Log in

Relevant bibliographies by topics / Pulsed mode / Journal articles

To see the other types of publications on this topic, follow the link: Pulsed mode.

Journal articles on the topic 'Pulsed mode'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Pulsed mode.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Flood, C. J., G. Giuliani, and H. M. van Driel. "Pulsed electro-optic modulation for efficient, active continuous-wave laser mode-locking." Canadian Journal of Physics 71, no. 1-2 (1993): 1–4. http://dx.doi.org/10.1139/p93-001.

Full text

Abstract:

We demonstrated efficient active mode-locking of a Nd:YAG laser using broad bandwidth, pulsed electro-optic modulation. A 10 GHz, LiTaO3 traveling wave phase modulator, driven by 300 ps FWHM electrical pulses with less than 1 mW of drive power, was used to generate detector-limited, mode-locked laser pulses of less than 50 ps duration at 76 MHz. Shorter modulator drive pulses are possible and near bandwidth-limited mode-locked pulses should be attainable. The use of pulsed modulation rather than conventional sinusoidal modulation permits both pulse width and pulse build-up time reductions and

APA, Harvard, Vancouver, ISO, and other styles

2

Kazachkov, E. L., O. V. Safronov, E. A. Kazachkova, E. N. Ignatieva, I. V. Safronova, and L. B. Tarasova. "Morphological substantiation of laser exposure parameters and modes for surgical treatment of intrauterine pathology." Ural Medical Journal 22, no. 2 (2023): 24–33. http://dx.doi.org/10.52420/2071-5943-2023-22-2-24-33.

Full text

Abstract:

Introduction No data on experimentally substantiated parameters and modes of diode laser radiation allowing a minimally traumatic surgical treatment of intrauterine pathology have been found in the literature.The aim of the investigation was to substantiate experimentally the optimum parameters and modes of diode laser radiation in the treatment of intrauterine pathology based on the study of morphological changes in the endometrium.Materials and methods 48 endometrial samples were exposed to 10-40 W diode laser power in a constant mode and 15 samples - in a pulsed mode with 3 different sets o

APA, Harvard, Vancouver, ISO, and other styles

3

Shemyakin, A. N., M. Yu Rachkov, N. G. Solov’ev та M. Yu Yakimov. "Radiation Power Control of the Industrial CO₂ Laser Excited by а Nonself-Sustained Glow Discharge by Changing the Frequency of Ionization Pulses". Mekhatronika, Avtomatizatsiya, Upravlenie 21, № 4 (2020): 224–31. http://dx.doi.org/10.17587/mau.21.224-231.

Full text

Abstract:

The article describes radiation power control of industrial CO2 lasers of Lantan series excited by а nonself-sustained glow discharge in the automatic mode. These lasers are closed-cycle fast gas-transport lasers excited by a nonself-sustained glow discharge with ionization by periodic-pulsed capacitively coupled auxiliary discharge. In this case, ionization and conductivity are provided by periodic-pulsed capacitively coupled discharge. The energy contribution to molecular oscillations is provided by the passage of the main discharge current through the plasma with electron density given by i

APA, Harvard, Vancouver, ISO, and other styles

4

Ge, Boyuan, Yajun Lou, Silin Guo, Yue Cai, and Xinhai Zhang. "A High-Energy, Wide-Spectrum, Spatiotemporal Mode-Locked Fiber Laser." Micromachines 15, no. 5 (2024): 644. http://dx.doi.org/10.3390/mi15050644.

Full text

Abstract:

In this article, we demonstrate a high-energy, wide-spectrum, spatiotemporal mode-locked (STML) fiber laser. Unlike traditional single-mode fiber lasers, STML fiber lasers theoretically enable mode-locking with various combinations of transverse modes. The laser can deliver two different STML pulse sequences with different pulse widths, spectra and beam profiles, due to the different compositions of transverse modes in the output pulses. Moreover, we achieve a wide-spectrum pulsed output with a single-pulse energy of up to 116 nJ, by weakening the spectral filtering and utilizing self-cleaning

APA, Harvard, Vancouver, ISO, and other styles

5

Kokovin, A. O., A. V. Kozyrev, and V. Yu Kozhevnikov. "Simulation of negative corona discharge in atmospheric air: from mode of Trichel pulses to stationary discharge." Journal of Physics: Conference Series 2064, no. 1 (2021): 012024. http://dx.doi.org/10.1088/1742-6596/2064/1/012024.

Full text

Abstract:

Abstract The paper presents a 2D multi-fluid non-stationary model of a negative corona discharge in atmospheric-pressure air in the needle-to-plane diode. Discharges were simulated in gaps up to 1 cm with an applied voltage in the range of 8-100 kV. The simulation results demonstrate two stages of the discharge evolution: a pulsed-periodic stage called the Trichel pulses mode and a stationary glow discharge mode. The spatio-temporal distributions of the discharge plasma and electric field are shown in detail. Physical mechanism of Trichel pulses formation and transition to the stationary disch

APA, Harvard, Vancouver, ISO, and other styles

6

Morozovych, V. V., and Yu O. Lyashenko. "Morphological structure of galvanized copper layers in inhomogeneous regimes." Cherkasy University Bulletin: Physical and Mathematical Sciences, no. 1 (2022): 64–73. http://dx.doi.org/10.31651/2076-5851-2021-64-73.

