Abstract

We propose a dynamic scheme to realize mode-switchable generation of LP11a/b modes and ±1-order orbital angular momentum (OAM) modes simultaneously, which are induced by an acoustically induced fiber grating driven by radio frequency modulation. LP11a/b mode degeneration in a few-mode fiber is induced by the geometric irregularity of optical fibers. A dual-wavelength resonance of mode coupling from LP01 to LP11a/b modes is found based on the combined effects of optical and acoustic birefringence. Within the configuration of continuous-wave intra-cavity laser output, we experimentally demonstrate a fast-switchable generation of LP11a/b modes and optical vortex beams with ±1-order OAM at a switching speed up to 4.3 kHz. This approach has potential applications in mode-division multiplexing, particle manipulation, stimulated emission depletion microscopy, and quantum information science.

© 2018 Optical Society of America

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Supplementary Material (2)

NameDescription
» Visualization 1       This vedio is about mode switching between LP11a and LP11b using our dual-peak resonant AIFG mode converter.
» Visualization 2       This vedio is about the interference patterns of mode switching between +1-order optic vortex beam and -1-order optic vortex beam using our dual-peak resonant AIFG mode converter. The Gaussian interference pattern indicates turning off the signal.

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