Article
Materials Science, Multidisciplinary
Ni Chen, Runkai Wang, Balasubramanian Nagarajan, Bo Yan, Yang Wu, Ning He, Sylvie Castagne
Summary: The study proposes a strategy of metal-coating-assisted laser ablation to improve the machining quality of diamond, and establishes a model to evaluate surface roughness and ablation depth. Laser ablation with coatings significantly reduces surface roughness of diamond while having minimal impact on ablation depth.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
Bakhtiar Ali, Han Xu, Dashavir Chetty, Robert T. Sang, Igor Litvinyuk, Maksym Rybachuk
Summary: The degree of laser-induced graphitization in single crystal chemical vapor deposited diamond was studied. The sp(3) phase transitions to sp(2) aromatic crystalline graphitic fraction below a critical fluence, above which amorphous carbon is formed. The increase in fluence leads to a significant increase in the depth of graphitized areas and cleavage of C=O bonds.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Lujun Ren, Yuping Ma, Haisong Cao, Xingxing Zhang, Yuan Han, Chao Wei
Summary: The removal rate of nano-crystalline diamond-coated materials using femtosecond laser etching was studied by adjusting the laser repetition rate, energy-flux density, and scanning speed. The results showed that the removal rate was not significantly affected by the repetition frequency and that the accumulated laser energy on the surface remained steady. The material removal rate varied with different scanning speeds, initially increasing and then decreasing. Higher energy-flux density resulted in higher etching intensity and material removal rate.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Multidisciplinary
Han-Hui Wang, Jing-An Kong, Min Xu, Peng-Fei Zhang, Li Yang, Xiao-Hong Shi, He-Jun Li
Summary: The SiO2-Nd2O3/Si-SiC-MoSi2 coating was proposed to repair damaged SiC coated C/C composites by laser cladding. Results showed that the coating effectively improved the laser ablation resistance of the specimens by reducing the maximum temperature and promoting the growth of ablative products.
Article
Chemistry, Physical
Jingxiang Gao, Yongzhi Cao, Kaijie Wang, Peng Zhang, Feng Guo, Yongda Yan, Zhenjiang Hu
Summary: This study focuses on the preparation and characterization of high-energy stray-light-absorbing films for aluminum alloy frames in laser systems. The damage mechanism of the films and a dynamic thermal-mechanical direct coupling model for laser irradiation process were also investigated. The results showed that these stray-light-absorbing films significantly increased the stray-light absorptivity and effectively reduced laser irradiation damage, improving the accuracy and stability of the system.
SURFACES AND INTERFACES
(2022)
Article
Optics
Zhen Zhang, Quanli Zhang, Qiwen Wang, Yucan Fu, Jiuhua Xu
Summary: This study investigates the surface microstructuring of single crystalline diamond using a nanosecond pulsed laser, analyzing the nanometric surface characteristics of ablated micro-grooves caused by the thermal effect and the dependence of surface characteristics on laser ablation parameters. By programming the scanning path of the laser beam based on mathematical analysis, five different types of surface microstructures are fabricated on the diamond to achieve high surface quality.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Polymer Science
Karol Bula, Bartosz Korzeniewski
Summary: This research aimed to enhance the adhesion between polyamide 6 (filled with glass fiber) and aluminum using low-power laser treatment. Micro-patterns were prepared on aluminum sheets using a fiber laser beam, and metallic inserts were overmolded in various configurations. The results showed that a significant recast melt was formed at the lowest laser speed, leading to the highest roughness parameter value.
