title: Optical vortex generation with wavelength tunability based on an acoustically-induced fiber grating.
abstract: We presented a method to actualize the optical vortex generation with wavelength tunability via an acoustically-induced fiber grating (AIFG) driven by a radio frequency source. The circular polarization fundamental mode could be converted to the first-order optical vortex through the AIFG, and its topological charges were verified by the spiral pattern of coaxial interference between the first-order optical vortex and a Gaussian-reference beam. A spectral tuning range from 1540 nm to 1560 nm was demonstrated with a wavelength tunability slope of 4.65 nm/kHz. The mode conversion efficiency was 95% within the whole tuning spectral range.
authors.forename: Wending
authors.initials: W
authors.lastname: Zhang
authors.forename: Keyan
authors.initials: K
authors.lastname: Wei
authors.forename: Ligang
authors.initials: L
authors.lastname: Huang
authors.forename: Dong
authors.initials: D
authors.lastname: Mao
authors.forename: Biqiang
authors.initials: B
authors.lastname: Jiang
authors.forename: Feng
authors.initials: F
authors.lastname: Gao
authors.forename: Guoquan
authors.initials: G
authors.lastname: Zhang
authors.forename: Ting
authors.initials: T
authors.lastname: Mei
authors.forename: Jianlin
authors.initials: J
authors.lastname: Zhao