要：
Spatial polarization independent (SPI) parametric conversion is the basis of many optical applications, such as SPI frequency interface for communication channels carried by vector modes and upconversion detection for polarization-resolved imaging. However, realizing such conversion remains a challenge. In this proof-of-principle work, we demonstrated SPI parametric upconversion using a polarization Sagnac nonlinear interferometer based on type-II second-harmonic generation (SHG). Our results show that the vector (including both polarization and intensity) profile and associated SOC state of the vector signal beam could be transferred to the SHG beam with a high fidelity. The principle lays a foundation of SPI frequency interface for quantum/classical channels based on vector modes and also paves the way for upconversion detection of polarization-resolved imaging in Mid-/far-infrared region.
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