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Crystals
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Advanced Laser Technology and Applications
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Advanced Laser Technology and Applications

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: closed (26 August 2022) | Viewed by 12904

Special Issue Editors

Prof. Dr. Jingsong Li

E-Mail Website
Guest Editor
Laser Spectroscopy and Sensing Laboratory, Anhui University, Hefei 230601, China
Interests: laser spectroscopy; optical sensing; signal processing algorithm
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Qingli Zhang

E-Mail Website
Guest Editor
The Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
Interests: laser crystal; scintillator; optical material
Prof. Dr. Zhirong Zhang

E-Mail Website
Guest Editor
Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
Interests: spectroscopy; laser techniques; optical fiber sensing; photoelectric measurement; optics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The invention of the laser has enabled mankind to master a powerful light source and tool, significantly promoting our scientific and technological progress, as well as illuminating our lives. To commemorate the 60th anniversary of the birth of the laser, we would like to invite famous young and middle-aged experts who are active in the front line of scientific research to present their latest work, including laser research and progress, laser materials, laser beam characteristics, laser manufacturing, laser technology and applications, large scientific laser devices, etc., to demonstrate the latest development, progress and future trends of lasers and the related fields. 

This Special Issue aims at gathering scientific contributions focused on the current state of the art of lasers, laser techniques and on valuable advances in the design, fabrication, characterization, and application of novel lasers.

Prof. Jingsong Li
Prof. Dr. Qingli Zhang
Prof. Zhirong Zhang
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. Crystals 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

  • Laser sources
  • Laser devices and materials
  • Laser techniques
  • Laser processing
  • Laser spectroscopy
  • Laser sensing
  • Laser communication
  • Laser storage
  • Laser printing
  • Laser-based sensors

Published Papers (5 papers)

