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Photonics
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Optical Vortex Laser
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Optical Vortex Laser

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

Deadline for manuscript submissions: 28 February 2025 | Viewed by 3594

Special Issue Editor

Dr. Peng Li

E-Mail Website
Guest Editor
Research Center for Physics of 2D Opto-Electronic Materials and Devices, School of Physics and Electronics, Henan University, Kaifeng 475004, China
Interests: light field manipulation and nonlinear optics; laser technology and application

Special Issue Information

Dear Colleagues,

Optical vortex beams bearing phase singularities and carrying orbital angular momentum are attracting more people to study from fundamental and applied perspectives, with investigations into optical microscopy, hyper-entanglement, strong coupling between light and matter, optical trapping and optical spanners, classical and quantum communications, etc. On the basis of the number of phase singularities in optical vortex beams, they can mainly be divided into two categories: on-axis single singularity optical vortex beams and multi-singularity optical vortex beam. The multi-singularity optical vortex beam can be further subdivided into two types: optical vortex arrays and optical vortex lattices.

At present, optical vortex beams are mainly generated through passive and active methods. Compared to the passive method of external cavity mode transformation, the active method has significant advantages in conversion, beam quality (mode purity), and power improvement. This Special Issue aims to present original state-of-the-art research articles dealing with vortex laser generated with active method, including off-axis pumping method, annular pumping method, intracavity spherical aberration method, etc. Specifically, papers are also solicited that deal with vortex lasers coupled to various kinds of nonlinear frequency conversion, such as second harmonic generation, sum-frequency generation, optical parametric oscillation, and Raman processes, and so on. Researchers are invited to submit their contributions to this Special Issue. Topics include, but are not limited to:

  • Scalar vortex laser;
  • Vector vortex laser;
  • Vortex arrays laser;
  • Vortex lattices laser;
  • Raman vortex laser;
  • Intra-cavity frequency-doubled/sum-frequency generation vortex laser;
  • Intra-cavity optical parametric vortex laser;
  • Cascaded-pumped vortex laser;
  • Vortex random fiber laser;
  • Kaleidoscope vortex laser.

Dr. Peng Li
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.

Keywords

  • scalar vortex laser
  • vector vortex laser
  • vortex arrays laser
  • vortex lattices laser
  • raman vortex laser
  • intra-cavity frequency-doubled/sum-frequency generation vortex laser
  • intra-cavity optical parametric vortex laser
  • cascaded-pumped vortex laser
  • vortex random fiber laser
  • kaleidoscope vortex laser

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Published Papers (3 papers)

