Ultrafast Nonlinear Optics Group
The Ultrafast Nonlinear Optics Group specializes in fundamental and applied research on ultrafast nonlinear laser-matter interactions in transparent bulk materials and photonic crystal fibers. Their work aims to develop compact, high-average power, ultrashort pulse light sources. Key areas of focus include supercontinuum generation, optical parametric amplification, fiber-based laser amplification, frequency conversion, and pulse post-compression.
- Nonlinear propagation and supercontinuum generation in bulk materials, photonic crystal fibers and photonic crystals;
- Light-driven structural modifications of transparent materials and related nonlinear optical phenomena;
- Generation of few optical cycle pulses via spectral broadening, optical parametric amplification and pulse post-compression;
- Development of high repetition rate tunable wavelength UV-VIS femtosecond laser systems;
- Development of sub-nanosecond optical parametric generators and amplifiers.
Article
Description
Group members
Publications
Most significant publications
Most significant publications:
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A. Dubietis, A. Matijošius, Table-top optical parametric chirped pulse amplifiers: past and present (REVIEW), Opto-Electronic Advances 6, 220046 (2023).
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A. Dubietis and A. Couairon, Ultrafast supercontinuum generation in transparent solid state media, Springer Nature, Cham, Switzerland, ISBN 978-3-030-14994-9, 125 p., 2019.
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J. Banys, J. Jakutis Neto, A. Žukauskas, V. Pašiškevičius, V. Jarutis, J. Vengelis, Backward wave optical parametric oscillator pumped by subnanosecond microlaser pulses, APL Photonics 10(3), 036123 (2025).
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J. Pimpė, J. Banys, S. Armalytė, J. Jakutis Neto, V. Jarutis, A. Dubietis, J. Vengelis, Highly stable, 72 W average power, 76 MHz repetition rate femtosecond hybrid PCMA-FCPA Yb-fiber amplifier, Optics & Laser Technology 190, 113261 (2025).
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J. Pimpė, S. Armalytė, A. Dubietis, J. Vengelis, 11 W, broadly tunable, bulk supercontinuum-seeded femtosecond optical parametric amplifier at 76 MHz, Optics & Laser Technology 196, 114633 (2026).
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R. Grigutis, G. Tamošauskas, V. Jukna, A. Risos, A. Dubietis, Supercontinuum generation and optical damage of sapphire and YAG at high repetition rates, Optics Letters 45, 4507 (2020).
Most recent publications
Most recent publications:
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J. Pimpė, S. Armalytė, A. Dubietis, J. Vengelis, 11 W, broadly tunable, bulk supercontinuum-seeded femtosecond optical parametric amplifier at 76 MHz, Optics & Laser Technology 196, 114633 (2026).
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J. Banys, V. Jarutis, J. Vengelis, Nonlinear absorption and parametric gain interaction in green-pumped subnanosecond MgO:PPLN OPG, Optics Express 33(15), 570650 (2025).
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T. Latvys, J. Banys, V. Jarutis, J. Vengelis, V. Tamulienė, X-wave formation in the subnanosecond backward-wave optical parametric oscillator, Physical Review A 111, 063517 (2025).
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J. Pimpė, J. Banys, S. Armalytė, J. Jakutis Neto, V. Jarutis, A. Dubietis, J. Vengelis, Highly stable, 72 W average power, 76 MHz repetition rate femtosecond hybrid PCMA-FCPA Yb-fiber amplifier, Optics & Laser Technology 190, 113261 (2025).
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J. Banys, J. Jakutis Neto, A. Žukauskas, V. Pašiškevičius, V. Jarutis, J. Vengelis, Backward wave optical parametric oscillator pumped by subnanosecond microlaser pulses, APL Photonics 10(3), 036123 (2025).
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V. Marčiulionytė, G. Tamošauskas, M. Šutovas, A. Dubietis, Supercontinuum generation in scintillator crystals, Scientific Reports 15, 748 (2025).
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V. Jarutis, A. Stravinskaitė, M. Kuliešaitė, J. Vengelis, Semi-analytical non-iterative cross-correlation frequency-resolved optical gating retrieving algorithm, Optics Communications 574, 131058 (2025).
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M. Kuliešaitė, J. Vengelis, V. Jarutis, Measurement polarization-maintaining photonic crystal fiber nonlinear response using phase shift between orthogonal polarization modes, Optics Express 32(26), 543408 (2024).
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V. Marčiulionytė, J. Banys, J. Vengelis, G. Tamošauskas, A. Dubietis, All-Solid-State Post-Compression of Low-Energy Pulses at High Repetition Rate, Photonics 11, 386 (2024).
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B. Momgaudis, V. Marčiulionytė, V. Jukna, G. Tamošauskas, M. Barkauskas, A. Dubietis, Supercontinuum generation in bulk solid‑state material with bursts of femtosecond laser pulses, Scientific Reports 14, 7055 (2024).
