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Photonics
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Ultrafast Laser and Micro-Nano Machining
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Ultrafast Laser and Micro-Nano Machining

A special issue of Photonics (ISSN 2304-6732).

Deadline for manuscript submissions: closed (15 September 2023) | Viewed by 6312

Special Issue Editor

Prof. Dr. Houkun Liang

E-Mail Website
Guest Editor
College of Electronics and Information Engineering, Sichuan University, No.24 South Section 1, Yihuan Road, Chengdu 610065, China
Interests: high-field optics; high-power mid-infrared (MIR) laser; ultrafast few-cycle lasers; deep UV lasers; nonlinear optics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Research on ultrafast lasers and the corresponding light-matter interaction represents an emerging frontier. In the recent decade, ultrafast lasers with unique specifications such as spectral range (UV to THz), pulse width (ps to a few cycles), and average power (hundreds of or even kilowatts) have been explored. Subsequently, more advanced applications of light-matter interaction based on the developed ultrafast lasers are pursued, and among which ultrafast laser micro-nano machining has both great scientific value and remarkable industrial impact. With special ultrafast lasers, laser-matter interaction in the territories of new materials for instance alloys, transparent materials, composite materials, biomaterials, new specifications such as extreme aspect ratio, and new functions for example fabrication of three-dimensional structures and microfluid channels, could be investigated. The purpose of this Special Issue is to highlight the progress in ultrafast laser and its applications in light-matter interaction and micro-nano machining.

Topics include:

  • Novel ultrafast lasers
  • High-power ultrafast amplifiers
  • Mid-infrared and terahertz ultrafast lasers
  • Light-matter interaction based on novel ultrafast lasers
  • Micro-nano machining based on advanced ultrafast lasers

Dr. Houkun Liang
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Photonics is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (3 papers)

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Research

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8 pages, 2072 KiB  
Communication
Suppression of Pulse Intensity Dependent Dispersion during Nonlinear Spectral Broadening with Intermediate Compression for Passive CEP Stable Pulse Generation
by Hushan Wang, Huabao Cao, Yishan Wang, Wei Zhao and Yuxi Fu
Photonics 2022, 9(10), 761; https://doi.org/10.3390/photonics9100761 - 12 Oct 2022
Viewed by 1310
Abstract
The intensity fluctuation induced spectral phase-change of the laser pulse during nonlinear spectral broadening is theoretically investigated. The oscillation of the phase-change curves at the central part of the spectra is explained by the two-wave interference model, while the bending of the phase-change [...] Read more.
The intensity fluctuation induced spectral phase-change of the laser pulse during nonlinear spectral broadening is theoretically investigated. The oscillation of the phase-change curves at the central part of the spectra is explained by the two-wave interference model, while the bending of the phase-change curves at the wings is considered to originate from the intensity dependent dispersion caused by the self-steepening (SST) effect. Both of them can degrade carrier envelop phase (CEP) stability after an intra-pulse difference frequency generation (IP-DFG) setup. We propose an effective approach to suppress the intensity dependent dispersion with intermediate compression. Verified by numerically simulations, well-phased spectral components at the wings can be obtained, which is highly beneficial for CEP stable pulse generation with noisy input. Full article
(This article belongs to the Special Issue Ultrafast Laser and Micro-Nano Machining)
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13 pages, 10559 KiB  
Article
Research on the Ablation Characteristics and Thermomechanical Coupling Matching of Continuous-Wave/Pulsed Combined Lasers
by Jing Xiao, Guoying Feng, Gang Ren, Jinhua Han, Huijun Xia, You Wang, Wantao Deng, Tianyu Chen and Rongjun Guo
Photonics 2022, 9(10), 679; https://doi.org/10.3390/photonics9100679 - 21 Sep 2022
Viewed by 1909
Abstract
In laser processing and electro-optical countermeasures, the laser ablation efficiency on the target is of great importance. Compared with traditional single laser irradiation, ablation by continuous-wave (CW)/pulsed combined laser has the advantages of high ablation efficiency, strong controllability, and low laser energy output [...] Read more.
In laser processing and electro-optical countermeasures, the laser ablation efficiency on the target is of great importance. Compared with traditional single laser irradiation, ablation by continuous-wave (CW)/pulsed combined laser has the advantages of high ablation efficiency, strong controllability, and low laser energy output requirements. However, current research on the synergistic mechanism and matching of combined laser irradiation requires improvement. In this study, damage experiments were mainly conducted on two modes of combined laser, CW/millisecond (CW/ms) and CW/nanosecond (CW/ns) laser. The temperature distribution, ablation rate, and ablation range under different irradiation conditions were tested quantitatively. The ablation characteristics and thermomechanical coupling matching of the combined laser were analysed and physically modelled. The results showed that compared with the pulsed laser alone, the ablation rate of the CW/ms combined mode was greater by approximately one order of magnitude, while that of the CW/ms combined mode was greater by approximately three orders of magnitude. Moreover, the thermomechanical coupling matching of the combined laser can be regarded as the matching of the impact pressure distribution of the pulsed laser with the range of the melting pool. The results of this study may offer guidance for further improving the synergistic enhancement damage mechanism of the combined laser. Full article
(This article belongs to the Special Issue Ultrafast Laser and Micro-Nano Machining)
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Review

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24 pages, 8440 KiB  
Review
Structured Light Laser Based on Intra-Cavity Modulation
by Pan Guo and Sha Wang
Photonics 2023, 10(1), 1; https://doi.org/10.3390/photonics10010001 - 21 Dec 2022
Cited by 3 | Viewed by 2382
Abstract
Structured light fields carrying orbital angular momentum (OAM) have been widely studied, and a variety of applications have been found. The exploration of the generation of the structured light beams with higher purity, order, and efficiency has become an inevitable trend. In early [...] Read more.
Structured light fields carrying orbital angular momentum (OAM) have been widely studied, and a variety of applications have been found. The exploration of the generation of the structured light beams with higher purity, order, and efficiency has become an inevitable trend. In early years, structured light beams are normally generated with the extra-cavity methods, as it is simpler in principle. However, the intra-cavity generation of the structured light has a better beam purity and higher light conversion efficiency. Here, the current advance in the production of structured light directly from lasers based on spatial light modulators (SLMs), metasurfaces, and microrings is reviewed. Full article
(This article belongs to the Special Issue Ultrafast Laser and Micro-Nano Machining)
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