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Advancements in Lasers: Applications and Future Trends
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Advancements in Lasers: Applications and Future Trends

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Laser Coatings".

Deadline for manuscript submissions: 10 July 2025 | Viewed by 3558

Special Issue Editors

Dr. Zhongliang Qiao

E-Mail Website
Guest Editor
Key Laboratory of Laser Technology and Optoelectronic Functional Materials of Hainan Province, School of Physics and Electronic Engineering, Hainan Normal University, Haikou 571158, China
Interests: semiconductor lasers; OFC; integrated optoelectronics; coating
Dr. Zaijin Li

E-Mail Website
Guest Editor
Key Laboratory of Laser Technology and Optoelectronic Functional Materials of Hainan Province, School of Physics and Electronic Engineering, Hainan Normal University, Haikou 571158, China
Interests: film; semiconductor lasers; integrated optoelectronics

Special Issue Information

Dear Colleagues,

Theoretical, experimental and engineering developments in multifunctional coatings as single or multiple layers covering different substrates are the most important research field in semiconductor laser fabrication and optical transmission. This has been spurred primarily by their performance in the demanding environmental conditions required by current applications, ranging from pump sources; optical communication; metasurfaces; and the aerospace, medical, automotive and chemical industries to oil and gas detection technologies. Driven by the current state of knowledge of passivation and strain mechanisms, the need to maintain structural material integrity and reliability assets in harsh environments and a renewed impetus towards the performance of new nanostructured coating systems have created a huge demand for experimental, theoretical, modelling and engineering activities.

The manufacturing, designing, testing, and engineering of high-performance nanostructured materials that are photoelectrically active (e.g., perovskite, metals, graphene, carbon nanotubes, conductive polymers, etc.), capable of serving as physical protection layers (organic polymers, composite materials, ceramic materials, etc.) or both provide unprecedented functionality and opportunities for multifunctional coatings protecting metallic structures (semiconductors, fibres, mirrors and lenses).

This Special Issue will serve as a forum for papers discussing the following concepts:

  • Theoretical, experimental and engineering research, knowledge and new ideas in optoelectronic protective and preventive coating mechanisms.
  • Recent developments in multifunctional organic, inorganic, perovskite and hybrid coatings.
  • Coatings produced by different processes, including but not limited to additive manufacturing processes, thermal spray, laser and plasma processing, CVD, sputtering, Ebeam, etc.
  • Experimenting with and processing high-performance coatings with exposure to high temperatures, high stress, and other extreme environmental conditions.
  • Understanding the degradation mechanisms of coatings through friction, wear or other dynamic loading conditions and passivation techniques.
  • The development of test methods considering the interplay between mechanical, optoelectronic and electrochemical interactions and the ability to predict performance and/or reliability with an emphasis on valid, accelerated performance tests and the relation between test techniques and field performance data.
  • Computer modelling and simulation to predict coating properties, performance, durability and reliability in service environments.
  • Monolithic integration OFC computer modelling and simulations to predict OFC properties and performance.

Dr. Zhongliang Qiao
Dr. Zaijin 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. Coatings 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 2600 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

  • passivation coatings
  • performance modelling
  • reliability coatings
  • damage evolution modelling of coatings
  • OFC

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (4 papers)