Full text

Abstract:

The microstructure of copper layers obtained by electrodeposition in stationary, pulsed and stochastic modes on copper substrates was studied by means of scanning electron microscopy. It was found that the shape of the applied grains differs significantly in the case of pulsed and stationary application modes. The technology of production of electrodeposited layers in stationary, pulse and stochastic modes of copper on copper substrates is worked out in the work. The developed automated software and hardware complex was used to control the electrodeposition process. The effect of electrodeposi

APA, Harvard, Vancouver, ISO, and other styles

7

Ustimchik, V., E. Motorin, and V. Filippov. "High peak/average power picosecond pulsed MOPA system with tapered large mode area double-clad Yb-doped fiber." EPJ Web of Conferences 266 (2022): 11014. http://dx.doi.org/10.1051/epjconf/202226611014.

Full text

Abstract:

In this paper, a high peak/average power picosecond pulsed master‑oscillator power‑amplifier (MOPA) system utilizing tapered large mode area double-clad fiber (T-DCF) is presented. In a high average power regime, we report a pulsed MOPA laser system with average power up to 613 W at 20 MHz repetition rate with 50 ps pulse duration (613 kW of peak power and 30.6 μJ pulse energy). In high peak power regime, over 3MW of peak power pulses (at seed source bandwidth) at 1 MHz repetition rate (310 μJ pulse energy and 310 W average) was demonstrated. The outstanding properties of T-DCF for amplificati

APA, Harvard, Vancouver, ISO, and other styles

8

Kandratsyeu, Aleh, Uladzimir Sabaleuski, Luis Redondo, and Andrei G. Pakhomov. "Four Channel 6.5 kV, 65 A, 100 ns–100 µs Generator with Advanced Control of Pulse and Burst Protocols for Biomedical and Biotechnological Applications." Applied Sciences 11, no. 24 (2021): 11782. http://dx.doi.org/10.3390/app112411782.

Full text

Abstract:

Pulsed electric fields in the sub-microsecond range are being increasingly used in biomedical and biotechnology applications, where the demand for high-voltage and high-frequency pulse generators with enhanced performance and pulse flexibility is pushing the limits of pulse power solid state technology. In the scope of this article, a new pulsed generator, which includes four independent MOSFET based Marx modulators, operating individually or combined, controlled from a computer user interface, is described. The generator is capable of applying different pulse shapes, from unipolar to bipolar

APA, Harvard, Vancouver, ISO, and other styles

9

Giner, J., V. Gimeno, G. V. Barbosa-Cánovas, and O. Martín. "Effects of Pulsed Electric Field Processing on Apple and Pear Polyphenoloxidases." Food Science and Technology International 7, no. 4 (2001): 339–45. http://dx.doi.org/10.1106/mj46-8j9u-1h11-t0ml.

Full text

Abstract:

The feasibility of inhibiting polyphenoloxidase from apple and pear by pulsed electric field processing was evaluated. These treatments significantly lowered polyphenoloxidase activity of enzyme extracts from apple ( Golden deliciousvar.) and pear ( Blanquillavar.). Exponential decay pulses were generated by a laboratory scale electric pulse generator and applied in bipolar mode. Pulse duration was 0.02 ms and electric field intensities were up to 24.6 kV/cm. The temperature of samples never exceeded 15 ºC during pulsed electric field processing treatments. Polyphenoloxidase activities were re

APA, Harvard, Vancouver, ISO, and other styles

10

Nikitin, V. S., T. N. Ostanina, V. M. Rudoy, and N. I. Ostanin. "A Model Describing the Process of the Electrodeposition of Zinc Loose Deposits in Pulsed Current Modes." Электрохимия 59, no. 7 (2023): 391–403. http://dx.doi.org/10.31857/s0424857023070071.

Full text

Abstract:

A phenomenological model describing the change in the structural characteristics of loose zinc deposits obtained in pulsed current modes is presented. Comparison of experimental data on the structural properties of deposits with the results of model calculations indicates the adequacy of the model. To describe the features of the dendritic deposit growth and to determine the duration of the homogeneous structure formation in pulsed modes, the concept of critical thickness is introduced, at which a sharp change in the loose deposit density occurs. The dependence of the zinc deposit critical thi

APA, Harvard, Vancouver, ISO, and other styles

11

Miraval Zanon, A., F. Ambrosino, F. Coti Zelati, et al. "UV and X-ray pulse amplitude variability in the transitional millisecond pulsar PSR J1023+0038." Astronomy & Astrophysics 660 (April 2022): A63. http://dx.doi.org/10.1051/0004-6361/202243180.

Full text

Abstract:

The transitional millisecond pulsar PSR J1023+0038 is the first millisecond pulsar discovered to emit UV and optical pulses. Here we present the results of the UV and X-ray phase-resolved timing analysis of observations performed with the Hubble Space Telescope, XMM-Newton, and NuSTAR satellites between 2014 and 2021. Ultraviolet pulsations are detected in the high luminosity mode and disappear during low and flaring modes, similar to what is observed in the X-ray band. In the high mode, we find variability in both the UV and X-ray pulse amplitudes. The root mean square pulsed amplitude in the

APA, Harvard, Vancouver, ISO, and other styles

12

Bostanjoglo, O., F. Heinricht, and F. Wünsch. "Performance of A Laser-Pulsed Thermal Electron Gun." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 1 (1990): 124–25. http://dx.doi.org/10.1017/s0424820100179373.

