Article
Optics
Shixiang Wang, Chenhui Lu, Zhengquan Fan, Aurelien Houard, Vladimir Tikhonchuk, Andre Mysyrowicz, Songlin Zhuang, Vasily A. Kostin, Yi Liu
Summary: The study demonstrates coherent control of nitrogen molecules ionization by femtosecond laser, with phase shifts between three laser colors affecting ionization degree. The observations suggest competition between different parametric channels influencing the ionization process.
Article
Chemistry, Analytical
Andrey Krutilin, Sascha W. Epp, Glaynel M. L. Alejo, Frederik Busse, Djordje Gitaric, Hendrik Schikora, Heinrich Schwoerer, Friedjof Tellkamp
Summary: We developed a cryogenic mass spectrometry method using femtosecond laser pulses to detect peptides in ice films at the attomole dilution range. Our study found that temperature, substrate composition, and irradiation wavelength had minimal impact on signal intensity once the preparation protocol was optimized. We observed a complex behavior of analyte desorption and ionization with thinning ice films at increased temperatures. Cryogenic conditions enabled signal detection only from isolated spots, while higher temperatures led to more frequent detection and intense signal onset. Additionally, we found that the fragmentation pattern produced by both irradiation wavelengths was similar. Our findings highlight the potential of femtosecond mass spectrometry for analyzing small organic molecules and peptides in aqueous solution without the need for matrix or substrate surface modification.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Kernius Vilkevicius, Algirdas Selskis, Evaldas Stankevicius
Summary: This study investigates the formation of gold nanostructures (nanobumps, nanocones, and nanojets) on the surface of metal using laser direct writing technique with different laser wavelengths. Experimental results show that shorter wavelength lasers provide a more precise and efficient fabrication process for controlling the properties of the nanostructures, making them highly suitable for practical applications.
APPLIED SURFACE SCIENCE
(2023)
Review
Biochemical Research Methods
Lanaia Itala Louzeiro Maciel, Ricardo Alves Bernardo, Rafael Oliveira Martins, Almir Custodio Batista Jr, Joao Victor Ataide Oliveira, Andrea Rodrigues Chaves, Boniek Gontijo Vaz
Summary: The imaging of biological tissues using mass spectrometry imaging (MSI) techniques allows for the visualization of the distribution of various metabolites, drugs, lipids, and glycans in complex samples. MSI methods like DESI-MSI and MALDI-MSI provide high sensitivity and the ability to evaluate/visualize multiple analytes in a single sample, overcoming limitations of classical microscopy techniques. This review discusses the application of DESI-MSI and MALDI-MSI in evaluating exogenous and endogenous molecules in biological samples, providing technical insights and recent research findings.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2023)
Article
Optics
Yury Geints, Olga Minina, Alexander Zemlyanov
Summary: This study theoretically considers the propagation of high-intensity femtosecond laser pulses in air under conditions of superposed spatial phase modulation. Numerical simulations and analysis are conducted to investigate the dynamics of pulse self-focusing, filamentation, and post-filamentation self-channeling. The results show that, with specific phase modulations, the filamentation region of the pulse can be extended and shifted further in air. Highly localized light channels are formed during the post-filamentation propagation of spatially structured radiation.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2022)
Article
Optics
Tadas Bartulevicius, Mykolas Lipnickas, Virginija Petrauskiene, Karolis Madeikis, Andrejus Michailovas
Summary: This study demonstrates a versatile method for burst formation using the active fiber loop (AFL) and showcases the operation of an industrial-grade ultrafast laser system in both single-pulse and GHz-burst regimes, with varying pulse energies and durations.
Article
Chemistry, Multidisciplinary
Ouyang Dan, Chuanzhe Wang, Chao Zhong, Juan Lin, Gang Xu, Guane Wang, Zian Lin
Summary: In this study, novel LDI-MS substrates were designed to enhance the sensitivity of mass signals and achieve high accuracy diagnosis of different saccharides and central precocious puberty (CPP).
Article
Optics
Eva Klimesova, Olena Kulyk, Laura Dittrich, Jakob Andreasson, Maria Krikunova
Summary: Efficient acceleration of ambient gas ions was observed in the presence of a laser-irradiated nanoparticle, with He+ ions gaining higher maximum kinetic energy compared to Cs+ and Cl+ ions. The environment was found to play an essential role in the interaction of intense light with dense matter.
