A bright green photoluminescence from 4S3/2→4I15/2 emission band in Er3+:YVO4 single crystal has been observed with the excitation of argon laser at 488 nm (See Fig.1a).
Because of the multicomponent structure,nonlinear localized waves in multicomponent coupled system whose dynamics can be governed by the well-known Coupled nonlinear Schr(o)dinger equation (CLSE) have
The role and conservation of orbital angular momentum (OAM) of light fields in nonlinear processes are interesting and important scientific topics.For most cases,the total OAM of the involved fields i