Full text

Abstract:

High-speed electron microscopy strongly demands a high-brightness electron gun in order to increase the number of image forming electrons. A few years ago, a laser-pulsed high-brightness electron gun was introduced. Fig.1 shows the experimental set-up, A standard triode system was supplemented with a Nd:YAG laser, focussing optics and a modified anode, which incorporates the laser deflection mirror. The frequency doubled laser pulse (τ =5 ns, λ = 532 nm) is focused through a window onto the tip of the tungsten hairpin emitter. The laser treated area (≈ 100 μm diameter) is heated well above the

APA, Harvard, Vancouver, ISO, and other styles

13

Li, Zerui. "Analysis of the Principles and Applications of Ultra-intensity and Ultrashort Laser." Highlights in Science, Engineering and Technology 76 (December 31, 2023): 441–49. http://dx.doi.org/10.54097/9s9fm882.

Full text

Abstract:

With the development of laser technology, how to improve the output performance and peak power of lasers has become one of the hot directions of current research. This study analyzes the principles and applications of ultra-intensity and ultrashort pulse laser. It firstly outlines the development history of laser technology and the basic definition of ultra-intensity and ultrashort pulse laser. It also mentions the realization methods for generating ultra-intensity and ultrashort pulse lasers, such as mode-locked femtosecond oscillators and CPA-based femtosecond amplifiers. The paper describes

APA, Harvard, Vancouver, ISO, and other styles

14

Gao, Yuan, Pan Guo, Mengyin Xu, Zhiwei Feng, and Sha Wang. "Q-switched single-longitudinal-mode Nd:YAG laser based on composite mode selection mechanism." Laser Physics Letters 22, no. 5 (2025): 055001. https://doi.org/10.1088/1612-202x/adca98.

Full text

Abstract:

Abstract An electro-optical modulator (EOM) Q-switched Nd:YAG pulsed laser at 1.06 μm with single-longitudinal-mode (SLM) output is demonstrated. The enhancement of the longitudinal mode selection and the generation of SLM are provided by both the birefringence filtering technique by fine-tuning the EOM and the reflection interferometer compound cavity. The working principles of composite longitudinal mode suppression techniques are analyzed theoretically. Experimentally, we also verified that by using the composite longitudinal mode suppression techniques, the SLM operation with a high SLM ra

APA, Harvard, Vancouver, ISO, and other styles

15

Gribacheva, V., and S. Shcherbakov. "THE COOLING SYSTEM OF THE PERIODIC PULSED REACTOR." PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. SERIES: NUCLEAR AND REACTOR CONSTANTS 2021, no. 2 (2021): 256–67. http://dx.doi.org/10.55176/2414-1038-2021-2-256-267.

Full text

Abstract:

The paper proposes the configuration and composition equipment of the cooling system of the designed periodic pulsed reactor (PPR) of high power. The special features of the PPR are a small flow section, a large heating of the coolant in the power pulse and the impossibility of useful use of thermal energy in the periodic mode of operation. Liquid lithium is proposed as a coolant and heat is discharged through air heat exchangers (AHE). The goal was to achieve compactness and low power consumption, the ability to work with frequent stops and optimize the operation of equipment in pulse modes.

APA, Harvard, Vancouver, ISO, and other styles

16

Chernyshova, O. V., T. B. Yelemessov, and D. V. Drobot. "Application of pulse current for dissolution of heat-resistant GS32-VI alloy." Fine Chemical Technologies 16, no. 5 (2021): 438–47. http://dx.doi.org/10.32362/2410-6593-2021-16-5-438-447.

Full text

Abstract:

Objectives. To identify the regularities of electrochemical processing of the heat-resistant GS32-VI alloy in a sulfuric acid electrolyte with a concentration of 100 g/dm3 under the action of a pulsed current in a pulsed mode.Methods. Using the electrochemical technological complex EHK-1012 (developed by IP Tetran) and a non-compensatory method of measuring potential, polarization and depolarization curves with a change in pulse duration and a pause between them were recorded. The current pulses had an amplitude ranging from 0 to 3.5 A (when recording the polarization and depolarization curves

APA, Harvard, Vancouver, ISO, and other styles

17

Mohamad Rashid, Nur Nadhirah, Harith Ahmad, Mohammad Faizal Ismail, et al. "Nanotubes in Chitin Mode Locker for Passive Mode−Locked Fibre Laser in 2.0 µm Region." Photonics 10, no. 3 (2023): 257. http://dx.doi.org/10.3390/photonics10030257.

Full text

Abstract:

This research demonstrated an ultrafast passively mode-locked thulium-holmium doped fibre laser (THDFL) using a carbon nanotube (CNT)-chitin composite film as a saturable absorber (SA). The CNTs were fabricated using ultrasonic-assisted liquid-phase exfoliation, and the chitin biopolymer was derived from oyster mushrooms (Pleurotus Ostreatus). The free-standing SA successfully performed a mode-locking operation at a threshold input pump power of 203 mW with an operating wavelength of 1908.53 nm. The generated mode-locked pulses had repetition rate, pulse width, and signal-to-noise ratio (SNR)

APA, Harvard, Vancouver, ISO, and other styles

18

Anischenko I.V., Pokrovskii S.V., Osipov M.A., Abin D.A., Gritsaenko D. I., and Rudnev I. A. "Nonequilibrium states in the second-generation HTS composites under overcritical pulsed current impact." Technical Physics Letters 48, no. 13 (2022): 43. http://dx.doi.org/10.21883/tpl.2022.13.53352.18828.