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Research

12 pages, 8816 KiB  
Article
A Watt-Level, High-Quality LG0,±1 Vortex Beam made from a Nd:YVO4 Laser Pumped by an Annular Beam
by Minghao Guo, Xin Tao, Yueqing Li, Shirui Zhang, Zhenkun Wu, Yuzong Gu and Peng Li
Photonics 2024, 11(9), 843; https://doi.org/10.3390/photonics11090843 - 5 Sep 2024
Viewed by 593
Abstract
In this work, we demonstrate a Watt-level, high-quality Laguerre–Gaussian (LG) LG0±1 vortex mode directly output from an end-pumped Nd:YVO4 laser by using an axicon-based annular pump beam. A theoretical model for the annular beam end-pumped solid-state laser with an LG vortex [...] Read more.
In this work, we demonstrate a Watt-level, high-quality Laguerre–Gaussian (LG) LG0±1 vortex mode directly output from an end-pumped Nd:YVO4 laser by using an axicon-based annular pump beam. A theoretical model for the annular beam end-pumped solid-state laser with an LG vortex mode output was established. Chirality control of the vortex laser was achieved by carefully tilting the output coupler. Watt-level 1064 nm lasers with pure LG0,1/LG0,−1 vortex mode, and the incoherent superposition mode of LG0,1 odd and even petal modes, were achieved successively in our experiments. The intensity profile of the generated pure LG0,1 vortex laser was measured, and it can be well fitted by using the standard expression of the LG0,1 vortex mode. The beam quality of the pure LG0,1 mode is Mx2 = 2.01 and My2 = 2.00 along the x-axis and y-axis, respectively. Our study demonstrates that that axicon-based annular pumping has great potential in developing high-power vortex solid-state lasers with simple and compact structures. Full article
(This article belongs to the Special Issue Optical Vortex Laser)
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12 pages, 4617 KiB  
Article
Generating Optical Vortex Array Laser Beams of Superimposing Hermite–Gaussian Beams with a Dual–Phase Modulation Digital Laser System
by Ly Ly Nguyen Thi, Ko-Fan Tsai and Shu-Chun Chu
Photonics 2024, 11(6), 563; https://doi.org/10.3390/photonics11060563 - 15 Jun 2024
Viewed by 1249
Abstract
This study presents an efficient and practical intra-cavity approach for selectively generating vortex array laser beams employing a dual-phase modulation digital laser system, which has not yet been completed in single-phase modulation digital laser. The stable optical vortex array laser beams were formed [...] Read more.
This study presents an efficient and practical intra-cavity approach for selectively generating vortex array laser beams employing a dual-phase modulation digital laser system, which has not yet been completed in single-phase modulation digital laser. The stable optical vortex array laser beams were formed by superimposing cavity Hermite–Gaussian (HG) eigenmodes. In particular, when the selected cavity HG modes shared the same Gouy phase, the resulting optical vortex beam could preserve its light field pattern, thereby maintaining the optical vortex properties in the near and far fields. Numerical results demonstrated that employing dual-phase modulation could establish optimal boundary conditions for the selection of HG modes within the cavity, successfully generating various vortex array laser beams. The experimental validation of the proposed method confirmed the ability to select optical vortex array lasers solely by controlling the loaded phase of the dual-phase modulation digital laser. These results demonstrate the ability of digital lasers to generate and dynamically control optical vortex array lasers. Full article
(This article belongs to the Special Issue Optical Vortex Laser)
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10 pages, 2466 KiB  
Communication
Study on the Generation of 1.9 μm Mode Superposition Conversion Laser by Double-End Off-Axis Pumping
by Chao Li, Xinyu Chen, Ye Sun, Jingliang Liu and Guangyong Jin
Photonics 2024, 11(3), 210; https://doi.org/10.3390/photonics11030210 - 26 Feb 2024
Viewed by 1057
Abstract
In this paper, the Laguerre–Gaussian (LG) mode superposition is obtained by using the technology of double-end off-axis pumping Tm:YLF crystal, and the LG mode superposition is achieved by combining the extra-cavity conversion method. The impact of changing the off-axis distance on the order [...] Read more.
In this paper, the Laguerre–Gaussian (LG) mode superposition is obtained by using the technology of double-end off-axis pumping Tm:YLF crystal, and the LG mode superposition is achieved by combining the extra-cavity conversion method. The impact of changing the off-axis distance on the order of Hermite–Gaussian (HG) mode and the topological charge of LG mode is studied. The results show that when the off-axis distance of the pump source at both ends is tuned, when the off-axis distance is in the range of 260 μm~845 μm, the single-ended 0~10 order HG mode can be obtained. Subsequently, the mode converter is placed to obtain the LG mode beam, and the double-end simultaneously pumps the crystal to obtain the superimposed LG mode. The tuning off-axis quantity changes the topological charge number. When P = 0, l1=l2, the superimposed LG mode is a single-ring spot, and the vortex beam center’s dark hollow area increases with the topological charge number. When P = 0, l1=−l2, the superimposed LG mode is a petal-like spot. The number of petals differs from the topological charges of two opposite numbers. Finally, in the case of changing the topological charge number of the double-ended LG mode, the output of the vortex array structured beams of the tuning mode order 1.9 μm Tm:YLF is completed in the case of conversion and superposition. Full article
(This article belongs to the Special Issue Optical Vortex Laser)
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