Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
2.6
2.1
Journals
Photonics
Special Issues
Advanced Lasers and Their Applications, 2nd Edition 
share announcement

Advanced Lasers and Their Applications, 2nd Edition 

A special issue of Photonics (ISSN 2304-6732). This special issue belongs to the section "Lasers, Light Sources and Sensors".

Deadline for manuscript submissions: 31 March 2025 | Viewed by 11383

Special Issue Editors

Dr. Song Yang

E-Mail Website
Guest Editor
DTU Electro, Department of Electrical and Photonics Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
Interests: fiber laser; mode-locking; Q-switching; nonlinear optics; nano/micro-fabrication; laser imaging; optical sensor
Special Issues, Collections and Topics in MDPI journals
Dr. Lujun Hong

E-Mail Website
Guest Editor
Institute of Space Science and Technology, Nanchang University, Nanchang 330031, China
Interests: isolator; waveguide; non-reciprocal component; terahertz
Dr. Ling Zhang

E-Mail Website
Guest Editor
Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
Interests: mode-locking; nonlinear optics; low-dimensional material; 3D printing; micro/nano-structure fabrication
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Advanced lasers have revolutionized various fields, ranging from telecommunications to medical surgery, offering unparalleled precision, power, and versatility. These sophisticated devices generate intense beams of coherent light through stimulated emission, where atoms or molecules release photons in synchronization.

One of the key advancements in laser technology is the development of various types of lasers tailored to specific applications. For instance, solid-state lasers, such as Nd:YAG or Ti:sapphire lasers, offer high energy and precise wavelength control, making them ideal for scientific research and medical procedures. Semiconductor lasers, commonly found in DVD players and laser pointers, boast compactness and efficiency, driving innovations in telecommunications and data storage.

We are inviting both research articles and review papers that are related to this fascinating topic. Further information can be found on the Special Issue website. Research areas may include (but are not limited to) the following:

  • Fiber lasers;
  • All-solid-state lasers;
  • Semiconductor lasers;
  • Micro/nano-structure fabrication;
  • Optical sensors.

We look forward to receiving your contributions.

Dr. Song Yang
Dr. Lujun Hong
Dr. Ling 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. 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

  • fiber laser
  • all-solid-state laser
  • semiconductor laser
  • micro/nano-structure fabrication
  • optical sensor

Benefits of Publishing in a Special Issue

  • Ease of navigation: Grouping papers by topic helps scholars navigate broad scope journals more efficiently.
  • Greater discoverability: Special Issues support the reach and impact of scientific research. Articles in Special Issues are more discoverable and cited more frequently.
  • Expansion of research network: Special Issues facilitate connections among authors, fostering scientific collaborations.
  • External promotion: Articles in Special Issues are often promoted through the journal's social media, increasing their visibility.
  • e-Book format: Special Issues with more than 10 articles can be published as dedicated e-books, ensuring wide and rapid dissemination.

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

Related Special Issue

Published Papers (13 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

Jump to: Review

12 pages, 4728 KiB  
Article
A Widely and Continuously Tunable Single-Mode Transmitter Based on a Hybrid Microcavity Laser
by Miao-Qing Wang, Bin Zhang, Zhen-Ning Zhang, You-Zeng Hao, Zun-Hao Hu, Yue-De Yang, Jin-Long Xiao, António L. Teixeira and Yong-Zhen Huang
Photonics 2024, 11(11), 1080; https://doi.org/10.3390/photonics11111080 - 17 Nov 2024
Viewed by 294
Abstract
A method for achieving the single-mode and efficient unidirectional emission of a whispering gallery mode (WGM) semiconductor laser is presented herein. Hybrid square-rectangular lasers (HSRLs) and hybrid square/rhombus-rectangular lasers (HSRRLs) consisting of a Fabry–Pérot (FP) cavity and a square or rhombus cavity microcavity [...] Read more.
A method for achieving the single-mode and efficient unidirectional emission of a whispering gallery mode (WGM) semiconductor laser is presented herein. Hybrid square-rectangular lasers (HSRLs) and hybrid square/rhombus-rectangular lasers (HSRRLs) consisting of a Fabry–Pérot (FP) cavity and a square or rhombus cavity microcavity are described. In addition, a transmitter optical subassembly (TOSA) based on an HSRRL chip was fabricated, which has a wide and continuous wavelength tuning range. Wavelength channels from 1555.75 nm to 1568.15 nm with a spacing of 50 GHz were demonstrated with a good side mode suppression ratio (SMSR) and good output power. These devices have the potential to meet the typical requirements of optical communication networks. Full article
(This article belongs to the Special Issue Advanced Lasers and Their Applications, 2nd Edition )
►▼ Show Figures