Article
Materials Science, Ceramics
Aida Naghilou, Oscar Bomati-Miguel, Ana Subotic, Ruth Lahoz, Markus Kitzler-Zeiler, Christine Radtke, Miguel A. Rodriguez, Wolfgang Kautek
Summary: This study focused on the generation of bimetallic oxide nanoparticles using a reaction-sintering method and laser ablation in liquids. The results showed successful production of nanoparticles without a core-shell morphology, influenced by the properties of metallic oxide ceramics and the liquid used. The research lays the groundwork for the creation of well-defined bimetallic nanoparticles with potential X-ray and magnetic absorption properties for multimodal imaging applications.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Han-Hui Wang, Jing-An Kong, Jian Ge, Liu Teng, Xiao-Hong Shi, He-Jun Li
Summary: By repairing damaged SiC-coated C/C composites with a double-layer coating, the laser reflection in the repaired area was enhanced to effectively mitigate thermal damage and oxidation. This improvement significantly reduced surface and back temperatures, avoiding ablation reactions and protecting the C/C substrates.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Andrey A. A. Khomich, Vitali Kononenko, Oleg Kudryavtsev, Evgeny Zavedeev, Alexander V. V. Khomich
Summary: The use of ultrafast pulses in laser processing, including on diamonds, is currently popular. The orientation of the irradiated crystal face has recently been found to be important for the diamond to graphite transition process. In this study, a Ti:sapphire laser was used to produce highly oriented graphite layers on the (111) surface of a diamond monocrystal, and the structure of the graphitized material was analyzed using confocal Raman spectroscopy. The results show a correlation between laser ablation regimes and sp(2) phase structure, and provide insight into the optimal laser fluence for producing perfect graphite spots on the diamond surface.
Article
Optics
Natalia Sapogova, Vladimir Bredikhin, Andrey Afanasiev, Vladislav Kamensky, Nikita Bityurin
Summary: Light-heat converters made of optical fibers with a strong absorbing layer at the tip can achieve stable temperatures at different laser powers. Research revealed that laser ablation of the tip coating is the main reason for this phenomenon.
Article
Materials Science, Multidisciplinary
Natalie C. Golota, David Preiss, Zachary P. Fredin, Prashant Patil, Daniel P. Banks, Salima Bahri, Robert G. Griffin, Neil Gershenfeld
Summary: Laser processing of diamond is crucial for next generation microelectronic and quantum devices, but achieving low taper, high aspect ratio structures remains challenging. We studied the impact of pulse energy, pulse number, and irradiation profile on aspect ratio in diamond using 532 nm nanosecond laser machining. We achieved a maximum aspect ratio of 22:1 with 10,000 pulses during percussion hole drilling of diamond. Rotary assisted drilling with over 2 million pulse accumulations allowed us to reach average aspect ratios of 40:1 and up to 66:1. Additionally, we demonstrated the ability to obtain 0.1 degrees taper angles in 10:1 aspect ratio tubes using ramped pulse energy machining. We also investigated the effects of laser induced damage and found a 36% increase in tensile strain following strong laser irradiation. However, applying 600 degrees C heat treatment reduced the induced strain by up to 50% with significant homogenization of strain observed.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Multidisciplinary Sciences
Alexander Savvin, Alexander Dormidonov, Evgeniya Smetanina, Vladimir Mitrokhin, Evgeniy Lipatov, Dmitriy Genin, Sergey Potanin, Alexander Yelisseyev, Viktor Vins
Summary: The authors successfully demonstrated lasing in (NV-) centers in diamond, achieving improved laser efficiency by fine-tuning the pump conditions to reduce photoionization. Investigation into lasing conditions and gain saturation was conducted under high-power laser pulse pumping of diamond crystal.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Ceramics
Zhenhai Guo, Fuming Deng, Lei Zhang, Cen Hao, Xin Zhao, Daohui Xiang
Summary: The experimental results show that under dry friction conditions, the texture structure has a significant impact on the friction coefficient and wear resistance of diamond coatings. For the same type of textures, the larger the texture surface area, the lower the friction coefficient. Elliptical textures can capture abrasive particles and reduce the friction coefficient of diamond coatings.
CERAMICS INTERNATIONAL
(2021)
Article
Polymer Science
Alexey Rybaltovskii, Nikita Minaev, Svetlana Tsypina, Svetlana Minaeva, Vladimir Yusupov
Summary: New results are presented on the laser formation of microstructures in polymer films using continuous-wave laser radiation, focusing on the formation of foam-like track structures and the involvement of photoinduced mechanisms. Raman spectroscopy was used to analyze the formation process and the effects of luminescent microstructures on glass surfaces during laser drawing were studied.
