Journal
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
Volume 24, Issue 3, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSTQE.2017.2761126
Keywords
Dual-wavelength; cylindrical vector beam; mode-locked fiber lasers; mode-selective coupler; carbon nanotubes
Categories
Funding
- National Science Foundation of Jiangsu Province [BK20161521, BK20150858]
- Nanjing University of Posts and Telecommunications [NY214059, NY214002, NY215002]
- Distinguished Professor Project of Jiangsu [RK002STP14001]
- Six Talent Peaks Project in Jiangsu Province [2015-XCL-023]
- Postgraduate Research and Practice Innovation Program of Jiangsu Province [SJCX17_0234, KYCX17_0744]
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Cylindrical vector beams (CVBs) with axial symmetry in both polarization and field intensity have attracted much attention because of their unique optical properties. Conventional methods to obtain CVBs including direct modulation of light beams in free space and high-order mode excitation by offset splicing single-mode fiber with few-mode fiber usually works at single wave length with rather narrow bandwidth. Here, for the first time to the best of our knowledge, we demonstrate switchable dual-wavelength CVB generation from a passively mode-locked fiber laser using carbon nanotubes as saturable absorber for mode-locking and a home-made mode-selective coupler as both mode converter and birefringence filter. In experiments, the mode-locked fiber laser delivers CVB pulses of dual-wavelength (1532.5 nm and 1555.5 nm) and corresponding single wavelength with duration of hundreds of femtosecond, respectively. Moreover, the output polarization status is switchable between radially and azimuthally polarized states. The mode-locked CVBs with wavelength and polarization flexibility may have potential applications in mode-division multiplexing optical fiber communication, nanoparticle manipulation, material processing, nonlinear optics, and so on.
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