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Research

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16 pages, 8506 KiB  
Article
Study on the Surface Morphology of Micro-Particles and the Oxide Layer on Silicon Carbide Crystal Using Nanosecond Green Laser Cleaning Assisted with Airflow
by Haibing Xiao, Chenlin Du, Songling Zhang and Yixin Zhu
Crystals 2022, 12(12), 1788; https://doi.org/10.3390/cryst12121788 - 08 Dec 2022
Cited by 3 | Viewed by 1439
Abstract
With a focus on the particle pollutants on the surface of silicon carbide crystal materials, this paper establishes a laser cleaning model for the fine particles found in silicon carbide crystal materials and proposes a new nanosecond green laser cleaning method assisted by [...] Read more.
With a focus on the particle pollutants on the surface of silicon carbide crystal materials, this paper establishes a laser cleaning model for the fine particles found in silicon carbide crystal materials and proposes a new nanosecond green laser cleaning method assisted by airflow, which can effectively remove microparticles and the oxide layer on the substrate surface. Abaqus software and ANSYS Fluent software were used to simulate changes in the cleaning temperature field and the distribution of particles and dust during cleaning simulation, respectively. Based on the experimental research, and by using a nanosecond green laser to produce a wavelength of 532 nm, the direct irradiation of a nanosecond green laser on the surface of the element, and the particle contaminants on the surface of the silicon carbide material, optimized the process parameters to achieve a better cleaning efficiency. A green laser was used as a light source to conduct experiments to control the wind force of the gas chamber. The influence of the laser energy, scanning speed, and other parameters on the final cleaning efficiency was studied. The parameters of the silicon carbide before and after cleaning were characterized. The research shows that laser cleaning assisted with airflow is an efficient cleaning method that can be used to clean microparticles without damaging silicon carbide crystal substrate and to reduce the surface roughness of silicon carbide material from 1.63 to 0.34 μm, with an airflow of 0.2 Mpa. Full article
(This article belongs to the Special Issue Advanced Laser Technology and Applications)
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15 pages, 6618 KiB  
Article
A Numerical Simulation and Experimental Study on the Ultrafast Double-Laser Precision Cutting of Sapphire Materials
by Haibing Xiao, Wei Zhang, Yongquan Zhou, Mingjun Liu and Guiyao Zhou
Crystals 2022, 12(6), 867; https://doi.org/10.3390/cryst12060867 - 19 Jun 2022
Cited by 3 | Viewed by 2027
Abstract
To effectively improve the cutting quality of sapphire and optimize ultrafast picosecond laser cutting technology, this paper presents a new numerical simulation method and an experimental study of the ultrafast double-laser cutting of sapphire materials. The optimal cutting technology and the numerical simulation [...] Read more.
To effectively improve the cutting quality of sapphire and optimize ultrafast picosecond laser cutting technology, this paper presents a new numerical simulation method and an experimental study of the ultrafast double-laser cutting of sapphire materials. The optimal cutting technology and the numerical simulation of the temperature field of the ultrafast picosecond laser cutting of sapphire were designed independently. The principle is based on double-laser-beam cutting using an ultrashort pulse and a CO2 beam; the ultrashort pulse is focused on the material through a laser filamentous cutting head and perforated, and it moves at a speed of up to 200 mm/s to form the desired cutting line. Then, a CO2 beam is used for heating, and the principle of heat bilges and cold shrink causes the rapid separation of products. Furthermore, an SEM tester was used to characterize and analyze the microstructure and properties of sapphire materials. A microscope was used to analyze the composition of the cutting micro-area and explore the general mechanism of laser cutting sapphire. The results showed that the proposed method greatly improves efficiency and precision; in addition, the chipping size of sapphire is less than 4 μm. Full article
(This article belongs to the Special Issue Advanced Laser Technology and Applications)
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15 pages, 1305 KiB  
Article
A Theoretical Investigation about Photoswitching of Azobenzene Adsorbed on Ag Nanoparticles
by Jin Sun, Zongling Ding, Yuanqin Yu and Chuanmei Xie
Crystals 2022, 12(2), 248; https://doi.org/10.3390/cryst12020248 - 11 Feb 2022
Cited by 1 | Viewed by 1416
Abstract
The optical properties of hybrid systems composed of silver nanoparticles (NPs) and azobenzene molecules were systematically investigated by combining the real-time time-dependent density functional theory (RT-TDDFT) approach with the classical electrodynamics finite difference time domain (FDTD) technique for the solution of Maxwell’s equations. [...] Read more.
The optical properties of hybrid systems composed of silver nanoparticles (NPs) and azobenzene molecules were systematically investigated by combining the real-time time-dependent density functional theory (RT-TDDFT) approach with the classical electrodynamics finite difference time domain (FDTD) technique for the solution of Maxwell’s equations. In order to reflect the chemical interaction between azobenzene and metal more exactly, except for adsorbed molecules, a Ag cluster separated from NP was also dealt, using RT-TDDFT. We studied the different factors affecting the surface-enhanced absorption spectra. It was found that the electric field amplified by plasmon resonance of Ag NPs can have an overall enhancement to the molecular light absorption throughout the whole energy range. The resonance between the electron and the plasmon excitation results in a larger percentage of enhancement in the absorption spectrum the closer the resonance peak is. The enhancement ratio of the resonance peak is the largest. The plasmon–exciton coupling and the optical properties of different isolate isomers influence the line shape of the absorption spectra. The dipole interaction and electronic transfer between azobenzene molecules and Ag NPs also change the shape of spectroscopy from the absorption enhancement ratio and the location of the peak. Physical and chemical factors lead to photoswitching in these hybrid systems together. Full article
(This article belongs to the Special Issue Advanced Laser Technology and Applications)
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10 pages, 2408 KiB  
Article
Research on Shock Acceleration Limit of an Ultra-Stable Optical Cavity for Space Applications Based on the Finite Element Methodology
by Guanjun Xu, Dongdong Jiao, Long Chen, Linbo Zhang, Jun Liu, Ruifang Dong, Tao Liu and Junbiao Wang
Crystals 2021, 11(8), 998; https://doi.org/10.3390/cryst11080998 - 22 Aug 2021
Cited by 1 | Viewed by 1712
Abstract
Ultra-stable optical cavities (USOCs) as fragile precision instruments have many important applications in space. In order to protect them from being damaged during a rocket launch, we analyzed a USOC by means of finite element methodology. The shock acceleration limits that the USOC [...] Read more.
Ultra-stable optical cavities (USOCs) as fragile precision instruments have many important applications in space. In order to protect them from being damaged during a rocket launch, we analyzed a USOC by means of finite element methodology. The shock acceleration limits that the USOC can withstand in different directions and under various conditions are given. To increase the shock acceleration limit, the midplane thickness and the fixed hole diameter should be selected to be as high as possible. It is worth noting that the launch direction of the USOC should be selected as the horizontal direction, for which the shock acceleration limit that the USOC can withstand is approximately two times that of the vertical direction. In this paper, results provide guidance for the design of USOCs for space applications, especially the design to prevent the damage caused by a shock. The method could then be applied to other space optical cavities, providing a tool to improve the effect of shock at high accelerations. Full article
(This article belongs to the Special Issue Advanced Laser Technology and Applications)
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Review

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18 pages, 3542 KiB  
Review
Advances of Yb:CALGO Laser Crystals
by Hao Wang, Jing Pan, Yuan Meng, Qiang Liu and Yijie Shen
Crystals 2021, 11(9), 1131; https://doi.org/10.3390/cryst11091131 - 17 Sep 2021
Cited by 10 | Viewed by 5004
Abstract
Yb:CaGdAlO4, or Yb:CALGO, a new laser crystal, has been attracting increasing attention recently in a myriad of laser technologies. This crystal features salient thermal, spectroscopic and mechanical properties, which enable highly efficient and safe generation of continuous-wave radiations and ultrafast pulses [...] Read more.
Yb:CaGdAlO4, or Yb:CALGO, a new laser crystal, has been attracting increasing attention recently in a myriad of laser technologies. This crystal features salient thermal, spectroscopic and mechanical properties, which enable highly efficient and safe generation of continuous-wave radiations and ultrafast pulses with ever short durations. More specifically, its remarkable thermal-optic property and its high conversion efficiency allow high-power operation. Its high nonlinear coefficient facilitates study of optimized mode locking lasers. Besides, its ultrabroad and flat-top emission band benefits the generation of complex structured light with outstanding tunability. In this paper, we review the recent advances in the study of Yb:CALGO, covering its physical properties as well as its growing applications in various fields and prospect for future development. Full article
(This article belongs to the Special Issue Advanced Laser Technology and Applications)
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