Full text

Abstract:

This paper presents the results of studying the processes of epy HTS composites switching from the superconducting to the resistive state at microsecond current pulses. Two modes of pulsed current load were used: with an amplitude of ~1.1Ic (the so-called "soft" mode) and with an amplitude of ~3Ic ("hard" mode). The possibility of passing supercritical currents through the tape without superconductor characteristics degradation is shown. To explain the processes occurring in the tape during the current pulse, 2D FEA (finite element analyzes) was developed, with the help of which the dynamic re

APA, Harvard, Vancouver, ISO, and other styles

19

Tingting Lu, Tingting Lu, Juntao Wang Juntao Wang, Xiaolei Zhu Xiaolei Zhu, Ren Zhu Ren Zhu, Huaguo Zang Huaguo Zang, and Weibiao Chen Weibiao Chen. "Highly efficient single longitudinal mode-pulsed green laser." Chinese Optics Letters 11, no. 5 (2013): 051402–51404. http://dx.doi.org/10.3788/col201311.051402.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Butylskii, Dmitrii, Ilya Moroz, Kseniya Tsygurina, and Semyon Mareev. "Effect of Surface Inhomogeneity of Ion-Exchange Membranes on the Mass Transfer Efficiency in Pulsed Electric Field Modes." Membranes 10, no. 3 (2020): 40. http://dx.doi.org/10.3390/membranes10030040.

Full text

Abstract:

Despite the growing interest in pulsed electric field modes in membrane separation processes, there are currently not many works devoted to studying the effect of the surface properties and composition of ion-exchange membranes on their efficiency in these modes. In this paper, we have shown the effect of increasing mass transfer using different kinds of ion-exchange membranes (heterogeneous and homogeneous with smooth, undulated, and rough surfaces) during electrodialysis in the pulsed electric field modes at underlimiting and overlimiting currents. It was found that the maximum increment in

APA, Harvard, Vancouver, ISO, and other styles

21

Fischer, Baruch, Boris Vodonos, Shimie Atkins, and Alexander Bekker. "Dispersion-mode pulsed laser." Optics Letters 25, no. 10 (2000): 728. http://dx.doi.org/10.1364/ol.25.000728.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Holzwarth, Michael J., Alexander M. Gigler, and Othmar Marti. "Digital Pulsed Force Mode." Imaging & Microscopy 8, no. 4 (2006): 37–38. http://dx.doi.org/10.1002/imic.200790065.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Анищенко, И. В., С. В. Покровский, М. А. Осипов, Д. А. Абин, Д. И. Грицаенко та И. А. Руднев. "Неравновесные состояния в ВТСП-композитах второго поколения при сверхкритических импульсных токовых воздействиях". Письма в журнал технической физики 47, № 19 (2021): 22. http://dx.doi.org/10.21883/pjtf.2021.19.51508.18828.

Full text

Abstract:

This paper presents the results of studying the processes of еру HTS composites switching from the superconducting to the resistive state at microsecond current pulses. Two modes of pulsed current load were used: with an amplitude of ~ 1.1 Ic (the so-called "soft" mode) and with an amplitude of ~ 3 Ic ("hard" mode). The possibility of passing supercritical currents through the tape without superconductor characteristics degradation is shown. To explain the processes occurring in the tape during the current pulse, 2D FEA (finite element analyzes) was developed, with the help of which the dynami

APA, Harvard, Vancouver, ISO, and other styles

24

Guo, Silin, Yajun Lou, Cai Yue, Xinhai Zhang, and Fan Zhang. "Ultrafast Airy Beam Generation with a Mode-Locked Fiber Laser." Photonics 12, no. 1 (2024): 9. https://doi.org/10.3390/photonics12010009.

Full text

Abstract:

We generate an ultrafast Airy beam with a mode-locked fiber laser. A diffractive optical element is placed inside the laser cavity and applies phase modulation on the pulses propagating in the cavity. The pulsed Airy beam is then obtained by Fourier transform of the first order diffracted beam of the diffractive optical element. The experimental results show that the beam profile and propagation characteristics of the laser pulses are consistent with the theoretical analysis. The pulsed Airy beam fiber laser we constructed has the advantages of compactness, easy integration, low cost, and high

APA, Harvard, Vancouver, ISO, and other styles

25

Li, DongCheng. "Femtosecond pulsed laser technology and applications." Theoretical and Natural Science 28, no. 1 (2023): 166–73. http://dx.doi.org/10.54254/2753-8818/28/20230347.

Full text

Abstract:

This paper describes femtosecond pulsed laser technology and related applications. The focus is on two core femtosecond pulsed laser technologies: femtosecond pulsed laser generation and amplification. In the generation of femtosecond pulsed lasers, mode-locking techniques, Kerr-lens mode-locking, and semiconductor saturable absorber mirrors are presented; in the amplification of femtosecond pulsed lasers, chirped-pulse amplification and coherent synthesis techniques are presented. This paper analyses the applications of femtosecond pulsed lasers in both the biomedical and manufacturing sector

APA, Harvard, Vancouver, ISO, and other styles

26

Naidis, G. V., and N. Yu Babaeva. "Modeling of repetitively pulsed low-pressure CO₂ discharges." Physics of Plasmas 29, no. 4 (2022): 044501. http://dx.doi.org/10.1063/5.0087197.

