Photonics

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Special Issue Editors

Special Issue Information

Dear Colleagues,

This Special Issue aims to collect the latest advances in both theoretical and experimental research of ultrashort pulse fiber lasers and recent developments in their applications. Authors are invited to submit their recent research results in all fiber laser types working in ultrashort pulse fiber lasers and the application innovations of ultrashort pulse fiber lasers. All theoretical, numerical, and experimental papers are welcomed. The topics of this Special Issue include the following:

Ultrashort pulse fiber lasers, including single- and multi-wavelength operations, wavelength-switching, pulse suppression, and optical field modulation;
Ultrashort pulse fiber lasers, including special intensity-modulation techniques, new materials used as saturable absorbers for ultrashort pulse fiber lasers, and high-pulse energy or high-peak power pulse laser output;
Nonlinear dynamic properties in pulsed fiber lasers, and dynamic properties of optical solutions in ultrashort pulse fiber lasers;
Ultra-broadband/ultra-short laser generation and amplification;
High average-power laser technology.

Dr. Baole Lu
Dr. Xiaohui Li
Guest Editors

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.

Keywords

Q-switching
mode-locking
tunable wavelength
nonlinear dynamics
optical field modulation

Published Papers (3 papers)

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Research

Jump to: Review

14 pages, 3686 KiB

Open AccessArticle

Fabrication of Micro/Nano Dual Needle Structures with Morphological Gradient Based on Two-Photon Polymerization Laser Direct Writing with Proactive Focus Compensation

by Chenxi Xu, Chen Zhang, Wei Zhao, Yining Liu, Ziyu Li, Zeyu Wang, Baole Lu, Kaige Wang and Jintao Bai

Photonics 2024, 11(2), 187; https://doi.org/10.3390/photonics11020187 - 18 Feb 2024

Viewed by 834

Abstract

Micro/nano structures with morphological gradients possess unique physical properties and significant applications in various research domains. This study proposes a straightforward and precise method for fabricating micro/nano structures with morphological gradients utilizing single-voxel synchronous control and a nano-piezoelectric translation stage in a two-photon laser direct writing technique. To address the defocusing issue in large-scale fabrication, a methodology for laser focus dynamic proactive compensation was developed based on fluorescence image analysis, which can achieve high-precision compensation of laser focus within the entire range of the nano-piezoelectric translation stage. Subsequently, the fabrication of micro/nano dual needle structures with morphological gradients were implemented by employing different writing speeds and voxel positions. The minimum height of the tip in the dual needle structure is 80 nm, with a linewidth of 171 nm, and a dual needle total length reaching 200 μm. Based on SEM (scanning electron microscope) and AFM (atomic force microscope) characterization, the dual needle structures fabricated by the method proposed in this study exhibit high symmetry and nanoscale gradient accuracy. Additionally, the fabrication of hexagonal lattice periodic structures assembled from morphological gradient needle structures and the size gradient Archimedean spiral structures validate the capability of the single voxel-based fabrication and proactive focus compensation method for complex gradient structure fabrication. Full article

(This article belongs to the Special Issue New Advances in Ultrashort Pulse Fiber Lasers and Their Applications)

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9 pages, 2427 KiB

Open AccessCommunication

C- and L-Bands Wavelength-Tunable Mode-Locked Fiber Laser

by Jiajing Lang, Cheng Chen, Pu Zhang, Mei Qi and Haowei Chen

Photonics 2023, 10(12), 1379; https://doi.org/10.3390/photonics10121379 - 14 Dec 2023

Cited by 1 | Viewed by 1133

Abstract

We report a single-wavelength tunable mode-locked fiber laser. The single wavelength can be tuned from 1537.49 nm to 1608.06 nm by introducing a Sagnac loop filter. As far as we know, this is the widest single-wavelength tuning range achieved in an erbium-doped mode-locked all-fiber laser based on nonlinear amplifying loop mirror (NALM). The laser’s pulse width changes from 549 fs to 808 fs throughout the tuning process, the maximum average output power is 5.72 mW, and the single-pulse energy is 0.34 nJ at a central wavelength of 1556.53 nm. This laser source can serve as an efficient tool for applications that require a broad tunability range. The combination of femtosecond pulses and extensive wavelength tuning capabilities makes this laser system highly valuable in fields such as fiber optic communications, spectroscopy, sensing, and other applications that benefit from ultrafast and tunable laser sources. Full article

(This article belongs to the Special Issue New Advances in Ultrashort Pulse Fiber Lasers and Their Applications)

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Review

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25 pages, 19395 KiB

Open AccessReview

Femtosecond Laser Microfabrication of Artificial Compound Eyes

by Fan Zhang, Huacheng Xu, Qing Yang, Yu Lu, Guangqing Du and Feng Chen

Photonics 2024, 11(3), 264; https://doi.org/10.3390/photonics11030264 - 14 Mar 2024

Viewed by 941

Abstract

Over millions of years of evolution, arthropods have intricately developed and fine-tuned their highly sophisticated compound eye visual systems, serving as a valuable source of inspiration for human emulation and tracking. Femtosecond laser processing technology has attracted attention for its excellent precision, programmable design capabilities, and advanced three-dimensional processing characteristics, especially in the production of artificial bionic compound eye structures, showing unparalleled advantages. This comprehensive review initiates with a succinct introduction to the operational principles of biological compound eyes, providing essential context for the design of biomimetic counterparts. It subsequently offers a concise overview of crucial manufacturing methods for biomimetic compound eye structures. In addition, the application of femtosecond laser technology in the production of biomimetic compound eyes is also briefly introduced. The review concludes by highlighting the current challenges and presenting a forward-looking perspective on the future of this evolving field. Full article

(This article belongs to the Special Issue New Advances in Ultrashort Pulse Fiber Lasers and Their Applications)

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