Frequency-resolved measurement of the orbital angular momentum spectrum of femtosecond ultra-broadband optical-vortex pulses based on field reconstruction
Frequency-resolved measurement of the orbital angular momentum spectrum of femtosecond ultra-broadband optical-vortex pulses based on field reconstruction
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DOI：
10.1088/1367-2630/16/5/053020
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发表时间：
2014-05-07
影响因子：
3.3
通讯作者：
Morita, Ryuji
中科院分区：
文献类型：
--
作者：
Yamane, Keisaku;Yang, Zhili;Morita, Ryuji
提出了一种高精度测量超宽带光涡旋（OV）脉冲轨道角动量（OAM）谱的方法，该方法利用OV脉冲与参考平面波脉冲的叉形干涉图测量OV脉冲的轨道角动量谱。它是基于从频率分辨的干涉图案的待测量的脉冲的电场的空间重构。我们的方法是实验证明通过获得OAM光谱的OV脉冲的不同光谱分量，使我们能够通过一个简单的实验装置来表征的OAM光谱的拓扑电荷的频率色散。检索进行准实时，使我们能够动态地调查OAM光谱。此外，我们确定的相对相位（包括符号）的拓扑电荷分辨电场振幅，这是重要的评估OV或OV脉冲与任意叠加模式。
We propose a high-precision method for measuring the orbital angular momentum (OAM) spectrum of ultra-broadband optical-vortex (OV) pulses from fork-like interferograms between OV pulses and a reference plane-wave pulse. It is based on spatial reconstruction of the electric fields of the pulses to be measured from the frequency-resolved interference pattern. Our method is demonstrated experimentally by obtaining the OAM spectra for different spectral components of the OV pulses, enabling us to characterize the frequency dispersion of the topological charge of the OAM spectrum by a simple experimental setup. Retrieval is carried out in quasi-real time, allowing us to investigate OAM spectra dynamically. Furthermore, we determine the relative phases (including the sign) of the topological-charge-resolved electric-field amplitudes, which are significant for evaluating OVs or OV pulses with arbitrarily superposed modes.