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Research

12 pages, 3381 KiB  
Article
An Optical Fiber Ultrasonic Emitter Based on the Thermal Cavitation Effect
by Wenhui Kang, Dongxin Xu, Dongliang Xie, Jianqiang Sheng, Menghao Wu, Qiang Zhao and Yi Qu
Coatings 2025, 15(4), 391; https://doi.org/10.3390/coatings15040391 - 26 Mar 2025
Viewed by 209
Abstract
In this study, we have developed an optical fiber ultrasound emitter based on the thermal cavitation effect. A tube filled with a highly absorptive liquid is sealed at the end of an optical fiber pigtail. A continuous-wave laser is transmitted through the fiber, [...] Read more.
In this study, we have developed an optical fiber ultrasound emitter based on the thermal cavitation effect. A tube filled with a highly absorptive liquid is sealed at the end of an optical fiber pigtail. A continuous-wave laser is transmitted through the fiber, heating the highly absorptive copper salt solution near the fiber end face to its spinodal limit. Using a single-mode fiber, we achieved ultrasound pulses with an amplitude of 330 kPa and a repetition rate of 4 kHz in the frequency range of 5–17 MHz, and a bandwidth of 12 MHz was obtained by using a low laser heating power of 52 mW at a wavelength of 974 nm. This optical fiber ultrasound emitter features a simple fabrication process, low cost, and low optical power consumption. Its flexible design allows for easy integration into medical devices with small dimensions and makes it suitable for non-destructive testing in confined spaces. Full article
(This article belongs to the Special Issue Advancements in Lasers: Applications and Future Trends)
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13 pages, 3010 KiB  
Article
LD-Pumped 228 nm Nd:GdVO4/Cr4+:YAG Passively Q-Switched Solid-State Laser
by Can Xu, Weihan Shen, Ke Hu, Dongxin Xu, Ruozhu Hao, Lixiang Fan, Zhibin Zhao, Zaijin Li, Hao Chen, Zhongliang Qiao and Yi Qu
Coatings 2024, 14(12), 1531; https://doi.org/10.3390/coatings14121531 - 4 Dec 2024
Viewed by 933
Abstract
The 228 nm deep ultraviolet laser, leveraging its advantages of short wavelength, high photon energy, and low thermal effect, can significantly enhance the Raman signal in resonance Raman spectroscopy and demonstrates broad application potential in areas such as precision processing of photonic devices. [...] Read more.
The 228 nm deep ultraviolet laser, leveraging its advantages of short wavelength, high photon energy, and low thermal effect, can significantly enhance the Raman signal in resonance Raman spectroscopy and demonstrates broad application potential in areas such as precision processing of photonic devices. This paper investigates a solid-state linear-cavity passively Q-switched 228 nm deep ultraviolet laser. Firstly, the laser employs an Nd:GdVO4 crystal as the gain medium, combined with Cr4+:YAG crystal passive Q-switching technology to generate 912 nm pulsed fundamental frequency light. Subsequently, a lithium metaborate (LBO) crystal is used to generate 456 nm second-harmonic light, and finally, a barium metaborate (BBO) crystal is utilized to achieve 228 nm fourth-harmonic laser output. In this paper, we investigate the variation in 456 nm and 228 nm laser output power under the cavity length of 63 mm. Ultimately, at a pump power of 41.75 W, the highest average power of 670 mW was achieved for a 456 nm blue laser output with a repetition rate of 12 kHz and a pulse width of 32 ns. Additionally, a maximum average power of 18 mW was obtained for a 228 nm deep ultraviolet laser output, featuring a repetition rate of 12 kHz and a pulse width of 33 ns. Full article
(This article belongs to the Special Issue Advancements in Lasers: Applications and Future Trends)
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10 pages, 2386 KiB  
Article
Narrow-Pulse-Width, Straight-Type-Cavity, All-Solid-State Laser at 228.5 nm
by Weihan Shen, Can Xu, Lixiang Fan, Dongxin Xu, Kangxun Sun, Zhibin Zhao, Zaijin Li, Hao Chen, Zhongliang Qiao and Yi Qu
Coatings 2024, 14(12), 1521; https://doi.org/10.3390/coatings14121521 - 2 Dec 2024
Viewed by 907
Abstract
Deep-ultraviolet (DUV) lasers operating at a wavelength of 228 nm offer distinct advantages in Raman spectroscopy and analysis, demonstrating significant potential in the field of surgical medicine. This paper details the development of a high-repetition-rate, narrow-pulse-width, short-cavity laser system functioning at 228.5 nm, [...] Read more.
Deep-ultraviolet (DUV) lasers operating at a wavelength of 228 nm offer distinct advantages in Raman spectroscopy and analysis, demonstrating significant potential in the field of surgical medicine. This paper details the development of a high-repetition-rate, narrow-pulse-width, short-cavity laser system functioning at 228.5 nm, which is based on Barium Borate (BBO) electro-optic Q-switching. The system utilizes a double-concave resonator structure and a pressure-applied electro-optic Q-switching technique, incorporating Lithium Borate (LBO) and BBO as frequency-doubling crystals. A low-concentration Nd:YVO4 crystal, measuring 4 mm × 4 mm × 5 mm, serves as the gain medium, with a high-reflectivity coating applied to its left end face to function as the total reflection mirror within the resonant cavity. Upon achieving a pump power of 37 W at a repetition rate of 12 kHz, the system produced a maximum average power of 32 mW, with a pulse width varying from 2.48 ns to 2.70 ns and a central wavelength of 228.5 nm, which is effectively applicable for deep-ultraviolet spectral detection. Full article
(This article belongs to the Special Issue Advancements in Lasers: Applications and Future Trends)
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8 pages, 3741 KiB  
Article
Etching Processing of InGaAs/InAlAs Quantum Cascade Laser
by Qi Wu, Yana Zhu, Dongxin Xu, Zaijin Li, Yi Qu, Zhongliang Qiao, Guojun Liu, Zhibin Zhao, Lina Zeng, Hao Chen and Lin Li
Coatings 2024, 14(11), 1448; https://doi.org/10.3390/coatings14111448 - 13 Nov 2024
Cited by 1 | Viewed by 1155
Abstract
The 3–5 μm mid-infrared band is the atmospheric window band, where there are absorption peaks of many molecules. It plays an important role in trace gas detection, directional infrared countermeasures, biomedicine, and free-space optical communications. The wet etching process of the designed InGaAs/InAlAs [...] Read more.
The 3–5 μm mid-infrared band is the atmospheric window band, where there are absorption peaks of many molecules. It plays an important role in trace gas detection, directional infrared countermeasures, biomedicine, and free-space optical communications. The wet etching process of the designed InGaAs/InAlAs quantum cascade laser with superlattice structure was explored to provide a good experimental basis for the research and development of lasers. The HBr:HNO3:H2O series of etching solutions were selected for corrosion experiments, and the surface morphology was observed by scanning electron microscopy (SEM) and metallographic microscopy to obtain the corrosion rate of the etching solution. The experimental results show that the etching liquid ratio is HBr:HNO3:H2O = 1:1:10, and the etching rate is 0.6 μm/min. A quantum cascade laser that works continuously at room temperature was prepared, with an injection strip width of 7 μm, a cavity length of 4mm, and an operating temperature of 20 °C. The device works in continuous mode (CW), with a maximum continuous output power of about 186 mW, a threshold current of about 0.4 A, a threshold current density of about 1.428 kA/cm2, a device center wavelength of about 4424 nm, a side mode suppression ratio of 28 dB, and a spectrum full width at half maximum of 2 nm. Full article
(This article belongs to the Special Issue Advancements in Lasers: Applications and Future Trends)
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