Maciej Kowalczyk

AGH University of Krakow

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Jarosław Sotor

Wrocław University of Science and Technology

Valentin Petrov

Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy

Alexander Weigel

Max Planck Institute of Quantum Optics

Jakub Bogusławski

Wrocław University of Science and Technology

Ferenc Krausz

Ludwig-Maximilians-Universität München

Grzegorz Soboń

Wrocław University of Science and Technology

Xuzhao Zhang

Qingdao University of Science and Technology

Vladimir Pervak

Ludwig-Maximilians-Universität München

Pavel Loiko

Université de Caen Normandie

Zhengping Wang

Liaocheng University

Cooperative Institutions

Wrocław University of Science and Technology

AGH University of Krakow

Max Planck Institute of Quantum Optics

Ludwig-Maximilians-Universität München

Centre National de la Recherche Scientifique

Université de Caen Normandie

Centre de Recherche sur les Ions, les Matériaux et la Photonique

Institute of Physics

Universidad Rovira i Virgili

École Nationale Supérieure d'Ingénieurs de Caen

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Dual-dispersion-regime dual-comb mode-locked laser

Optics Letters (2022)

Maciej Kowalczyk Łukasz A. Sterczewski Xuzhao Zhang Valentin Petrov Jarosław Sotor

We report on the first, to the best of our knowledge, solid-state dual-comb mode-locked laser that simultaneously operates in different dispersion regimes. Due to the intrinsic polarization multiplexing in a birefringent Yb:Ca3NbGa3Si2O14 (Yb:CNGS) gain medium, the laser emits two cross-polarized pulse trains with a repetition rate offset of ∼ 4.8 kHz from a single cavity. We obtain dual pulse generation with a 20-fold difference in duration by setting the net cavity group delay dispersion to cross zero across the emission band of the employed gain medium. While the duration of the soliton-like pulses experiencing anomalous dispersion amounts to 117 fs, the second laser output, which is spectrally located in the normal dispersion region, is strongly chirped with a pulse duration of 2360 fs.

Pulse duration

10.1364/ol.453653

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Citations (1)

Inwentaryzacja geodezyjno-hydrogeologiczna studni gospodarskich oraz ognisk zanieczyszczeń w siedliskach wokół zbiornika "Żelazny Most"

Zeszyty Naukowe Akademii Rolniczej we Wrocławiu. Geodezja i Urządzenia Rolne (1991)

Maciej Kowalczyk N Malinowski J Szczurek

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Optical Microstructures Fabricated with Direct Laser Writing Technique

Latvian Journal of Physics and Technical Sciences (2014)

Maciej Kowalczyk Michał Nawrot Łukasz Zinkiewicz

Abstract Three-dimensional photolitography, also known as Direct Laser Writing (DLW), is a powerful technique for fabrication of photonic microstructures. In this paper we present the basics of the relevant technology and discuss some features of the fabrication process. We also describe the experimental setup designed for making colour filters based on diffraction gratings, fibre-tip-integrated lens and anti-reflective coating designed for telecom wavelength (1550 nm). The results obtained demonstrate the DLW technique to be a promising fast prototyping fabrication method that may allow manipulating the properties of optical materials.

Rapid Prototyping

10.2478/lpts-2014-0026

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Tm:GdVO4 microchip laser Q-switched by a Sb2Te3 topological insulator

Valentin Petrov Pavel Loiko Jakub Bogusławski Josep María Serres Esrom Kifle

We report on the first application of a topological insulator based on antimony telluride (Sb₂Te₃) as a saturable absorber (SA) in a bulk microchip laser. The transmission-type SA consisted of a thin film of Sb₂Te₃ (thickness: 3 nm) deposited on a glass substrate by pulsed magnetron sputtering. The saturable absorption of the Sb₂Te₃ film was confirmed for ns-long pulses. The microchip laser was based on a Tm:GdVO₄ crystal diode-pumped at ∼802 nm. In the continuous-wave regime, this laser generated 3.54 W at 1905-1921 nm with a slope efficiency η of 37%. The Q-switched laser generated a maximum average output power of 0.70 W at 1913 nm. The pulse energy and duration were 3.5 μJ and 223 ns, respectively, at a repetition rate of 200 kHz. The Sb₂Te₃ SAs are promising for passively Q-switched waveguide lasers at ∼2 μm.