Article
Engineering, Electrical & Electronic
V. D. Frolov, P. A. Pivovarov, Evgeny V. Zavedeev, M. L. Shupegin, S. M. Pimenov
QUANTUM ELECTRONICS
(2020)
Article
Optics
V. M. Gololobov, V. V. Kononenko, T. Kononenko, V. Konov
Summary: A femtosecond optical technique has been developed to study highly absorbing microplasma in transparent media under intense laser radiation. The approach combines interferometric and shadow microscopy to reconstruct induced changes in the optical properties of the medium.
LASER PHYSICS LETTERS
(2021)
Article
Optics
Maxim Komlenok, Taras Kononenko, Dmitry Sovyk, Vladimir Pavelyev, Boris Knyazev, Evgeny Ashkinazi, Anton Reshetnikov, Gennadii Komandin, Vladimir Pashinin, Victor Ralchenko, Vitaly Konov
Summary: A new method for fabricating diamond diffractive lenses for the THz range using laser-assisted replication technique was proposed in this study. Testing showed a high diffraction efficiency of 95% +/- 5% and good agreement between the measured and expected intensity distribution in the focal plane when tested with a free-electron laser at a wavelength of 141 μm.
Article
Engineering, Electrical & Electronic
V. V. Kononenko, V. M. Gololobov, T. Kononenko, E. A. Goncharov, V. Konov
Summary: Investigations into the changes in optical properties of water and hexane under femtosecond irradiation reveal inconsistencies between the estimated excited-carrier concentration and the amount of energy transferred to the liquid, particularly pronounced in hexane. This raises new questions about mechanisms of energy transfer in liquids subjected to intense laser irradiation.
QUANTUM ELECTRONICS
(2021)
Article
Optics
Maxim S. Komlenok, Taras Kononenko, Vitaly Konov, Yulia Yu Choporova, Natalya D. Osintseva, Boris A. Knyazev, Vladimir S. Pavelyev, Konstantin N. Tukmakov, Victor A. Soifer
Summary: A high-frequency laser ablation technique using a 2D beam scanner was designed and applied to create a silicon diffractive optical element (DOE) for focusing a terahertz Gaussian beam into a square region. The microrelief of the resulting silicon DOE was analyzed using a white-light interferometer and a scanning electron microscope. The diffraction efficiency of the DOE, measured at 97 +/- 2%, was demonstrated using a pyroelectric camera after being illuminated by a high-power beam from a free-electron laser.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Ivan Kondrashov, Maxim Komlenok, Pavel Pivovarov, Sergey Savin, Elena Obraztsova, Maxim Rybin
Summary: This paper investigates six methods to reduce the roughness of copper foils in order to decrease the formation of additional graphene layers, successfully achieving a decrease in the content of the additional layer under optimized conditions. The quality and number of layers of synthesized graphene are analyzed through various methods in this study.
Article
Chemistry, Physical
Vitali V. Kononenko, Kuralay K. Ashikkalieva, Natalia R. Arutyunyan, Alexey M. Romshin, Taras Kononenko, Vitaly Konov
Summary: We conducted an experimental study on laser-induced plasma in a gold aqueous solution and explored the correlation between plasma properties and the rate of gold nanoparticles synthesis. The concentration of photo-excited carriers was measured using pump-probe and scattering microscopy techniques. The experimental data helped us identify the ionization mechanisms in liquid water and link them to the synthesis of nanoparticles.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2022)
Article
Optics
Taras Kononenko, Dmitry N. Sovyk, Vitaly V. Kononenko, Vitaly Konov
Summary: This study focuses on the influences of laser fluence, spot size, and spot overlapping on the surface roughening and ablation productivity of silicon during laser milling. An optimized process for silicon milling is proposed, which involves reducing the laser fluence by enlarging the laser spot and maintaining a low ratio of spot displacement to spot radius. Numerical simulations are conducted to determine the dominant factor in surface roughening under different processing conditions.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Maxim Komlenok, Nikolay Kurochitsky, Pavel Pivovarov, Maxim Rybin, Elena Obraztsova
Summary: A new method for fabricating graphene field emitters on various substrates at room temperature and in ambient environment is presented. The desired shape and orientation of graphene flakes along the field are achieved through blister-based laser-induced forward transfer of high-quality single-layer graphene synthesized by chemical vapor deposition. This technique allows the formation of emitting crumpled graphene patterns without compromising the quality of initially synthesized graphene.
