Ultrafast all-fiber based cylindrical-vector beam laser

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openAccess

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Date

2017-01-09

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en

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5

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Applied Physics Letters, Volume 110, issue 2

Abstract

Cylindrical-vector beams (CVBs) with axial symmetry in polarization and field intensity are gathering increasing attention from fundamental research to practical applications. However, a majority of the CVBs are generated by modulating light beams in free space, and the temporal durations are far away from the ultrafast regime. Here, an ultrafast all-fiber based CVB laser is demonstrated via intermodal coupling in two mode fibers. In the temporal domain, chirp-free pulses are formed with combined actions of the ultrafast saturable absorption, self-phase modulation, and anomalous dispersion. In the spatial domain, the lateral offset splicing technique and a two mode fiber Bragg grating are adopted to excite and extract CVBs, respectively. The ultrafast CVB has an annular profile with a duration of 6.87 ps and a fundamental repetition rate of 13.16 MHz, and the output polarization status is switchable between radially and azimuthally polarized states. This all-fiber-based ultrafast CVB laser is a simple, low-cost source for diversified applications of nanoparticle manipulation, high-resolution imaging, material processing, spatiotemporal nonlinear optics, etc.

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Mao, D, Feng, T, Zhang, W, Lu, H, Jiang, Y, Li, P, Jiang, B, Sun, Z & Zhao, J 2017, ' Ultrafast all-fiber based cylindrical-vector beam laser ', Applied Physics Letters, vol. 110, no. 2, 021107 . https://doi.org/10.1063/1.4973922