Full text

Abstract:

A model of repetitively pulsed low-pressure CO2 discharges is developed. In the framework of this model, plasma characteristics (electric field, electron density, gas temperature, and vibrational temperature of the asymmetric mode) are calculated both during the pulses and in the afterglow periods. The CO2 conversion factor in repetitively pulsed discharges is calculated. Results of computation of plasma parameters and of the conversion factor agree with available experimental data.

APA, Harvard, Vancouver, ISO, and other styles

27

Liu, Ching-Yao, Chih-Chiang Wu, Li-Chuan Tang, et al. "Design of High Peak Power Pulsed Laser Diode Driver." Photonics 9, no. 9 (2022): 652. http://dx.doi.org/10.3390/photonics9090652.

Full text

Abstract:

This paper attempts to describe a laser diode driver circuit using the depletion mode gallium nitride high electron mobility transistor (D-mode GaN HEMT) to generate nanosecond pulses at a repetition rate up to 10 MHz from the vertical-cavity surface-emitting laser (VCSEL). The feature of this driver circuit is a large instantaneous laser power output designed in the most efficient way. The design specifications include a pulse duration between 10 ns and 100 ns and a peak power up to above 100 W. The pulsed laser diode driver uses the D-mode GaN HEMT, which has very small Coss difference betwe

APA, Harvard, Vancouver, ISO, and other styles

28

Kamynin, Vladimir, Vitalii Kashin, Dmitri Nikolaev, Anton Trikshev, and Vladimir Tsvetkov. "A Laser with Intracavity Spectral Beam Combining with Continuous-Wave and Pulse-Periodic Pumping of Various Lasing Channels." Photonics 10, no. 12 (2023): 1389. http://dx.doi.org/10.3390/photonics10121389.

Full text

Abstract:

The output spectral, temporal, and spatial parameters of a two-channel Yb-fiber laser operating in an incoherent intracavity spectral beam-combining mode were investigated. One of the laser channels operated in continuous pumping mode, and the second channel operated in pulse-periodic pumping mode with a pulse duration of microseconds. When the channels operated separately, continuous lasing at a wavelength of λ1 was observed in one channel, and pulsed lasing at a wavelength of λ2 was observed in the other. When both channels operated simultaneously, it was shown that during the pump pulse act

APA, Harvard, Vancouver, ISO, and other styles

29

Tan, Xin, Ya Liu, Yongkang Zheng, Zewu Xie, and Guoqing Hu. "Revealing the Evolution from Q-Switching to Mode-Locking in an Erbium-Doped Fiber Laser Using Tungsten Trioxide Saturable Absorber." Photonics 9, no. 12 (2022): 962. http://dx.doi.org/10.3390/photonics9120962.

Full text

Abstract:

Passively Q-switching and mode-locking technologies can generate short pulses with durations that differ by several orders of magnitude widely used in different applications. Recently, Q-switching and mode-locking realized in an identical laser cavity with saturable absorbers was reported. The analysis of pulse conversion is helpful for us to further understand the pulse dynamics of a laser. In this paper, the pulse evolution from Q-switching, Q-switched mode-locking to mode-locking, is demonstrated by using a tungsten trioxide saturable absorber in a ring-cavity erbium-doped fiber laser. Firs

APA, Harvard, Vancouver, ISO, and other styles

30

Godun, D. V., S. V. Bordusau, and G. P. Budzko. "Output Current Control System of a High Voltage Electric Pulse Generator for Plasma Excitation." PLASMA PHYSICS AND TECHNOLOGY 6, no. 1 (2019): 7–9. http://dx.doi.org/10.14311/ppt.2019.1.7.

Full text

Abstract:

A control and pulse discharge current limiting system integrated into an AC/DC converter and pulse modulator of a high voltage pulse generator have been developed. The peculiarity of such system\textquotesingle s operation is the stabilization of the power supplied to the discharge and the correction of the width of output electric pulses towards decrease upon reaching the specified pulsed current amplitude value. The system enables the pulse generator to work in the modes close to the ``short circuited load'' mode. In this case the driving module of a composite IGBT key performs the correctio

APA, Harvard, Vancouver, ISO, and other styles

31

Ahmed, N., S. Omar, NF Zulkipli, et al. "The generation of nanosecond pulses at C-band region with titanium dioxide as a saturable absorber." Journal of Physics: Conference Series 2075, no. 1 (2021): 012013. http://dx.doi.org/10.1088/1742-6596/2075/1/012013.

Full text

Abstract:

Abstract A passive mode-locked in an erbium-doped fiber laser with titanium dioxide (TiO2) film as a saturable absorber (SA) has been successfully demonstrated. The film is fabricated using a liquid phase exfoliation, which offers a simple and low-cost method. The self-starting mode-locked was created by inserting a 200-meter-long single-mode fiber into the laser cavity to balance the nonlinearity and dispersion of the cavity. The pulses operate stably at a central wavelength of 1560 nm. The pulse repetition rate was almost fixed at 988 kHz at a tuneable pump power from 145.83 mW to 187.04 mW.