Saturable absorption

Topological insulator

Q-switching

10.1117/12.2291132

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Ultrabroadband wavelength-swept source based on total mode-locking of an Yb:CaF₂ laser

Photonics Research (2019)

Maciej Kowalczyk Tadeusz Martynkien Paweł Mergo Grzegorz Soboń Jarosław Sotor

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.

Mode-Locking

10.1364/prj.7.000182

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Citations (11)

Investigation on dispersion regimes in Yb:KGW solid-state laser

Laser Physics Letters (2018)

Maciej Kowalczyk Jarosław Sotor

10.1088/1612-202x/aab82a

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Single-cycle CEP-stable Cr:ZnS lasers

EPJ Web of Conferences (2024)

Nathalie Lenke Philipp Steinleitner Maciej Kowalczyk Philipp Rosenberger Sebastian Gröbmeyer

We showcase a coherent infrared light source capable of producing single-cycle pulses with exceptional waveform stability. With ALBATROSS , a commercial solution is made available to chart new horizons in infrared spectroscopy and high-speed opto-electronics. © 2024 The Author(s)

10.1051/epjconf/202430704036

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Ultrastable and Ultrafast Mid-IR Laser Sources Based on a Cr:ZnS/ZnSe Laser Technology

Maciej Kowalczyk Karolina Suliga Nathalie Lenke Philipp Steinleitner Nicholas Karpowicz

Ultrafast optics

10.1109/cleo-pr60912.2024.10676526

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Bulk Supercontinuum Generation for Ultra-CEP-Stable Single-Cycle Pulses at $\upmu\mathrm{m}$

Philipp Steinleitner Maciej Kowalczyk Nathalie Nagl Nicholas Karpowicz Vladimir Pervak

Single-cycle laser pulses with a precisely controllable carrier-envelope phase (CEP) form the basis for studying fundamental light-matter interactions on the genuine attosecond time scale of the light's electric-field evolution. In the past, this paved the way for ground-breaking experiments, such as the generation of isolated attosecond pulses [1], or the sub-femtosecond manipulation of electric currents in solids [2]. Until recently, kHz-rate Ti:sapphire (Ti:Sa) amplified laser systems, running at wavelengths around 800 nm, have been the workhorse for generating CEP-stable pulses with single-cycle durations [2]. Increasing demand arises for CEP-stable, MHz-rate single-cycle sources at longer wavelengths, allowing to excite a broad range of low-bandgap materials. Laser oscillators based on Cr ²⁺ -doped II-VI gain media have evolved as alternatives to Ti:Sa technology with emission wavelengths around 2–3 μm [3], which can be efficiently post-compressed in bulk material [4].

Supercontinuum

Attosecond

10.1109/cleo/europe-eqec57999.2023.10232410

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Low-Noise Carrier-Envelope-Offset-Stabilized Yb:CaF₂ Oscillator

IEEE Photonics Technology Letters (2020)

Maciej Kowalczyk Arkadiusz Hudzikowski Michał Porębski Jarosław Sotor

We demonstrate a carrier-envelope-offset-stabilized, self-referenceable Yb:CaF ₂ oscillator pumped by a single-mode laser diode. By exploiting mode-locking regime based on simultaneous action of the SESAM and the Kerr lens effect we achieved self-starting generation of 85 fs pulses with a peak power approaching 47 kW. The carrier-envelope offset detection scheme was based on a standard f-to-2f interferometer with a spectral broadening in a highly nonlinear photonic crystal fiber. By employing a pump current feedback locking technique we achieved an in-loop integrated phase noise reaching 67 mrad in the 1 Hz - 1 MHz range. This exceptionally stable operation was enabled by a single-mode pump diode exhibiting intrinsically low-noise characteristics.

Mode-Locking

Envelope (radar)

10.1109/lpt.2020.2998286

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Citations (2)