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Towards an optimum saturable absorber for the multi-gigahertz harmonic mode locking of fiber lasers 被引量:5
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作者 JAKUB BOGUSLAWSKI GRZEGORZ SOBON +1 位作者 RAFALZYBALA jaroslaw sotor 《Photonics Research》 SCIE EI CSCD 2019年第9期1094-1100,共7页
Ultra-high-pulse-repetition-rate lasers are essential for a number of applications, including, e.g., optical communication and ablation-cooled material processing. Despite several techniques to generate pulses with gi... Ultra-high-pulse-repetition-rate lasers are essential for a number of applications, including, e.g., optical communication and ablation-cooled material processing. Despite several techniques to generate pulses with gigahertzrange repetition rate, incorporating mainly short-length resonators, more widespread applications are still limited by the lack of a robust, simple, and cost-effective solution. Here, we report for the first time, to the best of our knowledge, fully passive harmonic mode locking in an all-polarization-maintaining(PM) fiber laser. The design guarantees a fixed polarization state and stable operation, where the cavity harmonic number is controlled by the pump power only. Self-starting operation is provided by the antimony telluride(Sb2Te3) thin-film saturable absorber(SA), which facilitates multiple pulse operation. The SA acts by means of low modulation depth, low saturation fluence, and an inverse slope in the saturable absorption curve. The optimum features of the SA and limiting factors for high-repetition-rate pulse generation in this regime of operation are discussed. As a result, 2.2 ps pulses with 3 GHz repetition rate are generated at 1560 nm wavelength. The study reports a new approach towards an optimal SA for multi-gigahertz pulse generation in practical, all-PM fiber lasers. 展开更多
关键词 SA TOWARDS AN OPTIMUM saturable absorber for the multi-gigahertz HARMONIC mode locking of fiber lasers
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Graphene oxide paper as a saturable absorber for Er-and Tm-doped fiber lasers 被引量:5
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作者 Jakub Boguslawski jaroslaw sotor +5 位作者 Grzegorz Sobon Rafal Kozinski Krzysztof Librant Magdalena Aksienionek Ludwika Lipinska Krzysztof MAbramski 《Photonics Research》 SCIE EI 2015年第4期119-124,共6页
In this work pulse generation in both the 1.5 and 2 μm spectral ranges using a graphene oxide(GO)-paper-based saturable absorber in Er-and Tm-doped fiber lasers is presented. The article describes the fabrication met... In this work pulse generation in both the 1.5 and 2 μm spectral ranges using a graphene oxide(GO)-paper-based saturable absorber in Er-and Tm-doped fiber lasers is presented. The article describes the fabrication method of GO paper and its characterization. The performance of both lasers is discussed in detail. Stable, mode-locked operation provides 613 fs and 1.36 ps soliton pulses centered at 1565.9 and 1961.6 nm in Er-and Tm-doped fiber lasers, respectively. Furthermore, scaling of spectral width, and hence the pulse duration, by increasing the number of GO paper layers in the Er-doped laser is described. The versatility and simplicity of GO paper fabrication combined with the possibility of scaling the optical spectrum full width at half-maximum are essential features that make it a good candidate for ultrafast low-power mode-locked lasers operating in different spectral regions. 展开更多
关键词 GO Graphene oxide paper as a saturable absorber for Er and Tm-doped fiber lasers Tm
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Ultrabroadband wavelength-swept source based on total mode-locking of an Yb:CaF_(2)laser 被引量:2
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作者 MACIEJ KOWALCZYK TADEUSZ MARTYNKIEN +2 位作者 PAWEL MERGO GRZEGORZ SOBON jaroslaw sotor 《Photonics Research》 SCIE EI CSCD 2019年第2期182-186,共5页
We present an ultrabroadband, high-speed wavelength-swept source based on a self-modulated femtosecond oscillator. Photonic crystal fiber was pumped by a mode-locked Yb:CaF2 laser, resulting in a strong spectral broad... We present an ultrabroadband, high-speed wavelength-swept source based on a self-modulated femtosecond oscillator. Photonic crystal fiber was pumped by a mode-locked Yb:CaF2 laser, resulting in a strong spectral broadening from 485 to 1800 nm. The pump laser cavity could be realigned in order to achieve total mode-locking of the longitudinal and transverse TEM00 and TEM01 electromagnetic modes. This led to spatial oscillations of the output beam, which induced modulation of the coupling efficiency to the fiber. Due to the fact that nonlinear spectral broadening was intensity dependent, this mechanism introduced wavelength sweeping at the fiber output. The sweeping rate could be adjusted between 7 and 21.5 MHz by changing the geometry of the pump cavity. By controlling the ratio of the transverse mode amplitudes, we were able to tune the sweeping bandwidth, eventually covering both the 1300 nm and 1700 nm bioimaging transparency windows. When compared with previously demonstrated wavelength-swept sources, our concept offers much broader tunability and higher speed. Moreover,it does not require an additional intensity modulator. 展开更多
关键词 Ultrabroadband wavelength-swept SOURCE
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Generation of sub-100 fs pulses tunable from 1700 to 2100 nm from a compact frequency-shifted Er-fiber laser 被引量:4
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作者 GRZEGORZ SOBON TADEUSZ MARTYNKIEN +2 位作者 KAROL TARNOWSKI PAWEL MERGO jaroslaw sotor 《Photonics Research》 2017年第3期151-155,共5页
We report generation of sub-100 fs pulses tunable from 1700 to 2100 nm via Raman soliton self-frequency shift.The nonlinear shift occurs in a highly nonlinear fiber, which is pumped by an Er-doped fiber laser. The who... We report generation of sub-100 fs pulses tunable from 1700 to 2100 nm via Raman soliton self-frequency shift.The nonlinear shift occurs in a highly nonlinear fiber, which is pumped by an Er-doped fiber laser. The whole system is fully fiberized, without the use of any free-space optics. Thanks to its exceptional simplicity, the setup can be considered as an alternative to mode-locked Tm-and Ho-doped fiber lasers. 展开更多
关键词 of as be Generation of sub-100 fs pulses tunable from 1700 to 2100 nm from a compact frequency-shifted Er-fiber laser in NM from
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