Figure 1

10 pages, 674 KiB  
Article
Synchronization Between Kerr Cavity Solitons and Broad Laser Pulse Injection
by Daria A. Dolinina and Andrei G. Vladimirov
Photonics 2024, 11(11), 1050; https://doi.org/10.3390/photonics11111050 - 8 Nov 2024
Viewed by 384
Abstract
The synchronization of a soliton frequency comb in a Kerr cavity with pulsed laser injection is studied numerically. The neutral delay differential equation is used to model the light dynamics in the cavity. This model allows for the investigation of both cases where [...] Read more.
The synchronization of a soliton frequency comb in a Kerr cavity with pulsed laser injection is studied numerically. The neutral delay differential equation is used to model the light dynamics in the cavity. This model allows for the investigation of both cases where the pulse repetition period is close to the cavity round-trip time and where the repetition period of the injection pulses is close to a rational fraction M/N of the round-trip time. It is demonstrated that solitons can exist in this latter case, provided that the injection pulses are of a higher amplitude, which is directly proportional to the number M. Furthermore, it is shown that the synchronization range of the solitons is also proportional to the number M. The solitons excited by pulses with a period slightly different from the M:N-resonance can be destabilized by the Andronov–Hopf bifurcation, which occurs when the injection level at the soliton position decreases to M times the injection amplitude corresponding to the saddle-node bifurcation in a model equation with uniform injection. Full article
(This article belongs to the Special Issue Advanced Lasers and Their Applications, 2nd Edition )
►▼ Show Figures

Figure 1

7 pages, 2532 KiB  
Article
Combined Efficacy of Q-Switched 785 nm Laser and Tranexamic Acid Cream in the Treatment of Melasma: A Prospective Clinical Study
by Elena Zappia, Domenico Piccolo, Chiara Del Re, Paolo Bonan, Luca Guarino, Simone Ribero, Hassan Galadari and Steven Paul Nisticò
Photonics 2024, 11(10), 938; https://doi.org/10.3390/photonics11100938 - 6 Oct 2024
Viewed by 773
Abstract
Background and Objectives: Melasma, a hypermelanotic dermatologic condition that mainly affects women, poses challenges due to its complex etiology involving environmental and genetic factors. Its pathophysiology, marked by intricate histological changes, is not fully understood. This study explored the efficacy and safety [...] Read more.
Background and Objectives: Melasma, a hypermelanotic dermatologic condition that mainly affects women, poses challenges due to its complex etiology involving environmental and genetic factors. Its pathophysiology, marked by intricate histological changes, is not fully understood. This study explored the efficacy and safety of a new 785 nm picosecond laser in treating facial melasma. Materials and Methods: An 11-participant cohort, comprising women with Fitzpatrick phototypes II-III, underwent a treatment protocol with a new 785 nm picosecond laser. The clinical evaluation used the Global Aesthetic International Score (GAIS) and the Five-Point Likert Scale Questionnaire. The aim of the study was to understand the capacity of the 785 nm wavelength laser to interact with both the pigmentary and vascular components of melasma. Results: The GAIS outcomes revealed excellent (18.2%), good (54.5%), poor (18.2%), and no results (9.1%). The Likert Scale responses varied from very satisfied (18.2%) to slightly satisfied (9.1%). Clinical images at three months demonstrated resolution of melasma with no adverse events. Conclusions: This non-invasive procedure showed positive outcomes and high patient tolerance, emphasizing its potential in melasma management. However, in order to fully understand the interactions of pigmentary and vascular components with the 785 nm wavelength laser, further research is required. The small cohort represents a limitation for this study, therefore studies that include a larger number of patients are needed to assess the effectiveness of this laser treatment for facial melasma. Full article
(This article belongs to the Special Issue Advanced Lasers and Their Applications, 2nd Edition )
►▼ Show Figures

