Grzegorz Soboń

Wrocław University of Science and Technology

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Jarosław Sotor

Wrocław University of Science and Technology

126

Krzysztof M. Abramski

Wrocław University of Science and Technology

106

Karol Krzempek

Wrocław University of Science and Technology

Aleksandra Foltynowicz

Umeå University

Jakub Bogusławski

Wrocław University of Science and Technology

Tadeusz Martynkien

Wrocław University of Science and Technology

Aleksander Głuszek

Wrocław University of Science and Technology

Paweł Mergo

Maria Curie-Skłodowska University

Isak Silander

Umeå University

Paweł Kaczmarek

Wrocław University of Science and Technology

Cooperative Institutions

Wrocław University of Science and Technology

AGH University of Krakow

Warsaw University of Technology

Institute of Electronic Materials Technology

University of Warsaw

Centre National de la Recherche Scientifique

Institute of Physics

Polish Academy of Sciences

Łukasiewicz Research Network

Umeå University

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Amplification of noise-like pulses generated from a graphene-based Tm-doped all-fiber laser

Optics Express (2016)

Grzegorz Soboń Jarosław Sotor Aleksandra Przewolka Iwona Pasternak Włodek Strupiński

We report on the generation of noise-like pulse (NLP) trains in a Tm-doped fiber laser mode-locked by multilayer graphene saturable absorber. The spectral bandwidth obtained directly from the oscillator exceeds 60 nm, centered at 1950 nm, with 23.5 MHz repetition rate. The pulses were also amplified in a fully fiberized amplifier based on a double-cladding Tm-doped fiber. The system was capable of delivering 1.21 W of average power, which corresponds to 51.5 nJ energy stored in the noise-like bundle. We believe that the presented source might serve as a pump for supercontinuum generation in highly nonlinear fibers.

Supercontinuum

Saturable absorption

Mode-Locking

10.1364/oe.24.020359

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Citations (67)

Harmonically mode-locked Er-doped fiber laser based on a Sb₂Te₃topological insulator saturable absorber

Laser Physics Letters (2014)

Jarosław Sotor Grzegorz Soboń Wojciech Macherzyński Krzysztof M. Abramski

In this letter we present for the first time, to the best of our knowledge, a harmonically mode-locked Er-doped fiber laser with antimony telluride (Sb2Te3) topological insulator material used as a saturable absorber (SA). The SA was prepared via mechanical exfoliation of the bulk material. The 80 nm thick Sb2Te3 layers transferred onto fiber ferrule entirely cover the fiber core. The Er-doped fiber mode-locked laser based on such SA generated optical pulses was centered at 1558 nm with 1.9 ps duration and a fundamental repetition rate of 3.75 MHz. Increasing the pump power results in stable harmonic mode-locked operation up to the 81st harmonic at 304 MHz repetition frequency. The laser was capable of generating optical solitons with 2.2 ps duration. The number of generated harmonics could be tuned only by changing the pump power injected into the laser cavity.

Saturable absorption

Topological insulator

Mode (computer interface)

10.1088/1612-2011/11/5/055102

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Citations (140)

Dispersion management of a nonlinear amplifying loop mirror-based erbium-doped fiber laser

Optics Express (2020)

Zbigniew Łaszczych Grzegorz Soboń

We report an investigation of dispersion management of an all-polarization-maintaining Er-fiber oscillator mode-locked via a nonlinear amplification loop mirror in a figure-nine cavity configuration with two output ports. The performance of the laser was investigated within the net cavity dispersion ranging from −0.034 ps 2 to +0.006 ps 2 . We show that the spectral and temporal phase of the pulses at both figure-nine outputs have clearly different characteristics. One of the laser outputs provides pulses with significantly better quality; nonetheless, the rejection output also offers ultrashort pulses with broad spectra. Pulses as short as 79 fs with an energy of 83 pJ were generated directly from the laser in the near-zero dispersion regime.

Erbium

Mode-Locking

10.1364/oe.416107

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Citations (27)

Stabilized all-fiber source for generation of tunable broadband fCEO-free mid-IR frequency comb in the 7 – 9 µm range

Optics Express (2019)

Karol Krzempek Dorota Tomaszewska Aleksander Głuszek Tadeusz Martynkien Paweł Mergo

A compact and robust all-fiber difference frequency generation-based source of broadband mid-infrared radiation is presented. The source emits tunable radiation in the range between 6.5 µm and 9 µm with an average output power up to 5 mW at 125 MHz repetition frequency. The all-in-fiber construction of the source along with active stabilization techniques results in long-term repetition rate stability of 3 Hz per 10 h and a standard deviation of the output power better than 0.8% per 1 h. The applicability of the presented source to laser spectroscopy is demonstrated by measuring the absorption spectrum of nitrous oxide (N2O) around 7.8 µm. The robustness and good long- and short-term stability of the source opens up for applications outside the laboratory.

10.1364/oe.27.037435

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Citations (25)

Shot-to-shot performance analysis of an all-fiber supercontinuum source pumped at 2000 nm

Journal of the Optical Society of America B (2018)

Grzegorz Soboń Robert Lindberg Valdas Pašiškevičius Tadeusz Martynkien Jarosław Sotor

In this paper, we report an all-fiber supercontinuum source pumped with ultra-short pulses at 1.9–2.0 μm, covering over an octave (1200–2400 nm). We investigated the shot-to-shot stability of the supercontinuum generated in a commercially available highly nonlinear fiber (HNLF) of different lengths, ranging from 5 to 80 cm, by employing the dispersive Fourier transform method. Our study shows that using shorter HNLFs significantly improves the shot-to-shot stability while maintaining the broad spectral coverage. The supercontinuum generated in HNLFs shorter than 10 cm is characterized by excellent stability despite the anomalous-dispersion characteristic of the fiber. The presented source is characterized by exceptional simplicity, showing readiness for outside-of-lab applications.

