Kavli Affiliate: Wei Gao
| First 5 Authors: Wei Gao, Dong-Mei Wang, Hai-Jun Wu, Dong-Sheng Ding, Carmelo Rosales-Guzmán
| Summary:
Abruptly autofocusing waves and associated ring-Airy (RA) beams are
attracting increasing interest owing to their advantages in focusing abruptness
and small F-number. Optical frequency conversion via parametric interactions
can further expand their application areas, yet are rarely studied. In this
work, we report the frequency conversion of RA beams, where the RA signal was
upconverted via sum-frequency generation using perfect flattop and common Gauss
beams as pumps, respectively. The nonlinear transformation of the spatial
complex amplitude of the signal and associated influences on autofocusing
behavior, under different conditions of interaction location (i.e., original,
autofocusing, and Fourier planes) and pump structure, were systematically
studied and experimentally investigated. This proof-of principle demonstration
provides a general guideline to build the frequency interface for abruptly
autofocusing waves and a reference for relevant studies involving nonlinear
transformation of abruptly autofocusing waves.
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