Figure 1

15 pages, 5942 KiB  
Article
Numerical Simulation and Experimental Investigation of Single-Point Picosecond Laser Ablation inside K9 Glass
by Zhanfeng Dai, Yang Xu, Yiying Song, Hongzhi He, Bo Liu, Yong He, Guling Zhang and Xuechun Lin
Photonics 2024, 11(8), 699; https://doi.org/10.3390/photonics11080699 - 27 Jul 2024
Viewed by 652
Abstract
K9 glass is a classical transparent material widely used in high-power optical systems due to its high-temperature resistance. However, the precision machining of K9 glass is difficult. The laser processing method, characterized by being non-contact, having a small heat-affected zone, and having high [...] Read more.
K9 glass is a classical transparent material widely used in high-power optical systems due to its high-temperature resistance. However, the precision machining of K9 glass is difficult. The laser processing method, characterized by being non-contact, having a small heat-affected zone, and having high processing precision, is commonly employed for processing intricate structures. In this study, the vector diffraction model is employed to simulate the internal electric field inside the material when focused by objective lenses with varying numerical apertures. Furthermore, the temperature field is simulated. The simulation considered the nonlinear absorption of the material, the stretching of the focal dot due to spherical aberration, and the energy loss of the laser during the focusing process. The experiment indicated that the ablated area consists of numerous small, ablated dots and that multiple ablated areas emerged under an NA of 0.6. This study can provide valuable references for the research of the interaction between lasers and glass materials. Full article
(This article belongs to the Special Issue Advanced Lasers and Their Applications, 2nd Edition )
►▼ Show Figures

Figure 1

10 pages, 4271 KiB  
Communication
Nonlinear Dynamics of Silicon-Based Epitaxial Quantum Dot Lasers under Optical Injection
by Ruilin Fang, Guang-Qiong Xia, Yan-Fei Zheng, Qing-Qing Wang and Zheng-Mao Wu
Photonics 2024, 11(8), 684; https://doi.org/10.3390/photonics11080684 - 23 Jul 2024
Viewed by 776
Abstract
For silicon-based epitaxial quantum dot lasers (QDLs), the mismatches of the lattice constants and the thermal expansion coefficients lead to the generation of threaded dislocations (TDs), which act as the non-radiative recombination centers through the Shockley–Read–Hall (SRH) recombination. Based on a three-level model [...] Read more.
For silicon-based epitaxial quantum dot lasers (QDLs), the mismatches of the lattice constants and the thermal expansion coefficients lead to the generation of threaded dislocations (TDs), which act as the non-radiative recombination centers through the Shockley–Read–Hall (SRH) recombination. Based on a three-level model including the SRH recombination, the nonlinear properties of the silicon-based epitaxial QDLs under optical injection have been investigated theoretically. The simulated results show that, through adjusting the injection parameters including injection strength and frequency detuning, the silicon-based epitaxial QDLs can display rich nonlinear dynamical states such as period one (P1), period two (P2), multi-period (MP), chaos (C), and injection locking (IL). Relatively speaking, for a negative frequency detuning, the evolution of the dynamical state with the injection strength is more abundant, and an evolution path P1-P2-MP-C-MP-IL has been observed. Via mapping the dynamical state in the parameter space of injection strength and frequency detuning under different SRH recombination lifetime, the effects of SRH recombination lifetime on the nonlinear dynamical state of silicon-based epitaxial QDLs have been analyzed. Full article
(This article belongs to the Special Issue Advanced Lasers and Their Applications, 2nd Edition )
►▼ Show Figures