Supercontinuum

10.1364/josab.36.000a15

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Citations (11)

A graphene-based mode-locked nano-engineered zirconia–yttria–aluminosilicate glass-based erbium-doped fiber laser

Laser Physics (2013)

Mukul Chandra Paul Grzegorz Soboń Jarosław Sotor Krzysztof M. Abramski Jakub Jagiełło

We demonstrate a simple, compact and low cost graphene-based mode-locked nano-engineered erbium-doped zirconia–yttria–aluminosilicate (ZYA-EDF) glass-based fiber laser. The fiber preform in a quaternary glass host of silica–zirconia–yttria–aluminum was made through the modified chemical vapor deposition (MCVD) process followed by the solution doping technique. The core glass is made of 0.40 mol% of Al2O3, 3.0 mol% of ZrO2 and 0.25 mol% of Er2O3, which give rise to a peak absorption of 30.0 dB m−1 at 978 nm and a fluorescence lifetime of 10.65 ms. Such a doping host provides the high concentration of erbium ions of 4500 ppm without any clustering. Such an active fiber was used as a gain medium for an ultra-fast femtosecond fiber laser, mode locked by a graphene oxide (GO) saturable absorber. This paper describes geometrical and optical characterization of the nano-engineered glass-based erbium-doped optical fiber (ZYA-EDF) as well as the performance of the mode-locked femtosecond laser based on the developed fiber. The all-anomalous cavity laser generated soliton pulses with 8.5 nm bandwidth, 50 MHz repetition frequency and nearly transform-limited 400 fs duration at 1561 nm center wavelength using a new class of EDF.

Erbium

Saturable absorption

10.1088/1054-660x/23/3/035110

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Citations (15)

Graphene Oxide vs Reduced Graphene Oxide as saturable absorbers for Er-doped passively mode-locked fiber laser

Optics Express (2012)

Grzegorz Soboń Jarosław Sotor Joanna Jagiełło Rafał Koziński Mariusz Zdrojek

In this work we demonstrate comprehensive studies on graphene oxide (GO) and reduced graphene oxide (rGO) based saturable absorbers (SA) for mode-locking of Er-doped fiber lasers. The paper describes the fabrication process of both saturable absorbers and detailed comparison of their parameters. Our results show, that there is no significant difference in the laser performance between the investigated SA. Both provided stable, mode-locked operation with sub-400 fs soliton pulses and more than 9 nm optical bandwidth at 1560 nm center wavelength. It has been shown that GO might be successfully used as an efficient SA without the need of its reduction to rGO. Taking into account simpler manufacturing technology and the possibility of mass production, GO seems to be a good candidate as a cost-effective material for saturable absorbers for Er-doped fiber lasers.

Saturable absorption

Mode-Locking

10.1364/oe.20.019463

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Citations (370)

Mode-locking of fiber lasers using novel two-dimensional nanomaterials: graphene and topological insulators [Invited]

Photonics Research (2015)

Grzegorz Soboń

The paper summarizes the recent achievements in the area of ultrafast fiber lasers mode-locked with so-called low-dimensional nanomaterials: graphene, topological insulators (Bi2Te3, Bi2Se3, Sb2Te3), and transition metal sulfide semiconductors, like molybdenum disulfide (MoS2). The most important experimental achievements are described and compared. Additionally, new original results on ultrashort pulse generation at 1.94 μm wavelength using graphene are presented. The designed Tm-doped fiber laser utilizes multilayer graphene as a saturable absorber and generates 654 fs pulses at 1940 nm wavelength, which are currently the shortest pulses generated from a Tm-doped fiber laser with a graphene-based saturable absorber.

Topological insulator

Nanomaterials

10.1364/prj.3.000a56

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Citations (160)

Optimization of femtosecond pulses by AI-assisted spectral phase modulation: influence of spectral resolution

Alicja Kwaśny M. Krakowski Grzegorz Soboń

We investigate the possibility of optimization of ultrashort laser pulses by spectral phase modulation using machine learning algorithms. The Grey Wolf Algorithm is applied, and the efficiency of various spectral resolution patterns is examined.

Modulation (music)

Ultrafast optics

Self-phase modulation

10.1364/cleo_at.2024.jw2a.49

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Citations (0)

Multilayer graphene-based saturable absorbers with scalable modulation depth for mode-locked Er- and Tm-doped fiber lasers

Optical Materials Express (2015)

Grzegorz Soboń Jarosław Sotor Iwona Pasternak Aleksandra Krajewska Włodek Strupiński

We demonstrate an experimental study on the influence of the parameters of a graphene-based saturable absorber (SA) on the performance of mode-locked Er- and Tm-doped fiber lasers. We have fabricated a set of saturable absorbers with different number of graphene layers: 9, 12, 24, 37 and 48. Each SA was characterized in terms of nonlinear optical parameters (modulation depth, saturation intensity, saturation fluence) and tested in two state-of-the-art, low-power Er- and Tm-doped fiber lasers. Our results show, that in the Er-laser the broadest output spectrum (11 nm) and shortest pulses (345 fs) are generated using 37 layers of graphene in the SA. In case of a Tm-laser, the best performance (737 fs pulses with 5.82 nm bandwidth) was achieved with 24 layers. Additionally, we show that the modulation depth of a 9-layer SA is insufficient to initiate mode-locking in both lasers. This is the first reported comprehensive study on controlling of the parameters of a SA by scaling the number of graphene layers.

Saturable absorption

Mode-Locking

10.1364/ome.5.002884

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Citations (94)