Article
Chemistry, Multidisciplinary
Botong Liu, Yan Yang
Summary: We experimentally demonstrate the dissociative photoionization of CHBrCl2 molecules in a femtosecond laser field. The low kinetic energy components are from the dissociative ionization process of single-charged molecular ions. The angular distribution of fragment Cl+ ions can be attributed to the features of dissociative state and molecular configuration, while that of Br+ ions results from the electronic wave-packet evolution and combination of the multi-dissociation processes. The high kinetic energy components are from the Coulomb explosion of multi-charged molecular ions, and the error of the C-Br distance involved in the Coulomb explosion can be explained by the movement of the effective charge center of the polyatomic molecule.
APPLIED SCIENCES-BASEL
(2022)
Article
Optics
V Tamuliene, D. Buazius, V. Vaicaitis
Summary: The study investigates terahertz and third-harmonic generation by tightly focused bichromatic femtosecond pump pulses with comparable input intensities in air, both experimentally and theoretically. Plasma-assisted temporal shifts in the field of intense laser pulses lead to a time delay between the pump pulses near the focus, which can be compensated for by the initial time delay. The possibility of characterizing the plasma channel length from correlation functions is discussed.
Article
Physics, Fluids & Plasmas
Yajun Guo, Jianji Wang, Xiaowei Song, Jingquan Lin
Summary: This study proposes enhancing the supercontinuum intensity by setting a gaseous lattice in the path of femtosecond laser filamentation, which can increase the spectral intensity by up to about ten times. The introduction of a gaseous lattice significantly impacts the time-domain evolutions of optical intensity and electron density during pulse propagation, leading to spectral intensity enhancement.
PHYSICS OF PLASMAS
(2021)
Article
Physics, Fluids & Plasmas
Shuang Lin, Yun Zhang, He Zhang, Yunfeng Zhang, Mingying Chang, Xiaoting Wang, Anmin Chen, Yuanfei Jiang, Suyu Li, Mingxing Jin
Summary: This study experimentally investigates the characteristics of femtosecond laser-induced nitrogen fluorescence emission at different air pressures and observes the opposite variation of fluorescence signals from nitrogen molecule and molecular nitrogen ion as a function of air pressure. It is deduced that dissociative recombination is the main pathway for the production of the C-3 Pi(u) state of N-2. This research helps to elucidate the physical emission mechanism of femtosecond laser-induced nitrogen fluorescence emission.
PHYSICS OF PLASMAS
(2021)
Article
Multidisciplinary Sciences
Chadaporn Chaiden, Janthima Jaresitthikunchai, Anusak Kerdsin, Nattakan Meekhanon, Sittiruk Roytrakul, Suphachai Nuanualsuwan
Summary: In this study, MALDI-TOF-MS analysis of extracted peptides was developed to improve the classification of S. suis serotypes. The method successfully differentiated highly pathogenic SS2 and SS14 from other serotypes, indicating its potential as an alternative approach for serotyping clinically pathogenic S. suis isolates.
Article
Physics, Multidisciplinary
Alexander Golombek, Lars Breuer, Lisa Danzig, Paul Kucharczyk, Marika Schleberger, Klaus Sokolowski-Tinten, Andreas Wucher
Summary: Ion beams in the keV regime are commonly used in solid-state physics, but the ultrafast dynamics triggered by ion impacts on surfaces are currently only accessible through simulations. Experimental access to this process may be achieved through a laser-synchronized ion source, as demonstrated in this study. The study showcases a new miniaturized ion optical setup for generating rare gas ion pulses using femtosecond laser photoionization, with results showing good agreement with ion trajectory simulations.
NEW JOURNAL OF PHYSICS
(2021)
Article
Optics
Runmin Liu, Defeng Zou, Shuang Niu, Youjian Song, Minglie Hu
Summary: In this study, we use the real-time spectral measurement technique of time-stretch Fourier transform to reveal the influence of collisions on the dynamical transitions of dual-color soliton molecules in dual-wavelength mode-locked fiber lasers. We find that reversible transitions between stationary soliton molecules and vibrating soliton molecules can occur during collisions without external intervention. Numerical results confirm the universality of collision-induced bifurcation behavior. These findings provide new insights into collision dynamics in dual-wavelength ultrafast fiber lasers.