Figure 1

8 pages, 1448 KiB  
Article
Optical Rogue Waves in Fiber Lasers
by Hani J. Kbashi and Sergey V. Sergyev
Photonics 2024, 11(7), 657; https://doi.org/10.3390/photonics11070657 - 12 Jul 2024
Viewed by 908
Abstract
Optical rogue waves are a nonlinear phenomenon that offers a unique opportunity to gain fundamental insights into wave interaction and behavior, and the evolution of complex systems. Optical systems serve as a suitable testbed for the well-controlled investigation of this natural phenomenon, which [...] Read more.
Optical rogue waves are a nonlinear phenomenon that offers a unique opportunity to gain fundamental insights into wave interaction and behavior, and the evolution of complex systems. Optical systems serve as a suitable testbed for the well-controlled investigation of this natural phenomenon, which cannot be easily studied in an ocean environment. Additionally, such systems offer practical applications in telecommunications and optical signal processing, making this topic a vital area of research. Fiber lasers are considered the best candidates for demonstrating and investigating the emergence of optical rogue waves. In particular, they offer significant advantages in nonlinear dynamics due to faster field evolution and a higher number of events that can be recorded within a relatively short time. In this paper, we present the development mechanisms of optical rogue wave events. It was found that multimode vector instability, pulse–pulse interaction, and soliton rain are the main nonlinear dynamics leading to the formation of optical rogue wave events. Full article
(This article belongs to the Special Issue Advanced Lasers and Their Applications, 2nd Edition )
►▼ Show Figures

Figure 1

8 pages, 3159 KiB  
Communication
High-Power GHz Burst-Mode All-Fiber Laser System with Sub 300 fs Pulse Duration
by Feng Li, Wei Zhao, Yuxi Fu, Jixin Xing, Wenlong Wen, Lei Wang, Qianglong Li, Xue Cao, Hualong Zhao and Yishan Wang
Photonics 2024, 11(6), 570; https://doi.org/10.3390/photonics11060570 - 18 Jun 2024
Viewed by 940
Abstract
An all-fiber low-repetition-rate SESAM mode-locked fiber oscillator combined with a dispersion-managed active fiber loop produces a flexible GHz burst-mode laser source. The high-power output is then produced by amplifying the GHz burst-mode laser source using an all-fiber chirped-pulse amplification system. Then, the laser [...] Read more.
An all-fiber low-repetition-rate SESAM mode-locked fiber oscillator combined with a dispersion-managed active fiber loop produces a flexible GHz burst-mode laser source. The high-power output is then produced by amplifying the GHz burst-mode laser source using an all-fiber chirped-pulse amplification system. Then, the laser is compressed using a grating pair compressor; a maximum amplified power of 97 W is obtained. This results in a compressed high power of 82.07 W with a power stability RMS of 0.09% and beam quality better than 1.2. Accurate dispersion control allows for the production of a high-quality pulse duration of 265 fs. Full article
(This article belongs to the Special Issue Advanced Lasers and Their Applications, 2nd Edition )
►▼ Show Figures

Figure 1

11 pages, 3451 KiB  
Article
High-Performance Terahertz Coherent Perfect Absorption with Asymmetric Graphene Metasurface
by Jintao Chen, Lujun Hong, Jiangtao Lei, Yun Shen, Xiaohua Deng, Jing Chen and Tianjing Guo
Photonics 2024, 11(6), 544; https://doi.org/10.3390/photonics11060544 - 7 Jun 2024
Cited by 1 | Viewed by 778
Abstract
In this work, we introduce a novel coherent perfect absorber, accentuating its novelty by emphasizing the broad bandwidth, reduced thickness, tunable property, and straightforward design achieved through the use of an asymmetric graphene metasurface. This design incorporates both square and circular graphene patches [...] Read more.
In this work, we introduce a novel coherent perfect absorber, accentuating its novelty by emphasizing the broad bandwidth, reduced thickness, tunable property, and straightforward design achieved through the use of an asymmetric graphene metasurface. This design incorporates both square and circular graphene patches arranged on either side of a silicon substrate. With an optimized structural design, this absorber consistently captures over 90% of incoming waves across the frequency range of 1.65 to 4.49 THz, with a graphene Fermi level of 0.8 eV, and the whole device measures just 1.5 um thick. This makes our absorber significantly more effective and compact than previous designs. The absorber’s effectiveness can be significantly enhanced by combining the metasurface’s geometric design with the graphene Fermi level. It is anticipated that this ultrathin, wideband coherent perfect absorption device will play a crucial role in emerging on-chip THz communication technologies, including light modulators, photodetectors, and so on. Full article
(This article belongs to the Special Issue Advanced Lasers and Their Applications, 2nd Edition )
►▼ Show Figures