APA, Harvard, Vancouver, ISO, and other styles

32

Pudwat, S., P. Rakkwamsuk, and S. Damrongrattana. "Self-Cleaning Properties of TiO₂ Films Deposited by Reactive Magnetron Sputtering Using Smooth D.C. and Pulsed D.C. Source." Advanced Materials Research 55-57 (August 2008): 453–56. http://dx.doi.org/10.4028/www.scientific.net/amr.55-57.453.

Full text

Abstract:

he TiO2 films were prepared by reactive smooth d.c. and pulsed d.c. magnetron sputtering on glass slide substrates. A metallic titanium target was reactively sputtered in a mixture of argon and oxygen. The influence of smooth d.c. and pulsed d.c. discharge power on films thickness, crystallinity, surface morphology, photocatalytic activity (methylene blue degradation) and hydrophilic activity were studied. At pulsed d.c. sputtering, plasma generator has been used to provide the asymmetric pulsed d.c. bias of the target at 100 kHz and pulsed off-time 4016ns. The structures of the films at 100nm

APA, Harvard, Vancouver, ISO, and other styles

33

Ivankov, Anton S., Anastasia M. Kozhevnikova, Dmitry V. Schitz, and Igor V. Alekseenko. "Investigation of Nonthermal Plasma Jet Excitation Mode and Optical Assessment of Its Electron Concentration." Applied Sciences 11, no. 19 (2021): 9203. http://dx.doi.org/10.3390/app11199203.

Full text

Abstract:

The results of a study of a plasma jet of atmospheric-pressure helium driven by a capacitive discharge using sine and pulsed modes of excitation are presented. The homogeneous discharge of a multi-channel plasma jet at gas temperature of 34 °C and helium flow rate of 0.5 L/min was achieved with short pulse excitation. A digital holography method is proposed to estimate a basic plasma parameter, i.e., its electron concentration. An automated digital holographic interferometry set-up for the observation and study of a nonthermal plasma jet in a pulse mode is developed and described. The synchron

APA, Harvard, Vancouver, ISO, and other styles

34

Jiang Pei-heng, Shi Chao-du, Fu Shi-jie та ін. "130 μJ linear-polarized single-frequency 12-μm-core Er/Yb co-doped fiber amplifier based on pre-shaped seed pulse". Acta Physica Sinica 74, № 2 (2025): 0. https://doi.org/10.7498/aps.74.20241371.

Full text

Abstract:

Stimulated Brillouin scattering (SBS) is the major barrier in the process of energy scaling for pulsed single-frequency fiber MOPA. Due to gain saturation effect, the laser pulse profile will be gradually distorted with the increase of pump power, which induces steep leading edge and narrower width for the amplified pulses. The resulting laser peak power would increase rapidly and thus the SBS threshold is reached earlier to limit the amplification of pulse energy.<br>A method to obtain high-energy pulsed single-frequency laser by pulse pre-shaping is demonstrated in this work. By design

APA, Harvard, Vancouver, ISO, and other styles

35

Афанасьєва, Ольга Валентинівна, Наталія Олексіївна Лалазарова та Олена Георгіївна Попова. "Нові технології лазерної поверхневої обробки". Aerospace technic and technology, № 2 (28 квітня 2021): 59–65. http://dx.doi.org/10.32620/aktt.2021.2.07.

Full text

Abstract:

Subject and purpose. Currently, gas, solid-state, and fiber lasers are used to process materials in the aviation industry. For the thermal treatment of steels, gas CO2 lasers with a capacity of more than 1 kW used, which are reliable in operation but have high cost and low efficiency. There are no results on the use of low-power (up to 20 W) pulsed-mode lasers for surface hardening of steel products. The purpose of this work is to determine the modes of surface hardening of products from carbon and alloy steels using low-power solid-state pulsed YAG lasers. Methodology. For laser hardening, a

APA, Harvard, Vancouver, ISO, and other styles

36

Hung, Tsung Pin, Chao Ming Hsu, Ah Der Lin, and Jao Hwa Kuang. "Residual Stress and Bead Profile Analysis of Pulsed Nd:YAG Laser Lap Welding." Applied Mechanics and Materials 284-287 (January 2013): 915–18. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.915.

Full text

Abstract:

The weld bead temperature distribution and shape during pulsed Nd:YAG laser lap welding are studied. A volumetric heat source model is derived to include the surface flux and the keyhole heat transfer effects in the pulsed laser lap welding process. The proposed pulsed laser heat transfer mode is employed in a simulation with the commercial finite element software Marc. The numerically computed results of the weld pool dimensions are compared with the experimental results. The comparison shows a good agreement between the simulated and measurement results, indicating that the proposed model is

APA, Harvard, Vancouver, ISO, and other styles

37

Yang, Li Jun, Xiao Liang Cheng, Gen Wang Wang, Qing Ming Xue, Ye Ding, and Yang Wang. "Experimental Evaluation of Cutting Quality of Carbon Fibre Reinforced Polymer with Pulsed Laser." Applied Mechanics and Materials 868 (July 2017): 172–77. http://dx.doi.org/10.4028/www.scientific.net/amm.868.172.

