title: Measuring OAM states of light beams with gradually-changing-period gratings.
abstract: A method to measure orbital angular momentum (OAM) states of light beams by using gradually-changing-period gratings is reported. Two kinds of gradually-changing-period gratings were used for the measurement of OAM states. The OAM states of the incident beam can be measured easily from the Hermite-Gaussian-like diffraction patterns. The simulation results agree well with the experiments.
authors: Kunjian
authors: K
authors: Dai
authors: Chunqing
authors: C
authors: Gao
authors: Lei
authors: L
authors: Zhong
authors: Quanxin
authors: Q
authors: Na
authors: Qing
authors: Q
authors: Wang