Article
Engineering, Electrical & Electronic
Dan Cheng, Yujun Feng, Meng Ding, Debasis Pal, Johan Nilsson
Summary: We demonstrate that random phase modulation using an intra-cavity electro-optic phase modulator does not inhibit the generation of ultrashort pulses in an erbium-doped fiber ring-laser. The laser is stable and self-starting, even when the phase modulator is driven with sufficiently fast and strong random sequences that render the laser cavity modeless. The lack of phase-sensitive elements in the cavity explains the insensitivity to random phase modulation.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
D. N. Makarov, K. A. Makarova, A. A. Kharlamova
Summary: This article introduces the interaction characteristics between ultrashort laser pulses and complex molecular structures, and proposes a scattering theory applicable to such substances. Examples of the scattering spectra of DNA and RNA are presented. The developed theory is more general in the scattering theory and can transition into the previously known one when the duration of the ultrashort laser pulses is considered sufficiently long.
SCIENTIFIC REPORTS
(2022)
Article
Optics
X. Hu, J. Guo, L. M. Zhao, J. Ma, D. Y. Tang
Summary: This study reports the first experimental observation of the coexistence of scalar dark and bright solitons in a fiber laser. The properties of the dark and bright solitons, as well as their bound states, were investigated and confirmed through numerical simulations based on the coupled Ginzburg-Landau equations.
Review
Optics
Ivan Sytcevich, Chen Guo, Sara Mikaelsson, Jan Vogelsang, Anne-Lise Viotti, Benjamin Alonso, Rosa Romero, Paulo T. Guerreiro, Inigo J. Sola, Anne L'Huillier, Helder Crespo, Miguel Miranda, Cord L. Arnold
Summary: The dispersion scan (d-scan) technique is a simple-to-implement method for characterizing ultra-short laser pulses, with intuitive and easy-to-interpret traces and fast, robust retrieval algorithms. This review focuses on the second harmonic generation d-scan technique and compares recent implementations, demonstrating the versatility of the technique.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Engineering, Manufacturing
Julian Zettl, Maximilian Klar, Stefan Rung, Cemal Esen, Ralf Hellmann
Summary: This study presents a comprehensive micromachining investigation of rotationally symmetric parts using femtosecond laser, exploring the influences of different parameters on ablation rate and surface roughness. The research achieved the smallest feasible feature sizes and smoothest surfaces, but encountered limitations due to laser induced periodic surface structures and discussed the variation of fluence on curved surfaces, as well as examined heat input into the material.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Chemistry, Physical
M. Zukerstein, J. Hrabovsky, J. Sladek, I Mirza, Y. Levy, N. M. Bulgakova
Summary: Tubular structures and microneedles can be formed on monocrystalline silicon surface using ultrashort laser pulses. The height and morphology of the structures can be controlled by single and multi-pulsed irradiation, and the mechanisms responsible for their formation are discussed. The generated silicon microtubes and needles have applications in various fields.
APPLIED SURFACE SCIENCE
(2022)
Article
Optics
Alena Nastulyavichus, Sergey Kudryashov, Andrey Ionin, Yulia Yushina, Anastasia Semenova, Sergey Gonchukov
Summary: This study compares the propagation and ablation effects of ultrashort and ultralong laser pulses in water and on gold targets. The filamentary laser propagation is visualized through pre-focal plasma channels formed in water. The position-dependent ablative optical density yield of colloidal solutions and target mass loss are characterized, providing a new approach for enhancing colloidal generation in antibacterial, biomedical, and nanophotonics applications.
LASER PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Sergey A. Lizunov, Alexander Bulgakov, Eleanor E. B. Campbell, Nadezhda M. Bulgakova
Summary: In this study, the melting of gold by femto- and picosecond near-infrared laser pulses was systematically investigated experimentally and theoretically. The results showed that only one combination of modeling parameters was able to accurately describe the damage thresholds of gold under different laser conditions.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Engineering, Electrical & Electronic
Tomoyoshi Inoue, Koki Nagao, Atsushi Matsunaka, Takuma Kokubu, Kenzo Nishio, Toshihiro Kubota, Yasuhiro Awatsuji
Summary: In this letter, we propose an ultrafast optical imaging technique for obtaining dual motion pictures of propagating light pulses with an ultrashort time difference. By using a polarization imaging camera and an optical delay setup, we successfully captured two propagating light pulses with ultrashort time differences.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Optics
Li Ma, Chao Chen, Zijun Zhan, Qingrui Dong, Chuanfu Cheng, Chunxiang Liu
Summary: Proposed a rotationally interleaved multispiral for generating high-quality ultrashort vortices. The feasibility of multispirals in generating ultrashort vortices with symmetric distributions and flexible control of topological charges was demonstrated through theoretical analysis, numerical simulation, and experimental investigation.