Article
Materials Science, Multidisciplinary
K. K. Ashikkalieva, T. V. Kononenko, E. E. Ashkinazi, E. A. Obraztsova, A. A. Mikhutkin, A. A. Timofeev, V. I. Konov
Summary: This paper examines the nanostructured interior and conductive characteristics of graphitized wires formed inside diamond crystals using laser microstructuring. The study finds that rotating the laser beam inside the crystal changes the arrangement of the nanoplates, but has little influence on the macroscopic conductivity of the wires. However, increasing the laser pulse width increases both the wire conductivity and the thickness of the nanoplates.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Optics
Vitali V. V. Kononenko, Evgeny V. V. Zavedeev, Taras V. V. Kononenko, Vladimir V. V. Bukin, Vitaly I. I. Konov
Summary: This paragraph discusses the propagation of a graphitization wave through a diamond crystal under multipulse laser irradiation, which is largely a self-guided process. The authors develop new approaches to control laser graphitization for 3D laser microstructuring inside a diamond crystal. Two techniques are investigated: laser seed damage followed by exposure at lower laser fluence to restrict the graphitization wave propagation, and formation of a dominant microfracture perpendicular to the laser beam to guide the growth of graphitized threads.
Article
Optics
Taras Viktorovich Kononenko, Kuralai Khamitzhanovna Ashikkalieva, Vitali Viktorovich Kononenko, Evgeny Viktorovich Zavedeev, Margarita Alexandrovna Dezhkina, Maxim Sergeevich Komlenok, Evgeny Evseevich Ashkinazi, Vladimir Valentinovich Bukin, Vitaly Ivanovich Konov
Summary: Recently, it was discovered that a nitrogen-doped diamond-based photoconductive antenna (PCA) can be effectively excited by the second harmonic of a Ti:sapphire laser. The THz emission performance of the PCA can be significantly improved by creating a stronger electric field between closely located electrodes. To achieve a uniform electric field, deep-buried graphite electrodes were fabricated inside the diamond crystal. Different PCAs with various electrode interspaces were tested and compared.
Article
Physics, Multidisciplinary
T. V. Kononenko, K. K. Ashikkalieva, V. V. Kononenko, A. P. Bol'shakov, V. G. Ral'chenko, V. I. Konov
Summary: A technique of two-stage three-dimensional mapping is proposed to study the optical breakdown threshold in diamond crystals. The first stage involves irradiating the diamond with high-energy ultrashort laser pulses to initiate microbreakdowns, causing the formation of graphite microinclusions. The second stage measures the absolute value of the breakdown threshold by identifying the minimum laser pulse energy required for the formation of a graphite microinclusion. This technique revealed abnormal crystal zones in synthetic diamond single crystals, where the breakdown threshold changes by a factor of more than 10.
PHYSICS OF WAVE PHENOMENA
(2023)
Article
Chemistry, Multidisciplinary
Maxim Komlenok, Pavel Pivovarov, Alexey Popovich, Vladimir Cheverikin, Alexey Romshin, Maxim Rybin, Elena Obraztsova
Summary: In this paper, we propose a method to synthesize graphene on epitaxial single-crystal Cu film deposited and recrystallized on a basal-plane sapphire substrate. The optimized conditions result in single-crystal graphene growth over the entire area of copper grains with (111) orientation and record size. The high quality of synthesized graphene is confirmed by Raman spectroscopy, scanning electron microscopy, and sheet resistance measurements.
Article
Physics, Multidisciplinary
A. A. Samokhin, P. A. Pivovarov, E. Shashkov, I. A. Stuchebryukhov
Summary: The behavior of liquid mercury exposed to 25-ns laser pulses was investigated using acoustic and optical diagnostics. It was observed that an additional peak appears as the laser intensity increases, which may be due to the motion of the metal-nonmetal transition front. This assumption is supported by a decrease in reflected laser pulse and the behavior of pressure pulses on free and loaded irradiated surfaces.
PHYSICS OF WAVE PHENOMENA
(2021)