Full text

Abstract:

To investigate the cutting quality of Carbon Fibre Reinforced Polymer (CFRP) with pulsed laser, experiments of high modulus CFRP were carried out using a Nd: YAG pulsed laser with wavelength of 1064nm. Experiments with five factors and five levels were designed to apply the response surface methodologies (RSM). The influence rule of processing parameters consisting scanning speed, pulse frequency, pulse energy, pulse duration and gas pressure on the morphology of machining region including the kerf width, kerf taper and the width of heat affected zone were studied, and the interactions of thes

APA, Harvard, Vancouver, ISO, and other styles

38

Saifutdinova, A. A., B. A. Timerkaev, and A. I. Saifutdinov. "Numerical study of transient processes in a corona dc microdischarge." Izvestiya vysshikh uchebnykh zavedenii. Fizika, no. 1 (2022): 143–55. http://dx.doi.org/10.17223/00213411/65/1/143.

Full text

Abstract:

An extended fluid model is formulated that describes a corona microdischarge at atmospheric pressure in argon, taking into account the heating of the cathode-tip. Numerical calculations have been carried out, demonstrating two main modes of the negative corona: repetitively pulsed and glow discharge mode. For both modes, all the main parameters of the corona discharge plasma were obtained. It is shown that the appearance of Trichel pulses is in many respects similar to the transition from the Townsend to the glow discharge mode and is similar to self-oscillations manifested in a classical disc

APA, Harvard, Vancouver, ISO, and other styles

39

Куропаткин, Ю. П., В. И. Нижегородцев, И. Н. Романов та ін. "Мобильный ускоритель на базе безжелезного импульсного бетатрона для радиографирования динамических объектов". Журнал технической физики 92, № 2 (2022): 297. http://dx.doi.org/10.21883/jtf.2022.02.52021.196-21.

Full text

Abstract:

The paper concerns the mobile accelerator based on the ironless pulsed betaron. The accelerator is aimed to radiograph dynamic objects with a large optical thickness. It has a possibility to obtain up to three γ-pulses in one cycle of the acceleration. The accelerator operation description and results of its testing powering in a single-pulse mode are provided. The estimated boundary energy of an electron beam is equal to 60 MeV at the capacitance value of 1.8 mF of the storage of the betatron electromagnet pulsed power system. The thickness of the lead test object examined with γ-rays is 140

APA, Harvard, Vancouver, ISO, and other styles

40

Laskovnev, A. P., M. I. Markevich, A. N. Malyshko, V. I. Zhuravleva, and A. M. Chaplanov. "Formation of colloidal solutions of silicon nanoparticles in ethyl alcohol with ultra-short laser pulses." Proceedings of the National Academy of Sciences of Belarus, Physical-Technical Series 66, no. 1 (2021): 7–11. http://dx.doi.org/10.29235/1561-8358-2021-66-1-7-11.

Full text

Abstract:

The study of surface morphology of a silicon target after laser exposure, the formation and study of nanoparticles, obtained by laser ablation by ultrashort infrared pulses, were conducted. The material was processed using a yttrium aluminum garnet laser (LS-2134D) with a wavelength of 1064 nm, generating in a two-pulse mode (pulses are separated by a time interval of 3 μs, pulse duration is 10 ns, pulse repetition rate is 10 Hz, single pulse energy ~ 0.05 J). Alcohol solutions of silicon nanoparticles were obtained by laser ablation. It is shown that an ensemble of particles of different size

APA, Harvard, Vancouver, ISO, and other styles

41

Braun, Edward. "Reducing Radiation Exposure in Lumbar Transforaminal Epidural Steroid Injections with Pulsed Fluoroscopy: A Randomized, Doubleblind, Controlled Clinical Trial." January 2018 1, no. 21;1 (2018): 53–60. http://dx.doi.org/10.36076/ppj.2018.1.53.

Full text

Abstract:

Background: Fluoroscopy-guided lumbar transforaminal epidural steroid injections (L-TFESI) result in radiation exposure that carries risks to patients, physicians, and procedural staff. Objective: We aim to evaluate the feasibility of using pulsed fluoroscopy to safely reduce radiation exposure during L-TFESI. Study Design: This is a prospective, double-blind, randomized controlled trial. Setting: This study took place in a single-center, academic, outpatient interventional pain management clinic. Methods: Patients undergoing L-TFESI were randomly assigned to either continuous mode fluoroscopy

APA, Harvard, Vancouver, ISO, and other styles

42

Rakhadilov, B. K., D. B. Buitkenov, M. Adilkhanova, Zh B. Sagdoldina, and Sh R. Kurbanbekov. "Influence of pulse plasma treatment on the phase composition and microhardness of detonation coatings based on Ti-Si-C." Bulletin of the Karaganda University. "Physics" Series 102, no. 2 (2021): 33–39. http://dx.doi.org/10.31489/2021ph2/33-39.

Full text

Abstract:

The paper considers the study results of the phase composition and microhardness of detonation coatings based on Ti-Si-C after exposure to pulsed plasma treatment. The CCDS2000 detonation complex was used to obtain the coatings. Coatings surface modification was carried out using pulsed plasma exposure (PPE). The detonation coatings were treated with varying the distance H (30 mm mode 1, 40 mm mode 2, 50 mm mode 3) from the plasmatron to the hardened surface. It is shown that the treated coatings are generally characterized by high microhardness compared to the original coating. It was determi

APA, Harvard, Vancouver, ISO, and other styles

43

Zhang, Qin, Wei Shi, Cheng Ma, and Lei Yang. "Evaluation of Pulsed Spark Discharge for Triggering GaAs Photoconductive Semiconductor Switches." Electronics 11, no. 18 (2022): 2954. http://dx.doi.org/10.3390/electronics11182954.