Figure 1

10 pages, 2246 KiB  
Article
Generation of Bright–Dark Pulse Pairs in the Er-Doped Mode-Locked Fiber Laser Based on Doped Fiber Saturable Absorber
by Yaoyao Qi, Qixing Yu, Wei Sun, Yaqing Gao, Yu Zhang, Zhenxu Bai, Jie Ding, Bingzheng Yan, Yulei Wang, Zhiwei Lu and Dapeng Yan
Photonics 2024, 11(6), 534; https://doi.org/10.3390/photonics11060534 - 3 Jun 2024
Cited by 2 | Viewed by 643
Abstract
This study reports new types of passive mode-locked Er-doped fiber laser (EDFL) based on a segment of doped fiber saturable absorber (DFSA) with Tm/Ho-doped fiber (THDF), Yb-doped fiber (YDF), and Er-doped fiber (EDF). By employing THDF-SA, a bright pulse sequence with a fundamental [...] Read more.
This study reports new types of passive mode-locked Er-doped fiber laser (EDFL) based on a segment of doped fiber saturable absorber (DFSA) with Tm/Ho-doped fiber (THDF), Yb-doped fiber (YDF), and Er-doped fiber (EDF). By employing THDF-SA, a bright pulse sequence with a fundamental repetition rate of 17.86 MHz was obtained. In addition, various mode-locked output states, including dark pulses, dark–bright pulse pairs, bright–dark pulse pairs, and second-harmonic pulses, were obtained through polarization modulation and gain modulation, and the orthogonality of dark–bright pulses in both polarization directions was verified. Furthermore, using EDF-SA and YDF-SA, dark pulses and dark–bright pulses were obtained. A comparison of the three experiments revealed that THDF-SA effectively reduces the mode-locked threshold and improves the average output power. Compared with bright pulses, dark pulses offer several advantages such as resisting noise, increasing propagation speed, and suppressing nonlinear scattering (such as pulse-intrinsic Raman scattering); thus, the EDFL can find broad application in long-distance transmission, precision measurement, and other fields. Full article
(This article belongs to the Special Issue Advanced Lasers and Their Applications, 2nd Edition )
►▼ Show Figures

Figure 1

14 pages, 3394 KiB  
Article
High-Performance Fiber Ring Laser Based on Polarization Space Parity-Time Symmetry Breaking
by Fengling Zhang, Zhengmao Wu, Xin Tong and Guangqiong Xia
Photonics 2024, 11(6), 501; https://doi.org/10.3390/photonics11060501 - 25 May 2024
Viewed by 1270
Abstract
This work proposes and experimentally demonstrates a high-performance polarization space parity-time (PT) symmetric fiber ring laser to achieve a low-noise, narrow-linewidth, and highly stable single-longitudinal-mode output. The gain/loss and coupling coefficients are regulated by adjusting a polarization controller (PC) and the pumping current [...] Read more.
This work proposes and experimentally demonstrates a high-performance polarization space parity-time (PT) symmetric fiber ring laser to achieve a low-noise, narrow-linewidth, and highly stable single-longitudinal-mode output. The gain/loss and coupling coefficients are regulated by adjusting a polarization controller (PC) and the pumping current of an erbium-doped fiber amplifier (EDFA) within the ring cavity. The results show that the single longitudinal mode oscillation of the laser can be implemented by PT symmetry breaking. The frequency noise spectral density and the linewidth characteristics of the laser are evaluated by the short-delay self-heterodyne method. The results reveal that excellent low-frequency noise (181 Hz2/Hz at a 10 kHz offset frequency) and narrow fundamental linewidth (68 Hz) can be achieved. Additionally, the laser exhibits outstanding stability with only 0.64 pm wavelength drift over 30 min. By tuning an optical tunable filter (OTF), the wavelength tunable range of the laser can cover the entire C-band. Furthermore, the impacts of different fiber length on the frequency noise spectral density and the filter bandwidth on stability are analyzed, offering guidance for component selection in such laser systems. Full article
(This article belongs to the Special Issue Advanced Lasers and Their Applications, 2nd Edition )
►▼ Show Figures

