Abstract
We reported that the photonic crystal fiber (PCF) filled with TI:Bi2Te3 nanosheets solution could act as an effective saturable absorber (SA). Employing this TI-PCF SA device; we constructed an ytterbium-doped all-fiber laser oscillator and achieved the evanescent wave mode-locking operation. Due to the large cavity dispersion; the fundamental mode-locking pulse had the large full width at half maximum (FWHM) of 2.33 ns with the repetition rate of ~1.11 MHz; and the radio frequency (RF) spectrum with signal-to-noise ratio (SNR) of 61 dB. In addition; the transition dynamics from a bunched state of pulses to harmonic mode-locking (HML) was also observed; which was up to 26th order.
Highlights
In the past decade, passively mode-locked fiber lasers have been extensively investigated due to its simplicity and compactness [1,2,3]
Most of the previous works on harmonic mode locking (HML) were related to the nonlinear polarization rotation (NPR) [6,7,8,9] and nonlinear amplifying mirrors (NALMs) technique [10]
Mode-locked fiber lasers based on NPR and the NALM technique are intrinsically environmentally unstable
Summary
Passively mode-locked fiber lasers have been extensively investigated due to its simplicity and compactness [1,2,3]. Grapheme powder [18] and nanoscale charcoal powder [19] were employed as nano-scale saturable absorbers effectively achieve mode-locked Another new type of Dirac material, topological insulators (TIs), which have become one of the most interesting research topics in condensed-matter physics [20,21]. It has been demonstrated that introducing proper high nonlinear effect into the laser cavity was favorable for generating harmonic mode locking (HML) pulses [27]. We reported that the PCF filled with TI:Bi2Te3 nanosheets solution could act as an effective SA Employing this TI-PCF SA device, we constructed an ytterbium-doped all-fiber laser oscillator and achieved the evanescent wave mode-locking operation. Fundamental mode-locking and harmonic mode-locking (HML) up to 26th order were demonstrated
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