An all-fiberized, mode-locked thulium-doped laser was demonstrated using single-walled carbon nanotubes (SWCNTs) as the saturable absorber (SA). These SWCNTs were prepared by pyrolyzing tripropylamine confined in the one-dimensional nanochannels of zeolite ZnAPO-5 (AFI) single crystal and then the SWCNTs@AFI SA was transferred onto the end face of fiber connector. By inserting the SA into the fiber laser cavity, stable mode-locked solitons with 810 fs pulse width, 14.12 MHz repetition rate centered at 1913.6 nm was generated, the laser output showed the long-term stability and high signal-to-noise ratio. The experimental results confirmed that the SWCNTs@AFI could be an effective candidate as saturable absorption material for passively generating ultrafast pulses in 2 μm laser systems. This is, to the best of our knowledge, the first demonstration of SWCNTs@AFI SA in fiber lasers at 2 μm.
Ning Jiang,Hongwei Chu,Zhongben Pan,Han Pan,Shengzhi Zhao,Dechun Li
Low-dimensional lead halide perovskites demonstrate remarkable nonlinear optical characteristics attributed to their distinctive physical structures and electronic properties. Nevertheless, the investigation into their nonlinear optical properties remains in its incipient stages. This study addresses this gap by precisely controlling solvent volumes to synthesize both 0D Cs 4 PbBr 6 and Cs 4 PbBr 6 /CsPbBr 3 perovskites. Remarkably, as saturable absorbers, both pure Cs 4 PbBr 6 and Cs 4 PbBr 6 /CsPbBr 3 composites exhibit favorable nonlinear optical properties within the C-band, showcasing modulation depths of 9.22% and 16.83%, respectively. Moreover, for the first time, Cs 4 PbBr 6 and Cs 4 PbBr 6 /CsPbBr 3 composites have been successfully integrated into erbium-doped fiber lasers to realize the mode-locking operations. The utilization of the Cs 4 PbBr 6 /CsPbBr 3 composites as a saturable absorber that enables the generation of conventional soliton mode-locked laser pulses with a pulse duration of 688 fs, and a repetition frequency of 10.947 MHz at a central wavelength of 1557 nm. Cs 4 PbBr 6 is instrumental in generating laser pulses at a frequency of 10.899 MHz, producing pulse widths of 642 fs at the central wavelength of 1531.2 nm and 1.02 ps at the central wavelength of 1565.3 nm, respectively. The findings of this investigation underscore the potential utility of 0D Cs 4 PbBr 6 and Cs 4 PbBr 6 /CsPbBr 3 composites as promising materials for optical modulation within fiber laser applications.
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