Figure 1

13 pages, 4516 KiB  
Article
Broadband High-Linear FMCW Light Source Based on Spectral Stitching
by Liang Sun, Xinguang Zhou, Haohao Zhao, Shichang Xu, Zihan Wu, Guohui Yuan and Zhuoran Wang
Photonics 2024, 11(5), 477; https://doi.org/10.3390/photonics11050477 - 19 May 2024
Viewed by 965
Abstract
The key to realizing a high-performance frequency-modulated continuous wave (FMCW) laser frequency-sweeping light source is how to extend the frequency-swept bandwidth and eliminate the effect of nonlinearity. To solve these issues, this paper designs a broadband high-linear FMCW frequency-sweeping light source system based [...] Read more.
The key to realizing a high-performance frequency-modulated continuous wave (FMCW) laser frequency-sweeping light source is how to extend the frequency-swept bandwidth and eliminate the effect of nonlinearity. To solve these issues, this paper designs a broadband high-linear FMCW frequency-sweeping light source system based on the combination of fixed temperature control and digital optoelectronic phase-locked loop (PLL), which controls the temperatures of the two lasers separately and attempts to achieve the coarse spectral stitching based on a time-division multiplexing scheme. Furthermore, we uses the PLL to correct the frequency error more specifically after the coarse stitching, which achieves the spectrum fine stitching and, meanwhile, realizes the nonlinearity correction. The experimental results show that our scheme can successfully achieve bandwidth expansion and nonlinearity correction, and the sweeping bandwidth is twice as much as that of the original single laser. The full-width half-maximum (FWHM) of the FMCW output is reduced from 150 kHz to 6.1 kHz, which exhibits excellent nonlinear correction performance. The relative error of the FMCW ranging system based on this frequency-swept light source is also reduced from 1.628% to 0.673%. Therefore, our frequency-swept light source with excellent performance has a promising application in the FMCW laser ranging system. Full article
(This article belongs to the Special Issue Advanced Lasers and Their Applications, 2nd Edition )
►▼ Show Figures

Figure 1

11 pages, 4572 KiB  
Article
Characterizing Extreme Events in a Fabry–Perot Laser with Optical Feedback
by Shanshan Ge, Yu Huang, Kun Li, Pei Zhou, Penghua Mu, Xin Zhu and Nianqiang Li
Photonics 2024, 11(5), 462; https://doi.org/10.3390/photonics11050462 - 15 May 2024
Viewed by 938
Abstract
The study of extreme events (EEs) in photonics has expanded significantly due to straightforward implementation conditions. EEs have not been discussed systematically, to the best of our knowledge, in the chaotic dynamics of a Fabry–Perot laser with optical feedback, so we address this [...] Read more.
The study of extreme events (EEs) in photonics has expanded significantly due to straightforward implementation conditions. EEs have not been discussed systematically, to the best of our knowledge, in the chaotic dynamics of a Fabry–Perot laser with optical feedback, so we address this in the current contribution. Herein, we not only find EEs in all modes but also divide the EEs in total output into two categories for further discussion. The two types of EEs have similar statistical features to conventional rogue waves. The occurrence probability of EEs undergoes a saturation effect as the feedback strength increases. Additionally, we analyze the influence of feedback strength, feedback delay, and pump current on the probability of EEs defined by two criteria of EEs and find similar trends. We hope that this work contributes to a deep understanding and serves as inspiration for further research into various multimode semiconductor laser systems. Full article
(This article belongs to the Special Issue Advanced Lasers and Their Applications, 2nd Edition )
►▼ Show Figures

