[29] P Jacquinot. New developments in interference spectroscopy. Rep Prog Phys, 23, 267-312(1960).
[31] L G Gouy. Surune PropriÉTÉNouvelle Des Ondes Lumineuses(1890).
[32] WeiS BEarlS KYuanX CKouS SLinJActive sorting of orbital angular momentum states of light with cascaded tunable resonators (2017)https://arxiv.org/abs/1704.01703.
[33] A E Siegmann. Lasers(1986).
[34] D L Andrews, M Babiker. The Angular Momentum of Light, 379-382(2012).