Full text

Abstract:

In this study, a 3 mm gap GaAs photoconductive semiconductor switch (GaAs PCSS) was triggered by pulsed spark discharge. The typical linear mode of GaAs PCSS was fulfilled at a low bias voltage. The on-state current waveform was similar to that of an optical pulse. The “nonlinear mode” was demonstrated at a bias voltage of 4 kV; concurrently, the peak current and the carriers’ multiplication rate were 33 A and 179, respectively. This study indicates that pulsed spark discharge is a promising candidate light source for the direct triggering of GaAs PCSSs.

APA, Harvard, Vancouver, ISO, and other styles

44

Li, Zheng, Zhiwei Shi, and Hai Du. "Analytical Model: Characteristics of Nanosecond Pulsed Plasma Synthetic Jet Actuator in Multiple-Pulsed Mode." Advances in Applied Mathematics and Mechanics 9, no. 2 (2017): 439–62. http://dx.doi.org/10.4208/aamm.2015.m1297.

Full text

Abstract:

AbstractMulti-field coupling simulation method based on the physical principles is used to simulate the discharge characteristics of nanosecond pulsed plasma synthetic jet actuator. Considering the effect of the energy transferring for air, the flow characteristics of nanosecond pulsed plasma synthetic jet actuator are simulated. The elastic heating sources and ion joule heating sources are the two main sources of energy. Through the collisions, the energy of ions is transferred to the neutral gas quickly. The flow characteristics of a series of blast waves and the synthetic jet which erupt fr

APA, Harvard, Vancouver, ISO, and other styles

45

Ahmad, Harith, Nur Atikah Azali, Leonard Bayang, and Norazriena Yusoff. "Generation of mode-locked thulium/holmium-doped fiber laser assisted by bismuthene/side polished fiber as saturable absorber." Laser Physics Letters 19, no. 7 (2022): 075103. http://dx.doi.org/10.1088/1612-202x/ac6804.

Full text

Abstract:

Abstract An all-fiber passively mode-locked laser is demonstrated near the 2.0 µm wavelength region utilizing thulium/holmium-doped fiber as the gain medium and bismuthene/side-polished fiber (SPF) as saturable absorber (SA). The effect of bismuthene concentration on the performance of the generated mode-locked lasers has also been investigated. In this work, bismuthene was obtained by the exfoliation of bismuth under the ultrasonication technique. Two different concentrations of bismuthene (10 and 20 mg ml−1) were prepared to coat the SPF and be further used as SA. Based on the experimental r

APA, Harvard, Vancouver, ISO, and other styles

46

Badziak, J., A. Dubicki, and R. Jarocki. "Short single-mode CO2 laser pulse generation by pulsed Q-switching." Optics & Laser Technology 25, no. 2 (1993): 133–37. http://dx.doi.org/10.1016/0030-3992(93)90109-s.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Fei, Chen, Huo Yu-Jing, He Shu-Fang, and Feng Li-Chun. "Diode-Pumped Nanosecond Pulsed Laser with Pulse-Transmission-Mode Q -Switch." Chinese Physics Letters 18, no. 2 (2001): 228–29. http://dx.doi.org/10.1088/0256-307x/18/2/325.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Li, Feng, Chao Gao, Bo Rui Zheng, and Yu Shuai Wang. "Study of the Boundary Layer on a Plate Aerodynamically Induced by Multiple DBD Plasma Based on PIV." Applied Mechanics and Materials 421 (September 2013): 163–67. http://dx.doi.org/10.4028/www.scientific.net/amm.421.163.

Full text

Abstract:

The boundary layer aerodynamic flow acceleration with one atmosphere uniform induced by multiple dielectric-barrier-discharge plasma actuation were studied based on PIV. Through double actuators alternating discharge, the multiple dielectric barrier discharge mode have been proposed and tested. The efficiencies of the plasma actuators in Pulsed-pulsed, Steady-steady, Pulsed-steady and Steady-pulsed discharge modes were explored. Based on the above results, the boundary layer flow acceleration performance of multiple plasma actuators has been discussed and the more efficient discharge pattern h

APA, Harvard, Vancouver, ISO, and other styles

49

Tehrani, P. H., L. G. Hector,, R. B. Hetnarski, and M. R. Eslami. "Boundary Element Formulation for Thermal Stresses During Pulsed Laser Heating." Journal of Applied Mechanics 68, no. 3 (2000): 480–89. http://dx.doi.org/10.1115/1.1365155.

Full text

Abstract:

Pulsed lasers are used in a variety of materials processing applications that range from heating for metallurgical transformation to scribing vehicle identification numbers on anodized aluminum strips. These lasers are commonly configured to deliver a large quantity of heat energy in very short time intervals and over very small areas due to the manner in which radiant energy is stored within, and then released from, the laser resonator. At the present time, little is known about the effect of pulse duration on thermomechanical distortion during heating without phase change. To explore this is

APA, Harvard, Vancouver, ISO, and other styles

50

Brunel, Marc, Olivier Emile, Mehdi Alouini, Albert Le Floch, and Fabien Bretenaker. "Self-mode-locked pulsed monomode laser." Optics Letters 24, no. 4 (1999): 229. http://dx.doi.org/10.1364/ol.24.000229.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!