Article
Optics
Yulia Gulina, Jiaqi Zhu, Alexey Gorevoy, Mikhail Kosobokov, Anton Turygin, Boris Lisjikh, Andrey Akhmatkhanov, Vladimir Shur, Sergey Kudryashov
Summary: Double-track microstructures were induced in a z-cut lithium niobate crystal using 1030nm 240fs ultrashort laser pulses. The topography of the microstructures was characterized using atomic force microscopy in piezoelectric response mode. The spatial positions of laser-induced modification regions inside the crystal could be predicted using simple analytical expressions.
Article
Optics
N. N. H. E. N. Mahmud, N. A. Awang, N. U. H. H. Zulkefli, F. N. M. Hanafiah
Summary: This study presents a method for optically trapping silica gel microparticles using a stable Q-switched fiber laser pulse. By fabricating gold nanoparticles as saturable absorbers, stable Q-switched fiber laser pulses with a frequency of 25.81 kHz were achieved. The microparticles exhibited different attractive trapping forces based on the viscous drag exerted by the laser field. Experimental results confirmed the validity of the numerical model and demonstrated the potential application of the proposed system for absorption microparticle trapping at 1540 nm wavelength.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Chemistry, Physical
Daniel Wyn Mueller, Sarah Losslein, Christoph Pauly, Max Briesenick, Guido Kickelbick, Frank Muecklich
Summary: Surface functionalization through biomimetic patterns at the micro-and nanometer scale has been widely employed in various applications. The surface properties, which depend on the morphology of the applied topographies, need to be carefully adjusted for optimal functionalization efficiency. This study investigates the role of surface modification and its impact on pattern formation in the multi-pulse ultrashort pulsed direct laser interference patterning (USP-DLIP) of Cu using a comprehensive characterization approach. The findings reveal the influence of USP-DLIP processing on both the chemistry and mechanical deformation of the substrate surface, affecting laser/material interaction and pattern morphology. Understanding these interactions allows for precise design of micro-and nanoscale patterns during USP-DLIP processing.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Tobias Ullsperger, Yannick L. Wencke, Burak Yuerekli, Gabor Matthaeus, Markus Rettenmayr, Gerrit A. Luinstra, Stefan Nolte
Summary: Laser-based additive manufacturing of UHMWPE using ultrashort laser pulses at a wavelength of 1030 nm expands the processing window and improves physical properties. Multi-photon absorption processes increase absorption locally, allowing for control over pulse energy and repetition rate to achieve polymer particle fusion. Preliminary tensile tests on produced specimens show an ultimate tensile strength of 4 MPa, surpassing values obtained using a CO2 laser.
MATERIALS & DESIGN
(2021)
Article
Optics
George K. K. Krasin, Yulia S. S. Gulina, Evgeny V. V. Kuzmin, Victor P. P. Martovitskii, Sergey I. I. Kudryashov
Summary: The filamentation of focused 300 fs laser pulses with variable polarization azimuth in synthetic HPHT diamond demonstrates the potential for polarization-dependent control of bandgap for crystal dielectric photoexcitation. This affects the filamentation threshold power, which depends on the polarization azimuth angle. The nonlinear photoluminescence yield when focusing ultrashort laser pulses with variable polarization in the synthetic diamond indicates different polarization-dependent regimes in the formation of electron-hole plasma, due to different photoexcitation and recombination processes during the filamentation process. At low intensities, the photoluminescence yield rate depends on the polarization azimuth controlling bandgap, while at high intensities, the resulting dense plasma exhibits isotropy with respect to laser polarization, and photoluminescence yield weakly depends on polarization azimuth.
