[1] A EINSTEIN. On the quantum theory of radiation. Physikalische Zeitschrift, 18, 121-128(1917).
[21] L MARRUCCI. The q-plate and its future. Journal of Nanophotonics, 7, 078598(2013).
[52] D WEI, P CHEN, X HU et al. Generations of high efficiency, purityhigh, and broadband Laguerre-Gaussian modes from a Janus optical parametric oscillator, arXiv, 2004.12384(2020).
[60] P MIAO, Z ZHANG, J SUN et al. Orbital angular momentum microlaser. Science, 353, 464-467(2016).