Recent Advances in Ultrafast Laser Pulses

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Optics and Lasers".

Deadline for manuscript submissions: 20 May 2024 | Viewed by 1571

Special Issue Editor

School of Electronic and Computer Engineering, Peking University, Shenzhen 518055, China
Interests: ultrafast optics; nonlinear optics; integrated optics

Special Issue Information

Dear Colleagues,

Ultrafast laser pulses are widely demanded in the biomedical field and for materials processing because of their large peak power and capability for ultrahigh-precision fabrication. The duration of ultrafast laser pulses is typically defined as several tens of femtoseconds to tens of picoseconds. Ultrafast pulses are usually generated by passive mode-locked lasers or optical parametric amplifiers, and can also be obtained by pulse compression using longer pulses. Obtaining stable ultrafast laser pulses and the physical mechanism of pulse formation are very important research issues.

Topics to be discussed in this Special Issue include but are not limited to: ultrafast pulse formation in mode-locked lasers or micro-ring resonant cavities, ultrashort pulse generation with pulse compression techniques, interaction of ultrafast laser pulses with materials, nonlinear interactions between ultrashort pulses, supercontinuum generation, and noise and stability of ultrafast laser pulses.

Dr. Qian Li
Guest Editor

Manuscript Submission Information

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Keywords

  • ultrafast laser pulses
  • mode-locked laser
  • supercontinuum generation
  • low-noise laser
  • pulse compression

Published Papers (2 papers)

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Research

12 pages, 5132 KiB  
Article
Multi-Electron Ionization and Coulomb Explosion of the IBr Molecule in the Near-Infrared Femtosecond Laser Field
by Botong Liu, Zhipeng Li, Zhenrong Sun and Yan Yang
Appl. Sci. 2023, 13(24), 13185; https://doi.org/10.3390/app132413185 - 12 Dec 2023
Viewed by 509
Abstract
The DC-sliced ion velocity map imaging approach was used to analyze the multi-electron ionization and subsequent Coulomb explosion of an IBr molecule exposed to a near-infrared femtosecond laser field. The existence of the molecular ions up to IBr7+ was observed in the [...] Read more.
The DC-sliced ion velocity map imaging approach was used to analyze the multi-electron ionization and subsequent Coulomb explosion of an IBr molecule exposed to a near-infrared femtosecond laser field. The existence of the molecular ions up to IBr7+ was observed in the experiment, and a series of Coulomb explosion channels are assigned. According to the “ladder-path” ionization model, the multi-electron ionization paths of IBr molecules are determined. We find that the charge transfer process does not occur during ionization, and the presence of higher charge states can be explained by considering the higher-order ionization process. Full article
(This article belongs to the Special Issue Recent Advances in Ultrafast Laser Pulses)
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14 pages, 5907 KiB  
Article
Chirped-Pulse Amplification in an Echo-Enabled Harmonic-Generation Free-Electron Laser
by Li Zeng, Xiaofan Wang, Yifan Liang, Huaiqian Yi, Weiqing Zhang and Xueming Yang
Appl. Sci. 2023, 13(18), 10292; https://doi.org/10.3390/app131810292 - 14 Sep 2023
Viewed by 814
Abstract
The field of ultrafast science has experienced significant growth over the last decade, largely attributed to advancements in optical and laser technologies such as chirped-pulse amplification and high-harmonic generation. The distinctive characteristics of intense ultrafast free-electron lasers (FELs) have introduced novel prospects for [...] Read more.
The field of ultrafast science has experienced significant growth over the last decade, largely attributed to advancements in optical and laser technologies such as chirped-pulse amplification and high-harmonic generation. The distinctive characteristics of intense ultrafast free-electron lasers (FELs) have introduced novel prospects for investigating molecular dynamics, as well as providing an opportunity to gain deeper insights into nonlinear processes in materials. Therefore, high-power ultrafast FELs can be widely used for both fundamental research and practical applications. This study presents a novel approach for producing high-power femtosecond FEL pulses, utilizing chirped-pulse amplification in echo-enabled harmonic generation. Chirped seed pulses are employed to induce frequency-chirped energy modulation in the electron beam. The generated FEL pulse, which inherits the chirped frequency, can be compressed through the gratings in the off-plane mount geometry to provide ultraintense ultrafast pulses. The numerical modeling results indicate that peak power exceeding 20 GW and a pulse duration in the order of several femtoseconds can be achieved. Full article
(This article belongs to the Special Issue Recent Advances in Ultrafast Laser Pulses)
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