Figure 1

Review

Jump to: Research

20 pages, 6113 KiB  
Review
Continuous-Wave Self-Raman Vanadate Lasers Generating Versatile Visible Wavelengths
by Di Li, Chien-Yen Huang, Xiu-Wei Chang, Hsing-Chih Liang and Yung-Fu Chen
Photonics 2024, 11(7), 601; https://doi.org/10.3390/photonics11070601 - 26 Jun 2024
Viewed by 1159
Abstract
In this review, the developments of efficient high-power CW orange-lime-green lasers by using intracavity stimulated Raman Scattering (SRS) in Nd-doped vanadate lasers are systematically discussed. The overall properties of the spontaneous Raman spectra in Nd:YVO4 and Nd:GdVO4 crystals are overviewed. The [...] Read more.
In this review, the developments of efficient high-power CW orange-lime-green lasers by using intracavity stimulated Raman Scattering (SRS) in Nd-doped vanadate lasers are systematically discussed. The overall properties of the spontaneous Raman spectra in Nd:YVO4 and Nd:GdVO4 crystals are overviewed. The critical phase matchings of using the lithium triborate (LBO) crystals for sum frequency generation (SFG) and second harmonic generation (SHG) are thoroughly reviewed. We make a detailed review for achieving the individual green-lime-orange emissions from the self-Raman Nd:YVO4 and Nd:GdVO4 lasers with LBO crystals. The following is to review the dual-wavelength operations of the lime-green and orange-green lasers. Finally, the procedure for generating the triple-wavelength operation of orange-lime-green simultaneous emissions is completely described. The present review is expected to be useful for developing compact, efficient, high-power CW visible lasers for applications including medical treatment, biology, spectroscopy, and remote sensing. Full article
(This article belongs to the Special Issue Advanced Lasers and Their Applications, 2nd Edition )
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-13

Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Laser in Dentistry: New Concepts and Prospects
Authors: Olivia Lili Zhang; John Yun Niu; Ollie Yiru Yu; Iris Xiaosue Yin; Chun Hung Chu*
Affiliation: Faculty of Dentistry, The University of Hong Kong
Abstract: Lasers have been extensively utilised in dentistry, offering benefits regarding diagnosis, preventive procedures, and treatments. This review aims to give an overview of lasers in dental care. Understanding the mechanism of laser-tissue interaction is crucial when choosing suitable lasers for various dental applications. This interaction involves several processes, such as the photothermal effect, which results in tissue heating and coagulation; the photochemical effect, which involves chemical reactions induced by light; photoablation, where tissue is removed through vaporisation; and photodesorption, where the laser mechanically disrupts tissue. Laser can be categorised based on four factors, which are radiation wavelength, active medium, output power, and clinical use. Clinicians often name and use dental laser according to their wavelength, dental lasers range from the ultraviolet to far infrared spectrum, mainly operating within the visible and infrared light spectrum. Lasers can also be classified according to their active medium, including gas, liquid, solid, or semiconductor lasers. Lasers can be classified by their output power. In general, low-power lasers are used for therapeutic purposes such as pain relief and tissue repair, whereas high-power lasers are typically employed for cutting and ablation procedures in dental treatments. Finally, Lasers can be categorised according to their clinical use, targeting to soft tissue like gingivae or hard tissue like teeth. This categorisation is essential when selecting the appropriate laser for a specific dental procedure. In conclusion, dental lasers are versatile tools for various clinical applications from diagnosis to operative treatments, aiding clinicians to deliver up-to-dated dental care in modern dentistry.

Back to TopTop