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J. Banys, S. Armalytė, J. Pimpė, O. Balachninaitė, V. Jarutis, J. Vengelis, Subnanosecond microlaser pumped fan-out grating design MgO:PPLN optical parametric generator continuously tunable from near- to mid-infrared, Optics & Laser Technology 171, 110433 (2024).
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J. Banys, S. Armalytė, J. Pimpė, O. Balachninaitė, V. Jarutis, J. Vengelis, Enhancing conversion efficiency of MgO:PPLN and Rb:PPKTP crystal-based subnanosecond optical parametric generators by utilizing a supercontinuum seed, Infrared Physics & Technology 137, 105158 (2024).
International collaboration
Laser equipment
Laboratory of Ultrashort Pulse Optics (301)
- Ti:sapphire laser system (Spitfire-PRO, Newport-Spectra Physics): pulsewidth 100 fs, energy 3 mJ, wavelength 800 nm, pulse repetition rate 1 kHz.
- Optical parametric amplifier (Topas-Prime, Light Conversion Ltd.): pulsewidth 100 fs, wavelength tuning range 1150-2600 nm, home made DFG stage, tuning range 3-5 μm.
- Noncollinear optical parametric amplifier (Topas-white, Light Conversion Ltd.): pulsewidth 25 fs, wavelength tuning range 530-720 nm.
- Yb:KGW laser system (Pharos, Light Conversion Ltd): pulsewidth 190 fs, energy up to 1 mJ, wavelength 1030 nm, pulse repetition rate up to 200 kHz.
- Optical parametric amplifier (Orpheus-One, Light Conversion Ltd.): pulsewidth 200 fs, wavelength tuning range 1320-4500 nm, DFG stage, tuning range 5-12 μm, pulse repetition rate up to 14 kHz.
Laboratory of Quantum Optics (403)
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Yb:KGW oscillator (FLINT, Light Conversion Ltd.): pulsewidth 100 fs, wavelength 1028 nm, average power 6.5 W, pulse repetition rate 76 MHz; SHG module (HIRO, Light conversion Ltd.): pulsewidth 120 fs, wavelength 514 nm, average power 2.5 W
Laboratory of Parametric Phenomena (110)
- Yb:KGW oscillator (FLINT, Light Conversion Ltd.) with integrated in rod-type fiber PCMA system: pulse width 114 fs, wavelength 1030 nm, average power 72 W, pulse repetition rate 76 MHz.
- Nd:YAG microlaser (MOPA, Standa Ltd.): pulsewidth 400 ps, wavelength 1064 nm, pulse repetition rate 1 kHz with second (532 nm) and third (355 nm) harmonics generation modules.
- Nd:YAG microlaser (MOPA, Standa Ltd.): pulsewidth 520 ps, wavelength 1064 nm, pulse repetition rate 1 kHz, average power 1 W.
- Optical spectrum analyzer (Thorlabs): detection range 1-12 μm, performance mode CW and >30 kHz in pulsed regime.
- Pulse picker (MP1, Eksma Optics): range 130 ns – 1 ms, 76 MHz synchronization.
Ongoing Projects
Towards very high average power and high repetition rate tunable femtosecond laser systems
Number: FA8655-25-1-7020
Head: Dr. J. Vengelis
Duration: 36 months
Funding: 157 500 USD
Funding agency: US Air Force European office of aerospace research and development
Project description:
The aim of this project is to develop a very high average power and high repetition rate (76 MHz) femtosecond amplification system based on a novel high power rod-type fiber amplifier with subsequent optical parametric amplification stages that would enable generation of high average power femtosecond pulses tunable in the visible, near- and mid-infrared spectral range.
Advanced high repetition rate, high average power optical parametric amplifiers in the midinfrared spectral range (POWEROPA)
Number: S-MIP-25-13
Principal investigator: Prof. A. Dubietis
Partner:Royal Institute of Technology (KTH), Sweden
Duration: 35 months
Funding: 199 378 EUR
Funding agency: The Research Council of Lithuania
Project description:
This project endeavours pushing the boundaries of 76 MHz OPA technology by implementation of conceptually novel approaches, namely, bulk-generated supercontinuum seeding, optical parametric amplification in bulk nonlinear crystals instead of periodically poled materials, and backward wave optical parametric oscillation in picosecond and femtosecond regimes.
Development of high repetition rate tunable wavelength UV-VIS femtosecond laser system. (HIREPUVIS)
Number: S-MIP-23-23
Principal Investigator: Dr. J. Vengelis
Duration: 36 months
Funding: 150 000 EUR
Funding agency: The Research Council of Lithuania
Project description:
The aim of this project is to develop watt-level average power high repetition rate broadly tunable wavelength UV-VIS femtosecond laser system. This will be accomplished by developing a combined laser setup consisting of laser amplifier, harmonic generator and synchronously pumped optical parametric oscillator. Such combined laser system will superceed capabilities of any currently existing laser or optical parametric generator system used for spectroscopy, nonlinear microscopy, material science and laser micromachining applications in terms of measurement / micromachining speed, versatility, accuracy and efficiency.